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# Bulls and cows

Bulls and cows
You are encouraged to solve this task according to the task description, using any language you may know.
Bulls and Cows   is an old game played with pencil and paper that was later implemented using computers.

Task

Create a four digit random number from the digits   1   to   9,   without duplication.

The program should:

•   ask for guesses to this number
•   reject guesses that are malformed
•   print the score for the guess

The score is computed as:

1. The player wins if the guess is the same as the randomly chosen number, and the program ends.
2. A score of one bull is accumulated for each digit in the guess that equals the corresponding digit in the randomly chosen initial number.
3. A score of one cow is accumulated for each digit in the guess that also appears in the randomly chosen number, but in the wrong position.

Related tasks

## 8080 Assembly

This is written to run under CP/M and includes an RNG to generate the secret.

bdos		equ	5putchar		equ	2rawio		equ	6puts		equ	9cstat		equ	11reads		equ	10 		org	100h		mvi	c,puts		lxi	d,signon	; Print name		call	bdos		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Initialize the RNG with keyboard input		mvi	c,puts		lxi	d,entropy	; Ask for randomness		call	bdos		mvi	b,9		; 9 times,randloop:	mvi	c,3		; read 3 keys.		lxi	h,xabcdat + 1randkey:	push	b		; Read a key		push	hrandkeywait:	mvi	c,rawio		mvi	e,0FFh		call	bdos		ana	a		jz	randkeywait		pop	h		pop	b		xra	m		; XOR it with the random memory		mov	m,a		inx	h		dcr	c		jnz	randkey		; Go get more characters		dcr	b		jnz	randloop		mvi	c,puts		lxi 	d,done		; Tell the user we're done		call	bdos		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Generate 4-digit secret code		lxi	h,secret		mvi	b,4gencode:	push	h		push	b		call	randcode		pop	b		pop	h		mov	m,a		inx	h		dcr	b		jnz	gencode		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; User makes a guess		readguess:	mvi	c,puts		; Ask for guess		lxi	d,guess		call	bdos		mvi	c,reads		; Read guess		lxi	d,bufdef		call	bdos		call	newline		; Print newline		mvi	b,4		; Check input		lxi	h,bufvalidate:	mov	a,m		cpi	'9' + 1		; >9?		jnc	inval		; = invalid		cpi	'1'		; <1?		jc	inval		; = invalid		sui	'0'		; Make ASCII digit into number		mov	m,a		inx	h		dcr	b		jnz	validate		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Count bulls		mvi	c,puts				lxi	d,bulls		; Output "Bulls:"		call	bdos		lxi	d,secret		lxi	h,buf		lxi	b,4		; No bulls, counter = 4bullloop:	ldax	d		; Get secret digit		cmp	m		; Match to buffer digit		cz	countmatch		inx	h		inx	d		dcr	c		jnz	bullloop		push	b		; Keep bulls for cow count,		push	b		; and for final check.		call	printcount		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Count cows		mvi	c,puts		lxi	d,cows		; Output ", Cows:"		call	bdos		pop	psw		; Retrieve the bulls (into A reg)		cma			; Negate amount of bulls		inr	a		mov	b,a		; Use it as start of cow count		mvi	d,4		; For all 4 secret digits..		lxi	h,secret	cowouter:	mov	a,m		; Grab secret digit to test		push	h		; Store secret position		mvi	e,4		; For all 4 input digits...		lxi	h,bufcowinner:	cmp	m		; Compare to current secret digit		cz	countmatch		inx	h		dcr	e		; While there are more digits in buf		jnz	cowinner	; Test next digit		pop	h		; Restore secret position		inx	h		; Look at next secret digit		dcr	d		; While there are digits left		jnz	cowouter		push	b		; Keep cow count		call	printcount		call	newline		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Check win condition		pop	psw		; Cow count (in A)		pop	b		; Bull count (in B)		ana	a		; To win, there must be 0 cows...		jnz	readguess		mvi	a,4		; And 4 bulls.		cmp	b		jnz	readguess		mvi	c,puts		lxi	d,win		jmp	bdos		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Increment bull/cow countercountmatch:	inr	b		ret		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Print a newlinenewline:	mvi	c,puts		lxi	d,nl		jmp 	bdos		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Output counter as ASCIIprintcount:	mvi	a,'0'		add	b		mvi	c,putchar		mov	e,a		jmp	bdos		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; User entered invalid inputinval:		mvi	c,puts		lxi	d,invalid		call	bdos		jmp	readguess		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Generate random number 1-9 that isn't in keyrandcode:	call	xabcrand		ani	0fh	; Low nybble		ana	a	; 0 = invalid		jz	randcode		cpi	10	; >9 = invalid		jnc	randcode		;; Check if it is a duplicate		mvi	b,4 		lxi	h,secretcheckdup:	cmp	m 		jz	randcode		inx	h		dcr	b		jnz	checkdup		ret 		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; The "X ABC" 8-bit random number generator		;; (Google that to find where it came from)xabcrand:       lxi     h,xabcdat                inr     m       ; X++                mov     a,m     ; X,                inx     h       ;                xra     m       ; ^ C,                inx     h       ;                xra     m       ; ^ A,                mov     m,a     ; -> A                inx     h                add     m       ; + B,                mov     m,a     ; -> B                rar             ; >>1                 dcx     h                xra     m       ; ^ A,                dcx     h                add     m       ; + C                mov     m,a     ; -> C                ret		;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;		;; Strings signon:		db	'Bulls and Cows',13,10,'$'entropy: db 'Please mash the keyboard to generate entropy...$'done:		db	'done.',13,10,13,10,'$'bulls: db 'Bulls:$'cows:		db	', Cows: $'guess: db 'Guess:$'invalid: 	db	'Invalid input.',13,10,'$'win: db 'You win!',13,10,'$'nl:		db	13,10,'$' ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; Variablesxabcdat: ds 4 ; RNG statesecret: ds 4 ; Holds the secret codebufdef: db 4,0 ; User input buffer buf: ds 4 ## Ada with Ada.Text_IO; use Ada.Text_IO;with Ada.Numerics.Discrete_Random; procedure Bulls_And_Cows is package Random_Natural is new Ada.Numerics.Discrete_Random (Natural); Number : String (1..4);begin declare -- Generation of number use Random_Natural; Digit : String := "123456789"; Size : Positive := 9; Dice : Generator; Position : Natural; begin Reset (Dice); for I in Number'Range loop Position := Random (Dice) mod Size + 1; Number (I) := Digit (Position); Digit (Position..Size - 1) := Digit (Position + 1..Size); Size := Size - 1; end loop; end; loop -- Guessing loop Put ("Enter four digits:"); declare Guess : String := Get_Line; Bulls : Natural := 0; Cows : Natural := 0; begin if Guess'Length /= 4 then raise Data_Error; end if; for I in Guess'Range loop for J in Number'Range loop if Guess (I) not in '1'..'9' or else (I < J and then Guess (I) = Guess (J)) then raise Data_Error; end if; if Number (I) = Guess (J) then if I = J then Bulls := Bulls + 1; else Cows := Cows + 1; end if; end if; end loop; end loop; exit when Bulls = 4; Put_Line (Integer'Image (Bulls) & " bulls," & Integer'Image (Cows) & " cows"); exception when Data_Error => Put_Line ("You should enter four different digits 1..9"); end; end loop;end Bulls_And_Cows; ## ALGOL 68 Translation of: Python Works with: ALGOL 68 version Revision 1 - no extensions to language used Works with: ALGOL 68G version Any - tested with release 1.18.0-9h.tiny Works with: ELLA ALGOL 68 version Any (with appropriate job cards) - tested with release 1.8-8d STRING digits = "123456789"; CHAR chosen;STRING available := digits;FOR i TO UPB chosen DO INT c = ENTIER(random*UPB available)+1; chosen[i] := available[c]; available := available[:c-1]+available[c+1:]OD; COMMENT print((chosen, new line)); # Debug # END COMMENT OP D = (INT d)STRING: whole(d,0); # for formatting an integer # print (("I have chosen a number from ",D UPB chosen," unique digits from 1 to 9 arranged in a random order.", new line,"You need to input a ",D UPB chosen," digit, unique digit number as a guess at what I have chosen", new line)); PRIO WITHIN = 5, NOTWITHIN = 5;OP WITHIN = (CHAR c, []CHAR s)BOOL: char in string(c,LOC INT,s);OP NOTWITHIN = (CHAR c, []CHAR s)BOOL: NOT ( c WITHIN s ); INT guesses := 0, bulls, cows;WHILE STRING guess; guesses +:= 1; WHILE # get a good guess # print((new line,"Next guess [",D guesses,"]: ")); read((guess, new line)); IF UPB guess NE UPB chosen THEN FALSE ELSE BOOL ok; FOR i TO UPB guess WHILE ok := guess[i] WITHIN digits AND guess[i] NOTWITHIN guess[i+1:] DO SKIP OD; NOT ok FI DO print(("Problem, try again. You need to enter ",D UPB chosen," unique digits from 1 to 9", new line)) OD;# WHILE # guess NE chosenDO bulls := cows := 0; FOR i TO UPB chosen DO IF guess[i] = chosen[i] THEN bulls +:= 1 ELIF guess[i] WITHIN chosen THEN cows +:= 1 FI OD; print((" ",D bulls," Bulls",new line," ",D cows," Cows"))OD;print((new line, "Congratulations you guessed correctly in ",D guesses," attempts.",new line)) Output: I have chosen a number from 4 unique digits from 1 to 9 arranged in a random order. You need to input a 4 digit, unique digit number as a guess at what I have chosen Next guess :  ## APL Works with: Dyalog APL Call the moo function with one dummy argument to play a game of Bulls and Cows in the APL session. input ← {⍞←'Guess: ' ⋄ 7↓⍞}output ← {⎕←(↑'Bulls: ' 'Cows: '),⍕⍪⍵ ⋄ ⍵}isdigits← ∧/⎕D∊⍨⊢valid ← isdigits∧4=≢guess ← ⍎¨input⍣(valid⊣)bulls ← +/=cows ← +/∊∧≠game ← (output ⊣(bulls,cows) guess)⍣(4 0≡⊣)random ← 4∘⊣?9∘⊣moo ← 'You win!'⊣(random game⊢)  To show off APL, this is written entirely in tacit style (except for the I/O). There is no explicit flow control or recursion, and there are no variables. The code is split into functions only to aid the reader, none is ever referred to twice. The following definition of moo is exactly equivalent to the above: moo←'You win!'⊣((4∘⊣?9∘⊣)(({⎕←(↑'Bulls: ' 'Cows: '),⍕⍪⍵⋄⍵}⊣((+/=),(+/∊∧≠))(⍎¨{⍞←'Guess: '⋄7↓⍞}⍣(((∧/⎕D∊⍨⊢)∧4=≢)⊣)))⍣(4 0≡⊣))⊢) ## AppleScript GUI implementation; the prompt for a guess includes a list of all past guesses and their scores. on pickNumber() set theNumber to "" repeat 4 times set theDigit to (random number from 1 to 9) as string repeat while (offset of theDigit in theNumber) > 0 set theDigit to (random number from 1 to 9) as string end repeat set theNumber to theNumber & theDigit end repeatend pickNumber to bulls of theGuess given key:theKey set bullCount to 0 repeat with theIndex from 1 to 4 if text theIndex of theGuess = text theIndex of theKey then set bullCount to bullCount + 1 end if end repeat return bullCountend bulls to cows of theGuess given key:theKey, bulls:bullCount set cowCount to -bullCount repeat with theIndex from 1 to 4 if (offset of (text theIndex of theKey) in theGuess) > 0 then set cowCount to cowCount + 1 end if end repeat return cowCountend cows to score of theGuess given key:theKey set bullCount to bulls of theGuess given key:theKey set cowCount to cows of theGuess given key:theKey, bulls:bullCount return {bulls:bullCount, cows:cowCount}end score on run set theNumber to pickNumber() set pastGuesses to {} repeat set theMessage to "" repeat with aGuess in pastGuesses set {theGuess, theResult} to aGuess set theMessage to theMessage & theGuess & ":" & bulls of theResult & "B, " & cows of theResult & "C" & linefeed end repeat set theMessage to theMessage & linefeed & "Enter guess:" set theGuess to text returned of (display dialog theMessage with title "Bulls and Cows" default answer "") set theScore to score of theGuess given key:theNumber if bulls of theScore is 4 then display dialog "Correct! Found the secret in " & ((length of pastGuesses) + 1) & " guesses!" exit repeat else set end of pastGuesses to {theGuess, theScore} end if end repeatend run ## Arturo rand: first.n: 4 unique map 1..10 => [sample 0..9]bulls: 0 while [bulls <> 4][ bulls: new 0 cows: new 0 got: strip input "make a guess: " if? or? not? numeric? got 4 <> size got -> print "Malformed answer. Try again!" else [ loop.with:'i split got 'digit [ if? (to :integer digit) = rand \ i -> inc 'bulls else [ if contains? rand to :integer digit -> inc 'cows ] ] print ["Bulls:" bulls "Cows:" cows "\n"] ]]print color.green "** Well done! You made the right guess!!" ## AutoHotkey length:=4, Code:="" ; settings While StrLen(Code) < length { Random, num, 1, 9 If !InStr(Code, num) Code .= num}Gui, Add, Text, w83 vInfo, I'm thinking of a %length%-digit number with no duplicate digits.Gui, Add, Edit, wp vGuess, Enter a guess...Gui, Add, Button, wp Default vDefault, SubmitGui, Add, Edit, ym w130 r8 vHistory ReadOnlyGui, ShowReturn ButtonSubmit: If Default = Restart Reload Gui, Submit, NoHide If (StrLen(Guess) != length) GuiControl, , Info, Enter a %length%-digit number. Else If Guess is not digit GuiControl, , Info, Enter a %length%-digit number. Else { GuiControl, , Info GuiControl, , Guess If (Guess = Code) { GuiControl, , Info, Correct! GuiControl, , Default, Restart Default = Restart } response := Response(Guess, Code) Bulls := SubStr(response, 1, InStr(response,",")-1) Cows := SubStr(response, InStr(response,",")+1) GuiControl, , History, % History . Guess ": " Bulls " Bulls " Cows " Cowsn" }Return GuiEscape:GuiClose: ExitApp Response(Guess,Code) { Bulls := 0, Cows := 0 Loop, % StrLen(Code) If (SubStr(Guess, A_Index, 1) = SubStr(Code, A_Index, 1)) Bulls++ Else If (InStr(Code, SubStr(Guess, A_Index, 1))) Cows++ Return Bulls "," Cows} ## AWK # Usage: GAWK -f BULLS_AND_COWS.AWKBEGIN { srand() secret = "" for (i = 1; i <= 4; ) { digit = int(9 * rand()) + 1 if (index(secret, digit) == 0) { secret = secret digit i++ } } print "Welcome to 'Bulls and Cows'!" print "I thought of a 4-digit number." print "Please enter your guess."}iswellformed($0) {    if (calcscore($0, secret)) { exit }}function iswellformed(number, i, digit) { if (number !~ /[1-9][1-9][1-9][1-9]/) { print "Your guess should contain 4 digits, each from 1 to 9. Try again!" return 0 } for (i = 1; i <= 3; i++) { digit = substr(number, 1, 1) number = substr(number, 2) if (index(number, digit) != 0) { print "Your guess contains a digit twice. Try again!" return 0 } } return 1}function calcscore(guess, secret, bulls, cows, i, idx) { # Bulls = correct digits at the right position # Cows = correct digits at the wrong position for (i = 1; i <= 4; i++) { idx = index(secret, substr(guess, i, 1)) if (idx == i) { bulls++ } else if (idx > 0) { cows++ } } printf("Your score for this guess: Bulls = %d, Cows = %d.", bulls, cows) if (bulls < 4) { printf(" Try again!\n") } else { printf("\nCongratulations, you win!\n") } return bulls == 4} Output: Welcome to 'Bulls and Cows'! I thought of a 4-digit number. Please enter your guess. 1234 Your score for this guess: Bulls = 0, Cows = 1. Try again! 5678 Your score for this guess: Bulls = 1, Cows = 1. Try again! 9651 Your score for this guess: Bulls = 1, Cows = 1. Try again! 5729 Your score for this guess: Bulls = 0, Cows = 3. Try again! 2695 Your score for this guess: Bulls = 2, Cows = 1. Try again! 2697 Your score for this guess: Bulls = 2, Cows = 2. Try again! 7692 Your score for this guess: Bulls = 4, Cows = 0. Congratulations, you win!  ## BASIC Works with: QBasic DEFINT A-Z DIM secret AS STRINGDIM guess AS STRINGDIM c AS STRINGDIM bulls, cows, guesses, i RANDOMIZE TIMERDO WHILE LEN(secret) < 4 c = CHR$(INT(RND * 10) + 48)    IF INSTR(secret, c) = 0 THEN secret = secret + cLOOP guesses = 0DO    INPUT "Guess a 4-digit number with no duplicate digits: "; guess    guess = LTRIM$(RTRIM$(guess))    IF LEN(guess) = 0 THEN EXIT DO     IF LEN(guess) <> 4 OR VAL(guess) = 0 THEN        PRINT "** You should enter 4 numeric digits!"        GOTO looper    END IF     bulls = 0: cows = 0: guesses = guesses + 1    FOR i = 1 TO 4        c = MID$(secret, i, 1) IF MID$(guess, i, 1) = c THEN            bulls = bulls + 1        ELSEIF INSTR(guess, c) THEN            cows = cows + 1        END IF    NEXT i    PRINT bulls; " bulls, "; cows; " cows"     IF guess = secret THEN        PRINT "You won after "; guesses; " guesses!"        EXIT DO    END IFlooper:LOOP

100 D$= "123456789"110 FOR I = 1 TO 4120 P = INT(RND(1) * LEN(D$)) + 1130    N$= N$ + MID$(D$, P, 1)140    D$= MID$(D$, 1, P - 1) + MID$(D$, P + 1, 8)150 NEXT160 PRINT "A RANDOM NUMBER HAS BEEN CREATED.170 PRINT "THE NUMBER HAS FOUR DIGITS FROM 1 TO 9, WITHOUT DUPLICATION."200 FOR Q = 0 TO 1 STEP 0210 INPUT "GUESS THE NUMBER: "; G%220 G$ = STR$(G%)230 M = LEN(G$) <> 4 OR G% = 0240     IF NOT M THEN FOR I = 2 TO 4 : M = MID$(G$, I, 1) = "0" : IF NOT M THEN NEXT I250     IF NOT M THEN FOR I = 1 TO 3 : FOR J = I + 1 TO 4 : M = MID$(G$, I, 1) = MID$(G$, J, 1) : IF NOT M THEN NEXT J, I260     IF M THEN PRINT "THE GUESS IS MALFORMED." : NEXT Q270     B = 0280     C = 0300     FOR I = 1 TO 4310         C$= MID$(N$, I, 1)320 BULL = MID$(G$, I, 1) = C$330         COW = 0340         IF NOT BULL THEN FOR J = 1 TO 4 : COW = MID$(G$, J, 1) = C$: IF NOT COW THEN NEXT J350 B = B + BULL360 C = C + COW370 NEXT I380 PRINT B " BULLS, " C " COWS"390 Q = G$ = N$400 NEXT Q ### Commodore BASIC Based on the AppleSoft BASIC version. Modifications as follows: • Accommodate 80 character BASIC line length (for line 250 especially), created subroutines. • Booleans in Commodore BASIC evaluate to -1 for TRUE, therefore ABS function added to give desired results. • Leading space in printed numbers (which is placeholder for negative sign) is included in string conversion in Commodore BASIC, therefore RIGHT$ function added on 220 to trim leading whitespace upon conversion.
• Other formatting (clear screen, etc.) unique to Commodore BASIC.

## Batch File

:: Bulls and Cows Task from Rosetta Code:: Batch File Implementation @echo offsetlocal enabledelayedexpansion:: initialization:beginset "list_chars=123456789"set "list_length=9"set "code="set "code_length=4"   %== this should be less than 10 ==%set "tries=0"   %== number of tries ==%:: generate the code to be guessed by playerset "chars_left=%list_chars%"for /l %%c in (1, 1, %code_length%) do (    set /a "rnd=!random! %% (%list_length% + 1 - %%c)"    for %%? in (!rnd!) do set "pick_char=!chars_left:~%%?,1!"    set "code=!code!!pick_char!"    for %%? in (!pick_char!) do set "chars_left=!chars_left:%%?=!"):: get the min and max allowable guess for input validationset "min=!list_chars:~0,%code_length%!"set "max="for /l %%c in (1, 1, %code_length%) do set "max=!max!!list_chars:~-%%c,1!":: display game:displayclsecho(echo(Bulls and Cows Gameecho(Batch File Implementationecho(echo(Gameplay:echo(echo(I have generated a %code_length%-digit code from digits 1-9 without duplication.echo(Your objective is to guess it. If your guess is equal to my code,echo(then you WIN. If not, I will score your guess:echo(echo(** A score of one BULL is accumulated for each digit in your guessecho(that equals the corresponding digit in my code.echo(echo(** A score of one COW is accumulated for each digit in your guessecho(that also appears in my code, but in the WRONG position.echo(echo(Now, start guessing^^!:: input guess:guessecho(set "guess="   %== clear input ==%set /p "guess=Your Guess: ":: validate inputif "!guess!" gtr "%max%" goto invalidif "!guess!" lss "%min%" goto invalidset /a "last_idx=%code_length% - 1"for /l %%i in (0, 1, %last_idx%) do (    set /a "next_idx=%%i + 1"    for /l %%j in (!next_idx!, 1, %last_idx%) do (        if "!guess:~%%i,1!" equ "!guess:~%%j,1!" goto invalid    ))goto score:: display that input is invalid:invalidecho(Please input a valid guess.goto guess:: scoring section:scoreset /a "tries+=1"if "%guess%" equ "%code%" goto winset "cow=0"set "bull=0"for /l %%i in (0, 1, %last_idx%) do (    for /l %%j in (0, 1, %last_idx%) do (        if "!guess:~%%i,1!" equ "!code:~%%j,1!" (            if "%%i" equ "%%j" (                set /a "bull+=1"            ) else (                set /a "cow+=1"            )        )    )):: display score and go back to user inputecho(BULLS = %bull%; COWS = %cow%.goto guess:: player wins!:winecho(echo(After %tries% tries, YOU CRACKED IT^^! My code is %code%.echo(set /p "opt=Play again? "if /i "!opt!" equ "y" goto beginexit /b 0
Output:
Bulls and Cows Game
Batch File Implementation

Gameplay:

I have generated a 4-digit code from digits 1-9 without duplication.
Your objective is to guess it. If your guess is equal to my code,
then you WIN. If not, I will score your guess:

** A score of one BULL is accumulated for each digit in your guess
that equals the corresponding digit in my code.

** A score of one COW is accumulated for each digit in your guess
that also appears in my code, but in the WRONG position.

Now, start guessing!

Your Guess: 0123
Please input a valid guess.

Your Guess: 1234
BULLS = 0; COWS = 3.

Your Guess: 4123
BULLS = 2; COWS = 1.

...

Your Guess: 4391
BULLS = 2; COWS = 0.

Your Guess: 4521
BULLS = 3; COWS = 0.

Your Guess: 4621
BULLS = 3; COWS = 0.

Your Guess: 4821

After 10 tries, YOU CRACKED IT! My code is 4821.

Play again? 

## Coco

Library: Underscore.js

To handle I/O, we use functions named say (which simply outputs a string) and prompt (which takes a prompt string to display to the user and returns a line of input, without a trailing newline). These require platform-specific implementations. Here's how they can be implemented for the SpiderMonkey shell:

say = printprompt = (str) ->    putstr str    readline! ? quit!

We can now solve the task using say and prompt:

const SIZE = 4 secret = _.sample ['1' to '9'], SIZE for ever    var guess    for ever        guess := _.uniq prompt 'Enter a guess: '        if guess.length === SIZE and not _.difference guess, ['1' to '9'] .length            break        say 'Malformed guess; try again.'    bulls = cows = 0    for i til SIZE        if guess[i] === secret[i]            ++bulls        else if _.contains secret, guess[i]            ++cows    if bulls === SIZE        break    say "#bulls bull#{[if bulls !== 1 then 's']}, #cows cow#{[if cows !== 1 then 's']}." say 'A winner is you!'

## Common Lisp

(defun get-number ()  (do ((digits '()))      ((>= (length digits) 4) digits)    (pushnew (1+ (random 9)) digits))) (defun compute-score (guess number)  (let ((cows  0)        (bulls 0))    (map nil (lambda (guess-digit number-digit)               (cond ((= guess-digit number-digit) (incf bulls))                     ((member guess-digit number)  (incf cows))))         guess number)    (values cows bulls))) (defun number->guess (number)  (when (integerp number)    (do ((digits '()))        ((zerop number) digits)      (multiple-value-bind (quotient remainder) (floor number 10)        (push remainder digits)        (setf number quotient))))) (defun valid-guess-p (guess)  (and (= 4 (length guess))       (every (lambda (digit) (<= 1 digit 9)) guess)       (equal guess (remove-duplicates guess)))) (defun play-game (&optional (stream *query-io*))  (do ((number (get-number))       (cows   0)       (bulls  0))      ((= 4 bulls))    (format stream "~&Guess a 4-digit number: ")    (let ((guess (number->guess (read stream))))      (cond ((not (valid-guess-p guess))             (format stream "~&Malformed guess."))            (t             (setf (values cows bulls) (compute-score guess number))             (if (= 4 bulls)               (format stream "~&Correct, you win!")               (format stream "~&Score: ~a cows, ~a bulls."                       cows bulls)))))))

## Crystal

Translation of: Ruby
size = 4secret = ('1'..'9').to_a.sample(size)guess = [] of Char i = 0loop do  i += 1  loop do    print "Guess #{i}: "    guess = gets.not_nil!.chomp.chars    exit if guess.empty?     break if guess.size == size &&             guess.all? { |x| ('1'..'9').includes? x } &&             guess.uniq.size == size     puts "Problem, try again. You need to enter #{size} unique digits from 1 to 9"  end   if guess == secret    puts "Congratulations you guessed correctly in #{i} attempts"    break  end   bulls = cows = 0  size.times do |j|    if guess[j] == secret[j]      bulls += 1    elsif secret.includes? guess[j]      cows += 1    end  end   puts "Bulls: #{bulls}; Cows: #{cows}"end

## D

void main() {    import std.stdio, std.random, std.string, std.algorithm,           std.range, std.ascii;     immutable hidden = "123456789"d.randomCover.take(4).array;    while (true) {        "Next guess: ".write;        const d = readln.strip.array.sort().release;        if (d.count == 4 && d.all!isDigit && d.uniq.count == 4) {            immutable bulls = d.zip(hidden).count!q{ a == a },                      cows = d.count!(g => hidden.canFind(g)) - bulls;            if (bulls == 4)                return " You guessed it!".writeln;            writefln("bulls %d, cows %d", bulls, cows);        }        " Bad guess! (4 unique digits, 1-9)".writeln;    }}
Output:
Next guess: 6548
bulls 0, cows 3
Bad guess! (4 unique digits, 1-9)
Next guess: 5284
bulls 2, cows 1
Bad guess! (4 unique digits, 1-9)
Next guess: 4386
bulls 0, cows 2
Bad guess! (4 unique digits, 1-9)
Next guess: -
Bad guess! (4 unique digits, 1-9)
Next guess: 5894
bulls 3, cows 0
Bad guess! (4 unique digits, 1-9)
Next guess: 5874
bulls 3, cows 0
Bad guess! (4 unique digits, 1-9)
Next guess: 5814
You guessed it!

See #Pascal.

## E

Note: This example was deliberately written in an abstracted style, separating out the algorithms, game logic, and UI.

def Digit := 1..9def Number := Tuple[Digit,Digit,Digit,Digit] /** Choose a random number to be guessed. */def pick4(entropy) {    def digits := [1,2,3,4,5,6,7,8,9].diverge()     # Partial Fisher-Yates shuffle    for i in 0..!4 {        def other := entropy.nextInt(digits.size() - i) + i        def t := digits[other]        digits[other] := digits[i]        digits[i] := t    }    return digits(0, 4)} /** Compute the score of a guess. */def scoreGuess(actual :Number, guess :Number) {    var bulls := 0    var cows := 0    for i => digit in guess {        if (digit == actual[i]) {            bulls += 1        } else if (actual.indexOf1(digit) != -1) {            cows += 1        }    }    return [bulls, cows]} /** Parse a guess string into a list of digits (Number). */def parseGuess(guessString, fail) :Number {    if (guessString.size() != 4) {        return fail(I need four digits, not ${guessString.size()} digits.) } else { var digits := [] for c in guessString { if (('1'..'9')(c)) { digits with= c - '0' } else { return fail(I need a digit from 1 to 9, not "$c".)            }        }        return digits    }  } /** The game loop: asking for guesses and reporting scores and win conditions.    The return value is null or a broken reference if there was a problem. */def bullsAndCows(askUserForGuess, tellUser, entropy) {    def actual := pick4(entropy)     def gameTurn() {        return when (def guessString := askUserForGuess <- ()) -> {            escape tellAndContinue {                 def guess := parseGuess(guessString, tellAndContinue)                                def [bulls, cows] := scoreGuess(actual, guess)                 if (bulls == 4) {                    tellUser <- (You got it! The number is $actual!) null } else { tellAndContinue(Your score for$guessString is $bulls bulls and$cows cows.)                }             } catch message {                # The parser or scorer has something to say, and the game continues afterward                when (tellUser <- (message)) -> {                    gameTurn()                }            }        } catch p {            # Unexpected problem of some sort            tellUser <- ("Sorry, game crashed.")            throw(p)        }    }     return gameTurn()}

### REPL user interface

def replBullsAndCows() {
when (
bullsAndCows(fn {
def [guess, env] := edef guess; guess.evalToPair(interp.getTopScope().nestOuter())
interp.setTopScope(env)
println("Please type “ bind guess := \"your guess here\" ”.")
guess
}, println, entropy)
) -> {} catch p {
println($p${p.eStack()})
}
}

### Graphical user interface

Works with: E-on-Java
(Java Swing)
def guiBullsAndCows() {    var lastGuess := ""    def op := <unsafe:javax.swing.makeJOptionPane>    return bullsAndCows(fn {      lastGuess := op.showInputDialog(null, "Enter your guess:", lastGuess)      if (lastGuess == null) {        # canceled, so just fail to return an answer and let the game logic get GCed        Ref.promise()      } else {        lastGuess      }    }, fn msg {      op.showMessageDialog(null, msg)    }, entropy)}

dig[] = [ 1 2 3 4 5 6 7 8 9 ]for i range 4  h = i + random (9 - i)  swap dig[i] dig[h].# print dig[]len g[] 4attempts = 0repeat  repeat    ok = 0    s$[] = str_chars input if len s$[] = 4      ok = 1      for i range 4        g[i] = number s$[i] if g[i] = 0 ok = 0 . . . until ok = 1 . print g[] attempts += 1 bulls = 0 cows = 0 for i range 4 if g[i] = dig[i] bulls += 1 else for j range 4 if dig[j] = g[i] cows += 1 . . . . print "bulls:" & bulls & " cows:" & cows until bulls = 4.print "Well done! " & attempts & " attempts needed." ## Eiffel  class BULLS_AND_COWS create execute feature execute -- Initiate game. do io.put_string ("Let's play bulls and cows.%N") create answer.make_empty play end feature {NONE} play -- Plays bulls ans cows. local count, seed: INTEGER guess: STRING do from until seed > 0 loop io.put_string ("Enter a positive integer.%NYour play will be generated from it.%N") io.read_integer seed := io.last_integer end generate_answer (seed) io.put_string ("Your game has been created.%N Try to guess the four digit number.%N") create guess.make_empty from until guess ~ answer loop io.put_string ("Guess: ") io.read_line guess := io.last_string if guess.count = 4 and guess.is_natural and not guess.has ('0') then io.put_string (score (guess) + "%N") count := count + 1 else io.put_string ("Your input does not have the correct format.") end end io.put_string ("Congratulations! You won with " + count.out + " guesses.") end answer: STRING generate_answer (s: INTEGER) -- Answer with 4-digits between 1 and 9 stored in 'answer'. require positive_seed: s > 0 local random: RANDOM ran: INTEGER do create random.set_seed (s) from until answer.count = 4 loop ran := (random.double_item * 10).floor if ran > 0 and not answer.has_substring (ran.out) then answer.append (ran.out) end random.forth end ensure answer_not_void: answer /= Void correct_length: answer.count = 4 end score (g: STRING): STRING -- Score for the guess 'g' depending on 'answer'. require same_length: answer.count = g.count local k: INTEGER a, ge: STRING do Result := "" a := answer.twin ge := g.twin across 1 |..| a.count as c loop if a [c.item] ~ ge [c.item] then Result := Result + "BULL " a [c.item] := ' ' ge [c.item] := ' ' end end across 1 |..| a.count as c loop if a [c.item] /= ' ' then k := ge.index_of (a [c.item], 1) if k > 0 then Result := Result + "COW " ge [k] := ' ' end end end end end  Output: Let's play bulls and cows. Enter a positive integer. Your play will be generated from it. 2 Guess: 2497 BULL COW Guess: 2486 BULL COW COW Guess: 2485 BULL COW COW Guess: 2483 BULL BULL COW COW Guess: 2438 BULL COW COW COW Guess: 2843 BULL BULL BULL BULL Congratulations! You won with 6 guesses.  ## Elena ELENA 5.0 : import system'routines;import extensions; class GameMaster{ object theNumbers; object theAttempt; constructor() { // generate secret number var randomNumbers := new int[]{1,2,3,4,5,6,7,8,9}.randomize(9); theNumbers := randomNumbers.Subarray(0, 4); theAttempt := new Integer(1); } ask() { var row := console.print("Your Guess #",theAttempt," ?").readLine(); ^ row.toArray() } proceed(guess) { int cows := 0; int bulls := 0; if (guess.Length != 4) { bulls := -1 } else { try { for (int i := 0, i < 4, i+=1) { var ch := guess[i]; var number := ch.toString().toInt(); // check range ifnot (number > 0 && number < 10) { InvalidArgumentException.raise() }; // check duplicates var duplicate := guess.seekEach:(x => (x == ch)&&(x.equalReference(ch).Inverted)); if (nil != duplicate) { InvalidArgumentException.raise() }; if (number == theNumbers[i]) { bulls += 1 } else { if (theNumbers.ifExists(number)) { cows += 1 } } } } catch(Exception e) { bulls := -1 } }; bulls => -1 { console.printLine:"Not a valid guess."; ^ true } 4 { console.printLine:"Congratulations! You have won!"; ^ false } : { theAttempt.append(1); console.printLine("Your Score is ",bulls," bulls and ",cows," cows"); ^ true } }} public program(){ var gameMaster := new GameMaster(); (lazy:gameMaster.proceed(gameMaster.ask())).doWhile(); console.readChar()} Output: Your Guess #1 ?2497 Your Score is 1 bulls and 1 cows Your Guess #2 ?2486 Your Score is 1 bulls and 2 cows Your Guess #3 ?2485 Your Score is 1 bulls and 2 cows Your Guess #4 ?2483 Your Score is 2 bulls and 2 cows Your Guess #5 ?2438 Your Score is 1 bulls and 3 cows Your Guess #6 ?2843 Congratulations! You have won!  ## Elixir Works with: Elixir version 1.2 defmodule Bulls_and_cows do def play(size \\ 4) do secret = Enum.take_random(1..9, size) |> Enum.map(&to_string/1) play(size, secret) end defp play(size, secret) do guess = input(size) if guess == secret do IO.puts "You win!" else {bulls, cows} = count(guess, secret) IO.puts " Bulls: #{bulls}; Cows: #{cows}" play(size, secret) end end defp input(size) do guess = IO.gets("Enter your #{size}-digit guess: ") |> String.strip cond do guess == "" -> IO.puts "Give up" exit(:normal) String.length(guess)==size and String.match?(guess, ~r/^[1-9]+$/) ->        String.codepoints(guess)      true -> input(size)    end  end   defp count(guess, secret) do    Enum.zip(guess, secret) |>    Enum.reduce({0,0}, fn {g,s},{bulls,cows} ->      cond do        g == s      -> {bulls + 1, cows}        g in secret -> {bulls, cows + 1}        true        -> {bulls, cows}      end    end)  endend Bulls_and_cows.play
Output:
Enter your 4-digit guess: 1234
Bulls: 1; Cows: 1
Enter your 4-digit guess: 5678
Bulls: 0; Cows: 2
Enter your 4-digit guess: 2345
Bulls: 0; Cows: 1
Enter your 4-digit guess: 1456
Bulls: 1; Cows: 0
Enter your 4-digit guess: 1782
You win!


## Erlang

Module:

-module(bulls_and_cows).-export([generate_secret/0, score_guess/2, play/0]). % generate the secret codegenerate_secret() -> generate_secret([], 4, lists:seq(1,9)).generate_secret(Secret, 0, _) -> Secret;generate_secret(Secret, N, Digits) ->  Next = lists:nth(random:uniform(length(Digits)), Digits),  generate_secret(Secret ++ [Next], N - 1, Digits -- [Next]). % evaluate a guess score_guess(Secret, Guess)  when length(Secret) =/= length(Guess) -> throw(badguess);score_guess(Secret, Guess) ->  Bulls = count_bulls(Secret,Guess),  Cows = count_cows(Secret, Guess, Bulls),  [Bulls, Cows]. % count bulls (exact matches)count_bulls(Secret, Guess) ->  length(lists:filter(fun(I) -> lists:nth(I,Secret) == lists:nth(I,Guess) end,                      lists:seq(1, length(Secret)))). % count cows (digits present but out of place)count_cows(Secret, Guess, Bulls) ->   length(lists:filter(fun(I) -> lists:member(I, Guess) end, Secret)) - Bulls. % play a gameplay() -> play_round(generate_secret()). play_round(Secret) -> play_round(Secret, read_guess()). play_round(Secret, Guess) ->  play_round(Secret, Guess, score_guess(Secret,Guess)). play_round(_, _, [4,0]) ->  io:put_chars("Correct!\n"); play_round(Secret, _, Score) ->  io:put_chars("\tbulls:"), io:write(hd(Score)), io:put_chars(", cows:"),  io:write(hd(tl(Score))), io:put_chars("\n"), play_round(Secret). read_guess() ->  lists:map(fun(D)->D-48 end,    lists:sublist(io:get_line("Enter your 4-digit guess: "), 4)).

Script:

#!/usr/bin/escript% Play Bulls and Cowsmain(_) -> random:seed(now()), bulls_and_cows:play().
Sample play:
Enter your 4-digit guess: 8376
bulls:1, cows:0
Enter your 4-digit guess: 8941
bulls:1, cows:1
Enter your 4-digit guess: 8529
bulls:1, cows:1
Enter your 4-digit guess: 4926
bulls:1, cows:1
Enter your 4-digit guess: 9321
Correct!


## Euphoria

Works with: Euphoria version 4.0.3, 4.0.0 RC1 and later
include std\text.einclude std\os.einclude std\sequence.einclude std\console.e sequence bcData = {0,0} --bull,cow score for the playersequence goalNum = { {0,0,0,0}, {0,0,0,0}, 0} --computer's secret number digits (element 1), marked as bull/cow--indexes in element 2, integer value of it in element 3sequence currentGuess = { {0,0,0,0}, {0,0,0,0}, 0} --player's guess, same format as goalNumsequence removeChars = 0 & " 0\r\t\n" --characters to trim (remove) from user's input. \r, \t are single escaped characters,--0 is ascii 0x0 and number zero is ascii 48, or 0x30. The rest are wysiwyginteger tries = 0 --track number of tries to guess the numbersequence bcStrings ={"bull", "cow"} --stores singular and/or plural strings depending on score in bcData goalNum = rand( {9,9,9,9} ) --rand function works on objects. here it outputs into each sequence element.goalNum = goalNum * 1000 + goalNum * 100 + goalNum * 10 + goalNum --convert digits to an integer--and store it procedure getInputAndProcess(integer stage = 1)  --object = 1 sets default value for the parameter if it isn't specified     goalNum[1..4] = 0 --{0,0,0,0} --set these to unscaned (0) since the scanning will start over.     currentGuess[1..4] = 0 --{0,0,0,0} --these too, or they will contain old marks    currentGuess[1..4] = 0    tries += 1 --equivalent to tries = tries + 1, but faster and shorter to write    bcData[1..2] = 0 -- {0,0}     if stage <= 1 then --if this process was run for the first time or with no parameters, then..        puts(1,"The program has thought of a four digit number using only digits 1 to 9.\nType your guess and press enter.\n")    end if     while 1 label "guesscheck" do --labels can be used to specify a jump point from exit or retry, and help readability        currentGuess = trim(gets(0), removeChars) --get user input, trim unwanted characters from it, store it in currentGuess        currentGuess = mapping( currentGuess, {49,50,51,52,53,54,55,56,57}, {1,2,3,4,5,6,7,8,9} ) --convert ascii codes to        -- integer digits they represent        integer tempF = find('0',currentGuess)        if length(currentGuess) != 4 or tempF != 0 then --if the input string is now more than 4 characters/integers,            --the input won't be used.            puts(1,"You probably typed too many digits or a 0. Try typing a new 4 digit number with only numbers 1 through 9.\n")            retry "guesscheck"            else                exit "guesscheck"        end if    end while    --convert separate digits to the one integer they represent and store it, like with goalNum    currentGuess = currentGuess * 1000 + currentGuess * 100 + currentGuess * 10 + currentGuess --convert digits to the integer they represent, to print to a string later     --check for bulls    for i = 1 to 4 do        if goalNum[i] = currentGuess[i] then            goalNum[i] = 1            currentGuess[i] = 1            bcData += 1        end if    end for     --check for cows, but not slots marked as bulls or cows already.    for i = 1 to 4 label "iGuessElem"do --loop through each guessed digit        for j = 1 to 4 label "jGoalElem" do --but first go through each goal digit, comparing the first guessed digit,            --and then the other guessed digits 2 through 4             if currentGuess[i] = 1 then --if the guessed digit we're comparing right now has been marked as bull or cow already                continue "iGuessElem" --skip to the next guess digit without comparing this guess digit to the other goal digits            end if             if goalNum[j] = 1 then --if the goal digit we're comparing to right now has been marked as a bull or cow already                continue "jGoalElem" --skip to the next goal digit            end if             if currentGuess[i] = goalNum[j] then --if the guessed digit is the same as the goal one,                 --it won't be a bull, so it's a cow                bcData += 1 --score one more cow                goalNum[j] = 1 --mark this digit as a found cow in the subsequence that stores 0's or 1's as flags                continue "iGuessElem" --skip to the next guess digit, so that this digit won't try to check for                --matches(cow) with other goal digits            end if         end for --this guess digit was compared to one goal digit , try comparing this guess digit with the next goal digit    end for --this guess digit was compared with all goal digits, compare the next guess digit to all the goal digits     if bcData = 1 then --uses singular noun when there is score of 1, else plural        bcStrings = "bull"        else            bcStrings = "bulls"    end if     if bcData = 1 then --the same kind of thing as above block        bcStrings = "cow"        else            bcStrings = "cows"    end if     if bcData < 4 then --if less than 4 bulls were found, the player hasn't won, else they have...        printf(1, "Guess #%d : You guessed %d . You found %d %s, %d %s. Type new guess.\n", {tries, currentGuess, bcData, bcStrings, bcData, bcStrings} )        getInputAndProcess(2)    else --else they have won and the procedure ends        printf(1, "The number was %d. You guessed %d in %d tries.\n", {goalNum, currentGuess, tries} )        any_key()--wait for keypress before closing console window.     end if end procedure--run the proceduregetInputAndProcess(1)   

Output :

The program has thought of a four digit number using only digits 1 to 9.
Type your guess and press enter.
7456
Guess #1 : You guessed 7456 . You found 1 bull, 1 cow. Type new guess.
7116
Guess #2 : You guessed 7116 . You found 1 bull, 0 cows. Type new guess.
7862
Guess #3 : You guessed 7862 . You found 0 bulls, 2 cows. Type new guess.
1826
[...etc]
6586
Guess #10 : You guessed 6586 . You found 3 bulls, 0 cows. Type new guess.
5586
Guess #11 : You guessed 5586 . You found 3 bulls, 0 cows. Type new guess.
2586
Guess #12 : You guessed 2586 . You found 3 bulls, 0 cows. Type new guess.
9586
The number was 9586. You guessed 9586 in 13 tries.
Press Any Key to continue...


## Factor

USING: accessors assocs combinators fry grouping hashtables kernel       locals math math.parser math.ranges random sequences strings       io ascii ; IN: bullsncows TUPLE: score bulls cows ;: <score> ( -- score ) 0 0 score boa ; TUPLE: cow ;: <cow> ( -- cow ) cow new ; TUPLE: bull ;: <bull> ( -- bull ) bull new ; : inc-bulls ( score -- score ) dup bulls>> 1 + >>bulls ;: inc-cows ( score -- score ) dup cows>> 1 + >>cows ; : random-nums ( -- seq ) 9 [1,b] 4 sample ; : add-digits ( seq -- n ) 0 [ swap 10 * + ] reduce number>string ; : new-number ( -- n narr ) random-nums dup add-digits ; : narr>nhash ( narr -- nhash ) { 1 2 3 4 } swap zip ; : num>hash ( n -- hash )    [ 1string string>number ] { } map-as narr>nhash ; :: cow-or-bull ( n g -- arr )    {        { [ n first g at n second = ] [ <bull> ] }        { [ n second g value? ] [ <cow> ] }        [ f ]    } cond ; : add-to-score ( arr -- score )   <score> [ bull? [ inc-bulls ] [ inc-cows ] if ] reduce ; : check-win ( score -- ? ) bulls>> 4 = ; : sum-score ( n g -- score ? )    '[ _ cow-or-bull ] map sift add-to-score dup check-win ; : print-sum ( score -- str )    dup bulls>> number>string "Bulls: " swap append swap cows>> number>string    " Cows: " swap 3append "\n" append ; : (validate-readln) ( str -- ? ) dup length 4 = not swap [ letter? ] all? or ; : validate-readln ( -- str )    readln dup (validate-readln)    [ "Invalid input.\nPlease enter a valid 4 digit number: "      write flush drop validate-readln ]    when ; : win ( -- ) "\nYou've won! Good job. You're so smart." print flush ;  : main-loop ( x -- )    "Enter a 4 digit number: " write flush validate-readln num>hash swap    [ sum-score swap print-sum print flush ] keep swap not    [ main-loop ] [ drop win ] if ; : main ( -- ) new-number drop narr>nhash main-loop ;

## Fan

**** Bulls and cows. A game pre-dating, and similar to, Mastermind.**class BullsAndCows{   Void main()  {    digits := [1,2,3,4,5,6,7,8,9]    size := 4    chosen := [,]    size.times { chosen.add(digits.removeAt(Int.random(0..<digits.size))) }     echo("I've chosen $size unique digits from 1 to 9 at random. Try to guess my number!") guesses := 0 while (true) // game loop { guesses += 1 guess := Int[,] while (true) // input loop { // get a good guess Sys.out.print("\nNext guess [$guesses]: ")        Sys.out.flush        inString := Sys.in.readLine?.trim ?: ""        inString.each |ch|        { if (ch >= '1' && ch <= '9' && !guess.contains(ch)) guess.add(ch-'0') }        if (guess.size == 4)          break // input loop        echo("Oops, try again. You need to enter $size unique digits from 1 to 9") } if (guess.all |v, i->Bool| { return v == chosen[i] }) { echo("\nCongratulations! You guessed correctly in$guesses guesses")        break // game loop      }      bulls := 0      cows  := 0      (0 ..< size).each |i|      {        if (guess[i] == chosen[i])          bulls += 1        else if (chosen.contains(guess[i]))          cows += 1      }      echo("\n  $bulls Bulls\n$cows Cows")    }  }}

## FOCAL

01.10 T %1,"BULLS AND COWS"!"----- --- ----"!!01.20 S T=0;D 301.30 D 2;D 5;S T=T+1;T "BULLS",B," COWS",C,!!01.40 I (B-4)1.301.50 T "YOU WON! GUESSES",%4,T,!!01.60 Q 02.10 A "GUESS",A02.20 F X=0,3;S B=FITR(A/10);S G(3-X)=A-B*10;S A=B02.30 S A=102.40 F X=0,3;S A=A*G(X)02.50 I (-A)2.6;T "NEED FOUR NONZERO DIGITS"!;G 2.102.60 F X=0,2;F Y=X+1,3;S A=A*(FABS(G(X)-G(Y)))02.70 I (-A)2.8;T "NO DUPLICATES ALLOWED"!;G 2.102.80 R 03.10 F X=0,3;S S(X)=003.20 F X=0,3;D 4;S S(X)=A 04.10 S A=10*FRAN();S A=FITR(1+9*(A-FITR(A)))04.20 S Z=104.30 F Y=0,3;S Z=Z*(FABS(A-S(Y)))04.40 I (-Z)4.5,4.104.50 R 05.10 S B=005.20 F X=0,3;D 5.605.30 S C=-B05.40 F X=0,3;F Y=0,3;D 5.705.50 R05.60 I (-FABS(S(X)-G(X)))5.5,5.805.70 I (-FABS(S(X)-G(Y)))5.5,5.905.80 S B=B+105.90 S C=C+1
Output:
BULLS AND COWS
----- --- ----

GUESS:1234
BULLS= 0 COWS= 3

GUESS:3214
BULLS= 1 COWS= 2

GUESS:3124
BULLS= 2 COWS= 1

GUESS:3145
BULLS= 3 COWS= 0

GUESS:3146
BULLS= 3 COWS= 0

GUESS:3147
BULLS= 3 COWS= 0

GUESS:3148
BULLS= 3 COWS= 0

GUESS:3149
BULLS= 4 COWS= 0

YOU WON! GUESSES=    8

## Forth

Works with: GNU Forth
include random.fs create hidden 4 allot : ok? ( str -- ? )  dup 4 <> if 2drop false exit then  1 9 lshift 1- -rot  bounds do    i [email protected] '1 -    dup 0 9 within 0= if 2drop false leave then    1 swap lshift over and    dup 0= if nip leave then    xor  loop 0<> ; : init  begin    hidden 4 bounds do 9 random '1 + i c! loop    hidden 4 ok?  until ; : check? ( addr -- solved? )  0  4 0 do    over i + [email protected]    4 0 do      dup hidden i + [email protected] = if     swap        i j = if 8 else 1 then + swap      then    loop drop  loop nip  8 /mod tuck . ." bulls, " . ." cows"  4 = ; : guess: ( "1234" -- )  bl parse 2dup ok? 0= if 2drop ." Bad guess! (4 unique digits, 1-9)" exit then  drop check? if cr ." You guessed it!" then ;
Output:
init  ok
guess: 1234 1 bulls, 0 cows ok
guess: 1567 1 bulls, 1 cows ok
guess: 1895 2 bulls, 1 cows ok
guess: 1879 4 bulls, 0 cows
You guessed it! ok

## Fortran

Works with: Fortran version 90 and later
module bac  implicit none contains   subroutine Gennum(n)    integer, intent(out) :: n(4)    integer :: i, j    real :: r     call random_number(r)    n(1) = int(r * 9.0) + 1    i = 2 outer: do while (i <= 4)         call random_number(r)         n(i) = int(r * 9.0) + 1inner:   do j = i-1 , 1, -1           if (n(j) == n(i)) cycle outer         end do inner         i = i + 1       end do outer   end subroutine Gennum   subroutine Score(n, guess, b, c)     character(*), intent(in) :: guess    integer, intent(in) :: n(0:3)    integer, intent(out) :: b, c    integer :: digit, i, j, ind     b = 0; c = 0    do i = 1, 4      read(guess(i:i), "(i1)") digit      if (digit == n(i-1)) then        b = b + 1      else        do j = i, i+2          ind = mod(j, 4)          if (digit == n(ind)) then            c = c + 1            exit          end if        end do          end if    end do    end subroutine Score   end module bac program Bulls_and_Cows   use bac   implicit none    integer :: n(4)   integer :: bulls=0, cows=0, tries=0   character(4) :: guess    call random_seed   call Gennum(n)    write(*,*) "I have selected a number made up of 4 digits (1-9) without repetitions."   write(*,*) "You attempt to guess this number."   write(*,*) "Every digit in your guess that is in the correct position scores 1 Bull"   write(*,*) "Every digit in your guess that is in an incorrect position scores 1 Cow"   write(*,*)    do while (bulls /= 4)     write(*,*) "Enter a 4 digit number"     read*, guess     if (verify(guess, "123456789") /= 0) then       write(*,*) "That is an invalid entry. Please try again."       cycle     end if     tries = tries + 1     call Score (n, guess, bulls, cows)     write(*, "(a, i1, a, i1, a)") "You scored ", bulls, " bulls and ", cows, " cows"     write(*,*)   end do    write(*,"(a,i0,a)") "Congratulations! You correctly guessed the correct number in ", tries, " attempts" end program Bulls_and_Cows

## FreeBASIC

function get_digit( num as uinteger, ps as uinteger ) as uinteger    return (num mod 10^(ps+1))\10^psend function function is_malformed( num as uinteger ) as boolean    if num > 9876 then return true    dim as uinteger i, j    for i = 0 to 2        for j = i+1 to 3            if get_digit( num, j ) = get_digit( num, i ) then return true        next j    next i    return falseend function function make_number() as uinteger    dim as uinteger num = 0    while is_malformed(num)        num = int(rnd*9877)    wend    return numend function randomize timer dim as uinteger count=0, num=make_number(), guess=0dim as uinteger cows, bulls, i, j while guess <> num    count += 1    do        print "Guess a number. "        input guess    loop while is_malformed(guess)     cows = 0    bulls = 0     for i = 0 to 3        for j = 0 to 3            if get_digit( num, i ) = get_digit( guess, j ) then                if i= j then bulls += 1                if i<>j then cows  += 1            end if        next j    next i    print using "You scored # bulls and # cows."; bulls; cowswend print using "Correct. That took you ### guesses."; count

## Frink

 // Bulls and Cows - Written in Frinkprintln["Welcome to Bulls and Cows!"] // Put 4 random digits into target arraydigits = array[1 to 9]target = new arrayfor i = 0 to 3{   [email protected] = digits.removeRandom[]} // Game variablesguessCount = 0solved = 0 while solved == 0{   // Round variables   bulls = 0   cows = 0    // Input guess from player   guess = input["Guess a 4 digit number with numbers 1 to 9: "]    // Valid Guess Tests. Set validGuess to 1. If any test fails it will be set to 0   validGuess = 1   // Test for exactly 4 digits   if length[guess] != 4   {      println["$guess is invalid. Your guess must be 4 digits."] validGuess = 0 } // Test for any characters not in 1 - 9 using regex if guess =~ %r/[^1-9]/ { println["$guess is invalid. Your guess can only contain the digits 1 through 9."]      validGuess = 0   }   // Check for duplicate digits in guess   comboCheck = 1   guessArr = charList[guess] // Split guess string into array of characters.   guessArrCombos = guessArr.combinations // Divide the array into all possible 2 digits combinations.   for geussCombo = guessArrCombos   {      if [email protected] == [email protected] // If the two digits in the combinations are the same mark the comboCheck as failed.         comboCheck = 0   }   if comboCheck == 0   {      println["$guess is invalid. Each digit in your guess should be unique."] validGuess = 0 } // If all tests pass, continue with the game. if validGuess == 1 { guessCount = guessCount + 1 for i = 0 to 3 { if parseInt[[email protected]] == [email protected] // Convert guess from string to int. Frink imports all input as strings. { bulls = bulls + 1 next // If bull is found, skip the contains check. } if target.contains[parseInt[[email protected]]] { cows = cows + 1 } } if bulls == 4 { solved = 1 // Exit from While loop. } else { // Print the results of the guess. Formatting for plurals. bullsPlural = bulls == 1 ? "bull" : "bulls" cowsPlural = cows == 1 ? "cow" : "cows" println["Your guess of$guess had $bulls$bullsPlural and $cows$cowsPlural."]      }   }}guessPlural = guessCount == 1 ? "guess" : "guesses"println["Congratulations! Your guess of $guess was correct! You solved this in$guessCount $guessPlural."]  Output: Welcome to Bulls and Cows! Your guess of 1234 had 1 bull and 2 cows. Your guess of 5678 had 0 bulls and 1 cow. Your guess of 2345 had 0 bulls and 2 cows. Your guess of 3261 had 1 bull and 2 cows. Your guess of 4173 had 0 bulls and 3 cows. Your guess of 8231 had 2 bulls and 0 cows. Your guess of 7134 had 1 bull and 2 cows. Your guess of 3461 had 2 bulls and 2 cows. Congratulations! Your guess of 6431 was correct! You solved this in 9 guesses.  ## Go package main import ( "bufio" "bytes" "fmt" "math/rand" "os" "strings" "time") func main() { fmt.Println(Cows and BullsGuess four digit number of unique digits in the range 1 to 9.A correct digit but not in the correct place is a cow.A correct digit in the correct place is a bull.) // generate pattern pat := make([]byte, 4) rand.Seed(time.Now().Unix()) r := rand.Perm(9) for i := range pat { pat[i] = '1' + byte(r[i]) } // accept and score guesses valid := []byte("123456789")guess: for in := bufio.NewReader(os.Stdin); ; { fmt.Print("Guess: ") guess, err := in.ReadString('\n') if err != nil { fmt.Println("\nSo, bye.") return } guess = strings.TrimSpace(guess) if len(guess) != 4 { // malformed: not four characters fmt.Println("Please guess a four digit number.") continue } var cows, bulls int for ig, cg := range guess { if strings.IndexRune(guess[:ig], cg) >= 0 { // malformed: repeated digit fmt.Printf("Repeated digit: %c\n", cg) continue guess } switch bytes.IndexByte(pat, byte(cg)) { case -1: if bytes.IndexByte(valid, byte(cg)) == -1 { // malformed: not a digit fmt.Printf("Invalid digit: %c\n", cg) continue guess } default: // I just think cows should go first cows++ case ig: bulls++ } } fmt.Printf("Cows: %d, bulls: %d\n", cows, bulls) if bulls == 4 { fmt.Println("You got it.") return } }} ## Golo #!/usr/bin/env golosh----This module is the Bulls and Cows game.----module Bullsandcows import gololang.Decoratorsimport gololang.Functionsimport gololang.IOimport java.util function main = |args| { while true { let secret = create4RandomNumbers() println("Welcome to Bulls And Cows") while true { println("Please enter a 4 digit number") println("(with only the digits 1 to 9 and no repeated digits, for example 2537)") let guess = readln("guess: ") let result = validateGuess(guess) if result: isValid() { let bulls, cows = bullsAndOrCows(result: digits(), secret) if bulls is 4 { println("You win!") break } println("bulls: " + bulls) println("cows: " + cows) } else { println(result: message()) } } }} function create4RandomNumbers = { let numbers = vector[1, 2, 3, 4, 5, 6, 7, 8, 9] Collections.shuffle(numbers) let shuffled = numbers: subList(0, 4) return shuffled} union Result = { Valid = { digits } Invalid = { message }} @checkArguments(isString())function validateGuess = |guess| { var digits = [] try { let number = guess: toInt() digits = number: digits() if digits: exists(|d| -> d is 0) { return Result.Invalid("No zeroes please") } if digits: size() isnt 4 { return Result.Invalid("Four digits please") } let digitSet = set[ digit foreach digit in digits ] if digitSet: size() < digits: size() { return Result.Invalid("No duplicate numbers please") } } catch(e) { return Result.Invalid("Numbers only please") } return Result.Valid(digits)} let is4Vector = |arg| -> arg oftype java.util.List.class and arg: size() is 4 @checkArguments(is4Vector, is4Vector)function bullsAndOrCows = |guess, secret| { var bulls = 0 var cows = 0 foreach i in [0..4] { let guessNum = guess: get(i) let secretNum = secret: get(i) if guessNum is secretNum { bulls = bulls + 1 } else if secret: exists(|num| -> guessNum is num) { cows = cows + 1 } } return [bulls, cows]} augment java.lang.Integer { function digits = |this| { var remaining = this let digits = vector[] while remaining > 0 { digits: prepend(remaining % 10) remaining = remaining / 10 } return digits }}  ## Haskell import Data.List (partition, intersect, nub)import Control.Monadimport System.Random (StdGen, getStdRandom, randomR)import Text.Printf numberOfDigits = 4 :: Int main = bullsAndCows bullsAndCows :: IO ()bullsAndCows = do digits <- getStdRandom$ pick numberOfDigits ['1' .. '9']    putStrLn "Guess away!"    loop digits   where loop digits = do            input <- getLine            if okay input              then                  let (bulls, cows) = score digits input in                  if bulls == numberOfDigits then                      putStrLn "You win!"                  else do                      printf "%d bulls, %d cows.\n" bulls cows                      loop digits              else do                  putStrLn "Malformed guess; try again."                  loop digits         okay :: String -> Bool        okay input =            length input == numberOfDigits &&             input == nub input &&            all legalchar input          where legalchar c = '1' <= c && c <= '9'         score :: String -> String -> (Int, Int)        score secret guess = (length bulls, cows)          where (bulls, nonbulls) = partition (uncurry (==)) $zip secret guess cows = length$ uncurry intersect $unzip nonbulls pick :: Int -> [a] -> StdGen -> ([a], StdGen){- Randomly selects items from a list without replacement. -}pick n l g = f n l g (length l - 1) [] where f 0 _ g _ ps = (ps, g) f n l g max ps = f (n - 1) (left ++ right) g' (max - 1) (picked : ps) where (i, g') = randomR (0, max) g (left, picked : right) = splitAt i l ## Hy (import random) (def +size+ 4)(def +digits+ "123456789")(def +secret+ (random.sample +digits+ +size+)) (while True (while True (setv guess (list (distinct (raw-input "Enter a guess: ")))) (when (and (= (len guess) +size+) (all (map (fn [c] (in c +digits+)) guess))) (break)) (print "Malformed guess; try again")) (setv bulls 0) (setv cows 0) (for [i (range +size+)] (cond [(= (get guess i) (get +secret+ i)) (setv bulls (inc bulls))] [(in (get guess i) +secret+) (setv cows (inc cows))])) (when (= bulls +size+) (break)) (print (.format "{} bull{}, {} cows" bulls (if (= bulls 1) "" "s") cows (if (= cows 1) "" "s")))) (print "A winner is you!") ## Icon and Unicon The following works in both Icon and Unicon. procedure main() digits := "123456789" every !digits :=: ?digits num := digits[1+:4] repeat if score(num, getGuess(num)) then break write("Good job.")end procedure getGuess(num) repeat { writes("Enter a guess: ") guess := read() | stop("Quitter!") if *(guess ** '123456789') == *num then return guess write("Malformed guess: ",guess,". Try again.") }end procedure score(num, guess) bulls := 0 cows := *(num ** guess) every (num[i := 1 to *num] == guess[i], bulls +:= 1, cows -:= 1) write("\t",bulls," bulls and ",cows," cows") return (bulls = *num)end ## J require 'misc' plural=: conjunction define (":m),' ',n,'s'#~1~:m) bullcow=:monad define number=. 1+4?9 whilst. -.guess-:number do. guess=. 0 "."0 prompt 'Guess my number: ' if. (4~:#guess)+.(4~:#~.guess)+.0 e.guess e.1+i.9 do. if. 0=#guess do. smoutput 'Giving up.' return. end. smoutput 'Guesses must be four different non-zero digits' continue. end. bulls=. +/guess=number cows=. (+/guess e.number)-bulls smoutput bulls plural 'bull',' and ',cows plural 'cow','.' end. smoutput 'you win') For example:  bullcow''Guess my number: 12340 bulls and 1 cow.Guess my number: 56783 bulls and 0 cows.Guess my number: 23490 bulls and 0 cows.Guess my number: 15670 bulls and 3 cows.Guess my number: 61783 bulls and 0 cows.Guess my number: 61571 bull and 2 cows.Guess my number: 51784 bulls and 0 cows.you win ## Java import java.util.InputMismatchException;import java.util.Random;import java.util.Scanner; public class BullsAndCows{ public static void main(String[] args){ Random gen= new Random(); int target= 0; while(hasDupes(target= (gen.nextInt(9000) + 1000))); String targetStr = target +""; boolean guessed = false; Scanner input = new Scanner(System.in); int guesses = 0; do{ int bulls = 0; int cows = 0; System.out.print("Guess a 4-digit number with no duplicate digits: "); int guess; try{ guess = input.nextInt(); if(hasDupes(guess) || guess < 1000) continue; }catch(InputMismatchException e){ continue; } guesses++; String guessStr = guess + ""; for(int i= 0;i < 4;i++){ if(guessStr.charAt(i) == targetStr.charAt(i)){ bulls++; }else if(targetStr.contains(guessStr.charAt(i)+"")){ cows++; } } if(bulls == 4){ guessed = true; }else{ System.out.println(cows+" Cows and "+bulls+" Bulls."); } }while(!guessed); System.out.println("You won after "+guesses+" guesses!"); } public static boolean hasDupes(int num){ boolean[] digs = new boolean; while(num > 0){ if(digs[num%10]) return true; digs[num%10] = true; num/= 10; } return false; }} Output: Guess a 4-digit number with no duplicate digits: 5834 2 Cows and 0 Bulls. Guess a 4-digit number with no duplicate digits: 1234 1 Cows and 0 Bulls. Guess a 4-digit number with no duplicate digits: 4321 1 Cows and 0 Bulls. Guess a 4-digit number with no duplicate digits: 3421 0 Cows and 1 Bulls. Guess a 4-digit number with no duplicate digits: 8412 0 Cows and 0 Bulls. Guess a 4-digit number with no duplicate digits: 3560 1 Cows and 1 Bulls. Guess a 4-digit number with no duplicate digits: 3650 0 Cows and 2 Bulls. Guess a 4-digit number with no duplicate digits: 3759 2 Cows and 2 Bulls. Guess a 4-digit number with no duplicate digits: 3975 2 Cows and 2 Bulls. Guess a 4-digit number with no duplicate digits: 3957 You won after 10 guesses! ## JavaScript ### Spidermonkey version #!/usr/bin/env js function main() { var len = 4; playBullsAndCows(len);} function playBullsAndCows(len) { var num = pickNum(len); // print('The secret number is:\n ' + num.join('\n ')); showInstructions(len); var nGuesses = 0; while (true) { nGuesses++; var guess = getGuess(nGuesses, len); var census = countBovine(num, guess); showScore(census.bulls, census.cows); if (census.bulls == len) { showFinalResult(nGuesses); return; } }} function showScore(nBulls, nCows) { print(' Bulls: ' + nBulls + ', cows: ' + nCows);} function showFinalResult(guesses) { print('You win!!! Guesses needed: ' + guesses);} function countBovine(num, guess) { var count = {bulls:0, cows:0}; var g = guess.join(''); for (var i = 0; i < num.length; i++) { var digPresent = g.search(num[i]) != -1; if (num[i] == guess[i]) count.bulls++; else if (digPresent) count.cows++; } return count;} function getGuess(nGuesses, len) { while (true) { putstr('Your guess #' + nGuesses + ': '); var guess = readline(); guess = String(parseInt(guess)).split(''); if (guess.length != len) { print(' You must enter a ' + len + ' digit number.'); continue; } if (hasDups(guess)) { print(' No digits can be duplicated.'); continue; } return guess; }} function hasDups(ary) { var t = ary.concat().sort(); for (var i = 1; i < t.length; i++) { if (t[i] == t[i-1]) return true; } return false;} function showInstructions(len) { print(); print('Bulls and Cows Game'); print('-------------------'); print(' You must guess the ' + len + ' digit number I am thinking of.'); print(' The number is composed of the digits 1-9.'); print(' No digit appears more than once.'); print(' After each of your guesses, I will tell you:'); print(' The number of bulls (digits in right place)'); print(' The number of cows (correct digits, but in the wrong place)'); print();} function pickNum(len) { var nums = [1, 2, 3, 4, 5, 6, 7, 8, 9]; nums.sort(function(){return Math.random() - 0.5}); return nums.slice(0, len);} main();  Example game (cheating!): Bulls and Cows Game ------------------- You must guess the 4 digit number I am thinking of. The number is composed of the digits 1-9. No digit appears more than once. After each of your guesses, I will tell you: The number of bulls (digits in right place) The number of cows (correct digits, but in wrong place) Your guess #1: 1234 Bulls: 0, cows: 2 Your guess #2: 5678 Bulls: 1, cows: 1 Your guess #3: 3167 Bulls: 0, cows: 3 Your guess #4: 9123 Bulls: 1, cows: 1 Your guess #5: 5137 Bulls: 1, cows: 3 Your guess #6: 5317 Bulls: 2, cows: 2 Your guess #7: 5731 Bulls: 2, cows: 2 Your guess #8: 5713 Bulls: 4, cows: 0 You win! Guesses needed: 8  ## Julia function cowsbulls() print("Welcome to Cows & Bulls! I've picked a number with unique digits between 1 and 9, go ahead and type your guess.\n You get one bull for every right number in the right position.\n You get one cow for every right number, but in the wrong position.\n Enter 'n' to pick a new number and 'q' to quit.\n>") function new_number() s = [1:9] n = "" for i = 9:-1:6 n *= string(delete!(s,rand(1:i))) end return n end answer = new_number() while true input = chomp(readline(STDIN)) input == "q" && break if input == "n" answer = new_number() print("\nI've picked a new number, go ahead and guess\n>") continue end !ismatch(r"^[1-9]{4}$",input) && (print("Invalid guess: Please enter a 4-digit number\n>"); continue)		if input == answer 			print("\nYou're right! Good guessing!\nEnter 'n' for a new number or 'q' to quit\n>")		else			bulls = sum(answer.data .== input.data)			cows = sum([answer[x] != input[x] && contains(input.data,answer[x]) for x = 1:4])			print("\nNot quite! Your guess is worth:\n$bulls Bulls\n$cows Cows\nPlease guess again\n\n>")		end	endend

The following version checks thoroughly that the input of the player is constituted of four distincts digits.

function bullsandcows ()    bulls = cows = turns = 0    result = (s = [] ; while length(unique(s))<4 push!(s,rand('1':'9')) end; unique(s))    println("A game of bulls and cows!")    while (bulls != 4)      print("Your guess? ")      guess = collect(chomp(readline(STDIN)))      if ! (length(unique(guess)) == length(guess) == 4 && all(isdigit,guess))         println("please, enter four distincts digits")          continue       end      bulls = sum(map(==, guess, result))      cows = length(intersect(guess,result)) - bulls      println("$bulls bulls and$cows cows!") ; turns += 1    end    println("You win! You succeeded in $turns guesses.") end Output: julia> bullsandcows() A game of bulls and cows! Your guess? 1234 0 bulls and 2 cows! Your guess? 12334 please, enter four distincts digits Your guess? 5678 1 bulls and 1 cows! Your guess? 1111 please, enter four distincts digits Your guess? grr please, enter four distincts digits Your guess? ... please, enter four distincts digits Your guess?  ## Kotlin // version 1.1.2 import java.util.Random const val MAX_GUESSES = 20 // say fun main(args: Array<String>) { val r = Random() var num: String // generate a 4 digit random number from 1234 to 9876 with no zeros or repeated digits do { num = (1234 + r.nextInt(8643)).toString() } while ('0' in num || num.toSet().size < 4) println("All guesses should have exactly 4 distinct digits excluding zero.") println("Keep guessing until you guess the chosen number (maximum$MAX_GUESSES valid guesses).\n")    var guesses = 0    while (true) {        print("Enter your guess : ")        val guess = readLine()!!        if (guess == num) {            println("You've won with ${++guesses} valid guesses!") return } val n = guess.toIntOrNull() if (n == null) println("Not a valid number") else if ('-' in guess || '+' in guess) println("Can't contain a sign") else if ('0' in guess) println("Can't contain zero") else if (guess.length != 4) println("Must have exactly 4 digits") else if (guess.toSet().size < 4) println("All digits must be distinct") else { var bulls = 0 var cows = 0 for ((i, c) in guess.withIndex()) { if (num[i] == c) bulls++ else if (c in num) cows++ } println("Your score for this guess: Bulls =$bulls  Cows = $cows") guesses++ if (guesses == MAX_GUESSES) println("You've now had$guesses valid guesses, the maximum allowed")         }    }}

Sample input/output:

Output:
Enter your guess : 1234
Your score for this guess:  Bulls = 0  Cows = 2
Enter your guess : 1256
Your score for this guess:  Bulls = 0  Cows = 2
Enter your guess : 2178
Your score for this guess:  Bulls = 1  Cows = 0
Enter your guess : 2519
Your score for this guess:  Bulls = 3  Cows = 0
Enter your guess : 2569
Your score for this guess:  Bulls = 3  Cows = 0
Enter your guess : 2579
Your score for this guess:  Bulls = 3  Cows = 0
Enter your guess : 2589
Your score for this guess:  Bulls = 3  Cows = 0
Enter your guess : 2539
Your score for this guess:  Bulls = 3  Cows = 0
Enter your guess : 2549
You've won with 9 valid guesses!


## Lasso

This game uses an HTML form to submit the answer. The random number and history are stored in a session using Lasso's built in session management.

[define randomizer() => {	local(n = string)	while(#n->size < 4) => {		local(r = integer_random(1,9)->asString)		#n !>> #r ? #n->append(#r)	}	return #n}define cowbullchecker(n::string,a::string) => {	integer(#n) == integer(#a) ? return (:true,map('cows'=0,'bulls'=4,'choice'=#a))	local(cowbull = map('cows'=0,'bulls'=0,'choice'=#a),'checked' = array)	loop(4) => {		if(#checked !>> integer(#a->values->get(loop_count))) => {			#checked->insert(integer(#a->values->get(loop_count)))			if(integer(#n->values->get(loop_count)) == integer(#a->values->get(loop_count))) => {				#cowbull->find('bulls') += 1			else(#n->values >> #a->values->get(loop_count))				#cowbull->find('cows') += 1			}		}	}	#cowbull->find('bulls') == 4 ? return (:true,map('cows'=0,'bulls'=4,'choice'=#a)) 	return (:true,#cowbull) }session_start('user')session_addvar('user', 'num')session_addvar('user', 'historic_choices')// set up randvar(num)->isNotA(::string) ? var(num = randomizer)var(historic_choices)->isNotA(::array) ? var(historic_choices = array)local(success = false)// check answerif(web_request->param('a')->asString->size) => {	local(success,result) = cowbullchecker($num,web_request->param('a')->asString)$historic_choices->insert(#result)}if(web_request->params->asStaticArray >> 'restart') => {	$num = randomizer$historic_choices = array}]<h1>Bulls and Cows</h1><p>Guess the 4-digit number...</p><p>Your win if the guess is the same as the randomly chosen number.<br>- A score of one bull is accumulated for each digit in your guess that equals the corresponding digit in the randomly chosen initial number.<br>- A score of one cow is accumulated for each digit in your guess that also appears in the randomly chosen number, but in the wrong position.</p>[local(win = false)if($historic_choices->size) => { with c in$historic_choices do => {^		'<p>'+#c->find('choice')+': Bulls: '+#c->find('bulls')+', Cows: '+#c->find('cows')		if(#c->find('bulls') == 4) => {^			' - YOU WIN!'			#win = true		^}		'</p>'	^}}if(not #win) => {^]<form action="?" method="post">	<input name="a" value="[web_request->param('a')->asString]" size="5">	<input type="submit" name="guess">	<a href="?restart">Restart</a></form>[else	'<a href="?restart">Restart</a>'^}] 
Output:

Game in progress:

Bulls and Cows

Guess the 4-digit number...

Your win if the guess is the same as the randomly chosen number.
- A score of one bull is accumulated for each digit in your guess that equals the corresponding digit in the randomly chosen initial number.
- A score of one cow is accumulated for each digit in your guess that also appears in the randomly chosen number, but in the wrong position.

4567: Bulls: 0, Cows: 1
4567: Bulls: 0, Cows: 1

(input box) (submit button)   Restart
Output:

Game in to completion:

Bulls and Cows

Guess the 4-digit number...

Your win if the guess is the same as the randomly chosen number.
- A score of one bull is accumulated for each digit in your guess that equals the corresponding digit in the randomly chosen initial number.
- A score of one cow is accumulated for each digit in your guess that also appears in the randomly chosen number, but in the wrong position.

1234: Bulls: 0, Cows: 2
1256: Bulls: 0, Cows: 1
1789: Bulls: 0, Cows: 1
1222: Bulls: 0, Cows: 0
3456: Bulls: 1, Cows: 2
3564: Bulls: 0, Cows: 3
3567: Bulls: 0, Cows: 2
8564: Bulls: 0, Cows: 2
3564: Bulls: 0, Cows: 3
4365: Bulls: 0, Cows: 3
5436: Bulls: 2, Cows: 1
5478: Bulls: 2, Cows: 0
5463: Bulls: 3, Cows: 0
5468: Bulls: 2, Cows: 0
5493: Bulls: 4, Cows: 0 - YOU WIN!
Restart

      do while len( secret$) <4 c$ =chr$( int( rnd( 1) *9) +49) if not( instr( secret$, c$)) then secret$ =secret$+c$    loop     print " Secret number has been guessed....                                                                                 "; secret$guesses = 0 [loop] print " Your guess "; input " "; guess$     guesses  = guesses +1     r$=score$( guess$, secret$)     bulls    =val( word$( r$, 1, ","))    cows     =val( word$( r$, 2, ","))     print "   Result: "; bulls; " bulls, and "; cows; " cows"    print     if guess$=secret$ then        print "  You won after "; guesses; " guesses!"        print "  You guessed it in "; guesses        print "  Thanks for playing!"        wait    end if     goto [loop] end '   _____________________________________________________________ function check( i$) ' check =0 if no digit repeats, else =1 check =0 for i =1 to 3 for j =i +1 to 4 if mid$( i$, i, 1) =mid$( i$, j, 1) then check =1 next j next iend function function score$( a$, b$)    '   return as a csv string the number of bulls & cows.    bulls    = 0:  cows     = 0    for i = 1 to 4        c$= mid$( a$, i, 1) if mid$( b$, i, 1) = c$ then            bulls = bulls + 1        else            if instr( b$, c$) <>0 and instr( b$, c$) <>i then                cows = cows + 1            end if        end if    next i    score$=str$( bulls); ","; str$( cows)end function [quit]close #wend  ## Logo Works with: UCB Logo to ok? :n output (and [number? :n] [4 = count :n] [4 = count remdup :n] [not member? 0 :n])end to init do.until [make "hidden random 10000] [ok? :hidden]end to guess :n if not ok? :n [print [Bad guess! (4 unique digits, 1-9)] stop] localmake "bulls 0 localmake "cows 0 foreach :n [cond [ [[? = item # :hidden] make "bulls 1 + :bulls] [[member? ? :hidden] make "cows 1 + :cows ] ]] (print :bulls "bulls, :cows "cows) if :bulls = 4 [print [You guessed it!]]end ## Lua function ShuffleArray(array) for i=1,#array-1 do local t = math.random(i, #array) array[i], array[t] = array[t], array[i] endend function GenerateNumber() local digits = {1,2,3,4,5,6,7,8,9} ShuffleArray(digits) return digits * 1000 + digits * 100 + digits * 10 + digitsend function IsMalformed(input) local malformed = false if #input == 4 then local already_used = {} for i=1,4 do local digit = input:byte(i) - string.byte('0') if digit < 1 or digit > 9 or already_used[digit] then malformed = true break end already_used[digit] = true end else malformed = true end return malformedend math.randomseed(os.time())math.randomseed(math.random(2^31-1)) -- since os.time() only returns seconds print("\nWelcome to Bulls and Cows!")print("")print("The object of this game is to guess the random 4-digit number that the")print("computer has chosen. The number is generated using only the digits 1-9,")print("with no repeated digits. Each time you enter a guess, you will score one")print("\"bull\" for each digit in your guess that matches the corresponding digit")print("in the computer-generated number, and you will score one \"cow\" for each")print("digit in your guess that appears in the computer-generated number, but is")print("in the wrong position. Use this information to refine your guesses. When")print("you guess the correct number, you win.");print("") quit = false repeat magic_number = GenerateNumber() magic_string = tostring(magic_number) -- Easier to do scoring with a string repeat io.write("\nEnter your guess (or 'Q' to quit): ") user_input = io.read() if user_input == 'Q' or user_input == 'q' then quit = true break end if not IsMalformed(user_input) then if user_input == magic_string then print("YOU WIN!!!") else local bulls, cows = 0, 0 for i=1,#user_input do local find_result = magic_string:find(user_input:sub(i,i)) if find_result and find_result == i then bulls = bulls + 1 elseif find_result then cows = cows + 1 end end print(string.format("You scored %d bulls, %d cows", bulls, cows)) end else print("Malformed input. You must enter a 4-digit number with") print("no repeated digits, using only the digits 1-9.") end until user_input == magic_string if not quit then io.write("\nPress <Enter> to play again or 'Q' to quit: ") user_input = io.read() if user_input == 'Q' or user_input == 'q' then quit = true end end if quit then print("\nGoodbye!") enduntil quit ## M2000 Interpreter  Module Game { Malformed=lambda (a$)->{            =true            if len(a$)<>4 then exit n=0 : dummy=val(a$,"int",n)            if n<>5 or dummy=0 then exit            for i=1 to 9                   if len(filter$(a$,str$(i,0)))<3 then break next i =false } BullsAndCows$=lambda$(a$, b$, &ok) ->{ Def b, c for i=1 to 4 if mid$(a$,i,1)=mid$(b$,i,1) then b++ else.if instr(b$,mid$(a$,i,1))>0 then                  c++            end if            next i            ok=b=4            =format$("bulls {0}, cows {1}", b, c) } Random$=lambda$->{ def repl$, bank$, c$            bank$="123456789" for i=1 to 4 c$=mid$(bank$,random(1,len(bank$)),1) bank$=filter$(bank$, c$) repl$+=c$next i =repl$      }      target$=Random$()      def boolean win=false, a$do do Input "Next guess ";a% a$=str$(a%,0) if Malformed(a$) then Print "Malformed input, try again" else exit            always            Print BullsAndCows$(a$, target$, &win) if win then exit Print "Bad guess! (4 unique digits, 1-9)" always Print "You guess it"}Game  ## Maple BC := proc(n) #where n is the number of turns the user wishes to play before they quit local target, win, numGuesses, guess, bulls, cows, i, err; target := [0, 0, 0, 0]: randomize(); #This is a command that makes sure that the numbers are truly randomized each time, otherwise your first time will always give the same result. while member(0, target) or numelems({op(target)}) < 4 do #loop continues to generate random numbers until you get one with no repeating digits or 0s target := [seq(parse(i), i in convert(rand(1234..9876)(), string))]: #a list of random numbers end do: win := false: numGuesses := 0: while win = false and numGuesses < n do #loop allows the user to play until they win or until a set amount of turns have passed err := true; while err do #loop asks for values until user enters a valid number printf("Please enter a 4 digit integer with no repeating digits\n"); try#catches any errors in user input guess := [seq(parse(i), i in readline())]; if hastype(guess, 'Not(numeric)', 'exclude_container') then printf("Postive integers only! Please guess again.\n\n"); elif numelems(guess) <> 4 then printf("4 digit numbers only! Please guess again.\n\n"); elif numelems({op(guess)}) < 4 then printf("No repeating digits! Please guess again.\n\n"); elif member(0, guess) then printf("No 0s! Please guess again.\n\n"); else err := false; end if; catch: printf("Invalid input. Please guess again.\n\n"); end try; end do: numGuesses := numGuesses + 1; printf("Guess %a: %a\n", numGuesses, guess); bulls := 0; cows := 0; for i to 4 do #loop checks for bulls and cows in the user's guess if target[i] = guess[i] then bulls := bulls + 1; elif member(target[i], guess) then cows := cows + 1; end if; end do; if bulls = 4 then win := true; printf("The number was %a.\n", target); printf(StringTools[FormatMessage]("You won with %1 %{1|guesses|guess|guesses}.", numGuesses)); else printf(StringTools[FormatMessage]("%1 %{1|Cows|Cow|Cows}, %2 %{2|Bulls|Bull|Bulls}.\n\n", cows, bulls)); end if; end do: if win = false and numGuesses >= n then printf("You lost! The number was %a.\n", target); end if; return NULL;end proc: Output: Please enter a 4 digit integer with no repeating digits Guess 1: [1, 2, 3, 4] 1 Cow, 1 Bull. Please enter a 4 digit integer with no repeating digits Guess 2: [2, 3, 4, 5] 0 Cows, 1 Bull. ...  ## Mathematica  [email protected][If[[email protected]@#==4,#,Table[Random[Integer,{1,9}],{4}]]&,{}]codes=ToCharacterCode[StringJoin[ToString/@digits]];Module[{r,bulls,cows}, While[True, r=InputString[]; If[r===$Canceled,Break[],		With[{[email protected]},		If[userCodes===codes,Print[r<>": You got it!"];Break[],			If[[email protected][email protected],				bulls=Count[userCodes-codes,0];[email protected][codes,userCodes]-bulls;				Print[r<>": "<>ToString[bulls]<>"bull(s), "<>[email protected]<>"cow(s)."],				Print["Guess four digits."]]]]]]] 

Output:

{8, 2, 6, 1}
3432: 0 bull(s), 1 cow(s).
Illegal input.
8261: You got it!


## MATLAB

function BullsAndCows% Plays the game Bulls and Cows as the "game master"     % Create a secret number    nDigits = 4;    lowVal = 1;    highVal = 9;    digitList = lowVal:highVal;    secret = zeros(1, 4);    for k = 1:nDigits        idx = randi(length(digitList));        secret(k) = digitList(idx);        digitList(idx) = [];    end     % Give game information    fprintf('Welcome to Bulls and Cows!\n')    fprintf('Try to guess the %d-digit number (no repeated digits).\n', nDigits)    fprintf('Digits are between %d and %d (inclusive).\n', lowVal, highVal)    fprintf('Score: 1 Bull per correct digit in correct place.\n')    fprintf('       1 Cow per correct digit in incorrect place.\n')    fprintf('The number has been chosen. Now it''s your moooooove!\n')    gs = input('Guess: ', 's');     % Loop until user guesses right or quits (no guess)    nGuesses = 1;    while gs        gn = str2double(gs);        if isnan(gn) || length(gn) > 1  % Not a scalar            fprintf('Malformed guess. Keep to valid scalars.\n')            gs = input('Try again: ', 's');        else            g = sprintf('%d', gn) - '0';            if length(g) ~= nDigits || any(g < lowVal) || any(g > highVal) || ...                    length(unique(g)) ~= nDigits    % Invalid number for game                fprintf('Malformed guess. Remember:\n')                fprintf('  %d digits\n', nDigits)                fprintf('  Between %d and %d inclusive\n', lowVal, highVal)                fprintf('  No repeated digits\n')                gs = input('Try again: ', 's');            else                score = CountBullsCows(g, secret);                if score(1) == nDigits                    fprintf('You win! Bully for you! Only %d guesses.\n', nGuesses)                    gs = '';                else                    fprintf('Score: %d Bulls, %d Cows\n', score)                    gs = input('Guess: ', 's');                end            end        end        nGuesses = nGuesses+1;  % Counts malformed guesses    endend function score = CountBullsCows(guess, correct)% Checks the guessed array of digits against the correct array to find the score% Assumes arrays of same length and valid numbers    bulls = guess == correct;    cows = ismember(guess(~bulls), correct);    score = [sum(bulls) sum(cows)];end
Output:
Welcome to Bulls and Cows!
Try to guess the 4-digit number (no repeated digits).
Digits are between 1 and 9 (inclusive).
Score: 1 Bull per correct digit in correct place.
1 Cow per correct digit in incorrect place.
The number has been chosen. Now it's your moooooove!
Guess: 1234
Score: 0 Bulls, 2 Cows
Guess: 2156
Score: 0 Bulls, 1 Cows
Guess: 7819
Score: 0 Bulls, 1 Cows
Guess: 3457
Score: 0 Bulls, 2 Cows
Guess: hello
Malformed guess. Keep to valid scalars.
Try again: 1123
Malformed guess. Remember:
4 digits
Between 1 and 9 inclusive
No repeated digits
Try again: 34567
Malformed guess. Remember:
4 digits
Between 1 and 9 inclusive
No repeated digits
Try again: 4368
You win! Bully for you! Only 8 guesses.

## MAXScript

 numCount = 4 -- number of digits to use digits = #(1, 2, 3, 4, 5, 6, 7, 8, 9)num = ""while num.count < numCount and digits.count > 0 do(	local r = random 1 digits.count	append num (digits[r] as string)	deleteitem digits r)digits = undefinednumGuesses = 0inf = "Rules: \n1. Choose only % unique digits in any combination"+\		" (0 can't be used).\n2. Only positive integers are allowed."+\		"\n3. For each digit that is in it's place, you get a bull,\n"+\		"\tand for each digit that is not in it's place, you get a cow."+\		"\n4. The game is won when your number matches the number I chose."+\		"\n\nPress [esc] to quit the game.\n\n"clearlistener()format inf num.countwhile not keyboard.escpressed do(	local userVal = getkbvalue prompt:"\nEnter your number: "	if (userVal as string) == num do	(		format "\nCorrect! The number is %. It took you % moves.\n" num numGuesses		exit with OK	)	local bulls = 0	local cows = 0	local badInput = false	case of	(		(classof userVal != integer): 			(			format "\nThe number must be a positive integer.\n"			badInput = true			)		((userVal as string).count != num.count): 			(			format "\nThe number must have % digits.\n" num.count			badInput = true			)		((makeuniquearray (for i in 1 to (userVal as string).count \			collect (userVal as string)[i])).count != (userVal as string).count):			(				format "\nThe number can only have unique digits.\n"				badInput = true			)	)	if not badInput do	(		userVal = userVal as string		i = 1		while i <= userVal.count do		(			for j = 1 to num.count do			(				if userVal[i] == num[j] do				(					if i == j then bulls += 1 else cows += 1				)			)			i += 1		)		numGuesses += 1		format "\nBulls: % Cows: %\n" bulls cows	))
Output:
 OKRules: 1. Choose only 4 unique digits in any combination (0 can't be used).2. Only positive integers are allowed.3. For each digit that is in it's place, you get a bull,	and for each digit that is not in it's place, you get a cow.4. The game is won when your number matches the number I chose. Press [esc] to quit the game. OK Enter your number:  2468Bulls: 0 Cows: 2 Enter your number:  2448The number can only have unique digits. Enter your number:  1357Bulls: 0 Cows: 1 

## MiniScript

secret = range(1,9)secret.shufflesecret = secret[:4].join("") while true    guess = input("Your guess? ").split("")    if guess.len != 4 then        print "Please enter 4 numbers, with no spaces."        continue    end if    bulls = 0    cows = 0    for i in guess.indexes        if secret[i] == guess[i] then            bulls = bulls + 1        else if secret.indexOf(guess[i]) != null then            cows = cows + 1        end if    end for    if bulls == 4 then        print "You got it!  Great job!"        break    end if    print "You score " + bulls + " bull" + "s"*(bulls!=1) +     " and " + cows + " cow" + "s"*(cows!=1) + "."end while
Output:
Your guess? 2385
You score 0 bulls and 2 cows.
Your guess? 2323
You score 0 bulls and 2 cows.
Your guess? 2211
You score 2 bulls and 1 cow.
...
Your guess? 8542
You score 3 bulls and 0 cows.
Your guess? 8642
You got it!  Great job!

## Red

 Red[]a: "0123456789"bulls: 0random/seed now/timenumber: copy/part random a 4while [bulls <> 4] [	bulls: 0	cows: 0	guess: ask "make a guess: "	repeat i 4 [		if (pick guess i) = (pick number i) [bulls: bulls + 1]	]	cows: (length? intersect guess number) - bulls	print ["bulls: " bulls " cows: " cows]]print "You won!"

## REXX

This game is also known as:

• Pigs and Bulls
• Bulls and Cleots
• Mastermind
• Master Mind

### version 1

This REXX version of Bulls and Cows doesn't allow repeated digits (in the computer-generated number),
nor the use of the zero digit.

To allow a zero digit, change the   1   on the 2nd REXX statement for the   random   BIF invocation.
To allow repeated digits in the computer-generated number, delete the 3rd REXX statement     if pos(r, ?)···,
and also change the prompt message.
The REXX statement that contains the   translate   statement can be removed if repeated digits aren't allowed.

/*REXX program scores the   Bulls & Cows   game with  CBLFs  (Carbon Based Life Forms). */?=; do  until length(?)==4;   r= random(1, 9)  /*generate a unique four-digit number.   */    if pos(r,?)\==0  then iterate;  ?= ? || r  /*don't allow a repeated digit/numeral.  */    end   /*until length*/                     /* [↑]  builds a unique four-digit number*/$= '──────── [Bulls & Cows] ' /*a literal that is part of the prompt. */ do until bulls==4; say /*play until guessed or enters "Quit".*/ say$  'Please enter a 4-digit guess (with no zeroes)   [or Quit]:'    pull n;  n=space(n, 0);   if abbrev('QUIT', n, 1)  then exit   /*user wants to quit?*/    q=?;   L= length(n);   bulls= 0;   cows= 0 /*initialize some REXX variables.        */        do j=1  for L;    if substr(n, j, 1)\==substr(q, j, 1)  then iterate  /*is bull?*/        bulls= bulls +1;  q= overlay(., q, j)  /*bump the bull count;  disallow for cow.*/        end   /*j*/                            /* [↑]  bull count───────────────────────*/                                                                              /*is cow? */        do k=1  for L;   _= substr(n, k, 1);           if pos(_, q)==0  then iterate        cows=cows + 1;   q= translate(q, , _)  /*bump the cow count;  allow mult digits.*/        end   /*k*/                            /* [↑]  cow  count───────────────────────*/    say;                  @= 'You got'   bulls    if L\==0  &  bulls\==4  then say $@ 'bull's(bulls) "and" cows 'cow's(cows). end /*until bulls*/ say " ┌─────────────────────────────────────────┐" say " │ │" say " │ Congratulations, you've guessed it !! │" say " │ │" say " └─────────────────────────────────────────┘"exit /*stick a fork in it, we're all done. *//*──────────────────────────────────────────────────────────────────────────────────────*/s: if arg(1)==1 then return ''; return "s" /*this function handles pluralization. */ ### Version 2  /*REXX program to play the game of "Bulls & Cows". ******************** Changes from Version 1:* ?= -> qq='' (righthandside mandatory and I never use ? as symbol -* although it is available on all Rexxes)* implemented singular/plural distinction differently* change getRand to avoid invalid digit rejection* check user's input for multiple digits* add feature MM to ease guessing (MM=Mastermind - a similar game)* add feature ? to see the solution (for the impatient player)* program runs as is on ooRexx and on TSO (after changing | to !)* Made source and output more compact* formatted source 'my way' 2 July 2012 Walter Pachl**********************************************************************/ask='<Bulls & Cows game> Please enter a four-digit guess (or QUIT):' b.='bulls'; b.1='bull'c.='cows'; c.1='cow'qq=getRand()mm=0Do Forever If get_guess()==qq Then leave Call scorer Say "You got" bulls b.bulls "and" cows c.cows"." If mm Then Say mms End /*forever*/Say " *******************************************"Say " * *"Say " * Congratulations, you've guessed it !! *"Say " * *"Say " *******************************************"Exit get_guess: /*get a guess from the guesser. */ do forever Say ask Parse Pull guessi guess=translate(guessi) bc=verify(guess,987654321) Select When guess='?' Then Say qq 'is the correct sequence' When guess='QUIT' Then Exit When guess='MM' Then Do Say 'Mastermind output enabled' mm=1 End When guess='' Then Call ser 'no argument specified.' When words(guess)>1 Then Call ser 'too many arguments specified.' When verify(0,guess)=0 Then Call ser 'illegal digit: 0' When bc>0 Then Call ser 'illegal character:' substr(guessi,bc,1) When length(guess)<4 Then Call ser 'not enough digits' When length(guess)>4 Then Call ser 'too many digits' When dups(guess) Then Call ser '4 DIFFERENT digits, please' Otherwise Do /********** Say guess ************/ Return guess End End End getRand:digits='123456789'qq=''Do i=1 To 4 d=random(1,length(digits)) d=substr(digits,d,1) qq=qq||d digits=space(translate(digits,' ',d),0) /************ Say qq digits ************/ EndReturn qq scorer: g=qqmms='----'bulls=0Do j=1 for 4 If substr(guess,j,1)=substr(qq,j,1) Then Do bulls=bulls+1 guess=overlay(' ',guess,j) mms=overlay('+',mms,j) End Endcows=0Do j=1 To 4 If pos(substr(guess,j,1),qq)>0 Then Do cows=cows+1 mms=overlay('.',mms,j) End EndReturn dups: ProcedureParse Arg sDo i=1 To 3 If pos(substr(s,i,1),substr(s,i+1))>0 Then Return 1 EndReturn 0 ser: Say '*** error ***' arg(1); Return  ## Ring  # Project : Bulls and cows secret = ""while len(secret) != 4 c = char(48 + random(9)) if substr(secret, c) = 0 secret = secret + c okend see "guess a four-digit number with no digit used twice."guesses = 0guess = ""while true guess = "" while len(guess) != 4 see "enter your guess: " give guess if len(guess) != 4 see "must be a four-digit number" + nl ok end guesses = guesses + 1 if guess = secret see "you won after " + guesses + " guesses!" exit ok bulls = 0 cows = 0 for i = 1 to 4 c = secret[i] if guess[i] = c bulls = bulls + 1 but substr(guess, c) > 0 cows = cows + 1 ok next see "you got " + bulls + " bull(s) and " + cows + " cow(s)." + nlend  ## Ruby Inspired by Tcl Works with: Ruby version 1.8.7+ def generate_word(len) [*"1".."9"].shuffle.first(len) # [*"1".."9"].sample(len) ver 1.9+end def get_guess(len) loop do print "Enter a guess: " guess = gets.strip err = case when guess.match(/[^1-9]/) ; "digits only" when guess.length != len ; "exactly #{len} digits" when guess.split("").uniq.length != len; "digits must be unique" else return guess.split("") end puts "the word must be #{len} unique digits between 1 and 9 (#{err}). Try again." endend def score(word, guess) bulls = cows = 0 guess.each_with_index do |num, idx| if word[idx] == num bulls += 1 elsif word.include? num cows += 1 end end [bulls, cows]end word_length = 4puts "I have chosen a number with #{word_length} unique digits from 1 to 9."word = generate_word(word_length)count = 0loop do guess = get_guess(word_length) count += 1 break if word == guess puts "that guess has %d bulls and %d cows" % score(word, guess)endputs "you guessed correctly in #{count} tries." Inspired by Python Works with: Ruby version 2.0+ size = 4secret = [*'1' .. '9'].sample(size)guess = nil i=0loop do i+=1 loop do print "Guess #{i}: " guess = gets.chomp.chars exit if guess.empty? break if guess.size == size and guess.all? { |x| ('1'..'9').include? x } and guess.uniq.size == size puts "Problem, try again. You need to enter #{size} unique digits from 1 to 9" end if guess == secret puts "Congratulations you guessed correctly in #{i} attempts" break end bulls = cows = 0 size.times do |j| if guess[j] == secret[j] bulls += 1 elsif secret.include? guess[j] cows += 1 end end puts "Bulls: #{bulls}; Cows: #{cows}"end ## Rust Library: rand use std::io;use rand::{Rng,thread_rng}; extern crate rand; const NUMBER_OF_DIGITS: usize = 4; static DIGITS: [char; 9] = ['1', '2', '3', '4', '5', '6', '7', '8', '9']; fn generate_digits() -> Vec<char> { let mut temp_digits: Vec<_> = (&DIGITS[..]).into(); thread_rng().shuffle(&mut temp_digits); return temp_digits.iter().take(NUMBER_OF_DIGITS).map(|&a| a).collect();} fn parse_guess_string(guess: &str) -> Result<Vec<char>, String> { let chars: Vec<char> = (&guess).chars().collect(); if !chars.iter().all(|c| DIGITS.contains(c)) { return Err("only digits, please".to_string()); } if chars.len() != NUMBER_OF_DIGITS { return Err(format!("you need to guess with {} digits", NUMBER_OF_DIGITS)); } let mut uniques: Vec<char> = chars.clone(); uniques.dedup(); if uniques.len() != chars.len() { return Err("no duplicates, please".to_string()); } return Ok(chars);} fn calculate_score(given_digits: &[char], guessed_digits: &[char]) -> (usize, usize) { let mut bulls = 0; let mut cows = 0; for i in 0..NUMBER_OF_DIGITS { let pos: Option<usize> = guessed_digits.iter().position(|&a| -> bool {a == given_digits[i]}); match pos { None => (), Some(p) if p == i => bulls += 1, Some(_) => cows += 1 } } return (bulls, cows);} fn main() { let reader = io::stdin(); loop { let given_digits = generate_digits(); println!("I have chosen my {} digits. Please guess what they are", NUMBER_OF_DIGITS); loop { let guess_string: String = { let mut buf = String::new(); reader.read_line(&mut buf).unwrap(); buf.trim().into() }; let digits_maybe = parse_guess_string(&guess_string); match digits_maybe { Err(msg) => { println!("{}", msg); continue; }, Ok(guess_digits) => { match calculate_score(&given_digits, &guess_digits) { (NUMBER_OF_DIGITS, _) => { println!("you win!"); break; }, (bulls, cows) => println!("bulls: {}, cows: {}", bulls, cows) } } } } }} ## Scala import scala.util.Random object BullCow { def main(args: Array[String]): Unit = { val number=chooseNumber var guessed=false var guesses=0 while(!guessed){ Console.print("Guess a 4-digit number with no duplicate digits: ") val input=Console.readInt val digits=input.toString.map(_.asDigit).toList if(input>=1111 && input<=9999 && !hasDups(digits)){ guesses+=1 var bulls, cows=0 for(i <- 0 to 3) if(number(i)==digits(i)) bulls+=1 else if(number.contains(digits(i))) cows+=1 if(bulls==4) guessed=true else println("%d Cows and %d Bulls.".format(cows, bulls)) } } println("You won after "+guesses+" guesses!"); } def chooseNumber={ var digits=List[Int]() while(digits.size<4){ val d=Random.nextInt(9)+1 if (!digits.contains(d)) digits=digits:+d } digits } def hasDups(input:List[Int])=input.size!=input.distinct.size} ## Scheme Works with: any R6RS Scheme  ;generate a random non-repeating list of 4 digits, 1-9 inclusive(define (get-num) (define (gen lst) (if (= (length lst) 4) lst (let ((digit (+ (random 9) 1))) (if (member digit lst) ;make sure the new digit isn't in the ;list (gen lst) (gen (cons digit lst)))))) (string->list (apply string-append (map number->string (gen '()))))) ;is g a valid guess (that is, non-repeating, four digits 1-9;inclusive?)(define (valid-guess? g) (let ((g-num (string->number (apply string g)))) ;does the same digit appear twice in lst? (define (repeats? lst) (cond ((null? lst) #f) ((member (car lst) (cdr lst)) #t) (else (repeats? (cdr lst))))) (and g-num (> g-num 1233) (< g-num 9877) (not (repeats? g))))) ;return '(cows bulls) for the given guess(define (score answer guess) ;total cows + bulls (define (cows&bulls a g) (cond ((null? a) 0) ((member (car a) g) (+ 1 (cows&bulls (cdr a) g))) (else (cows&bulls (cdr a) g)))) ;bulls only (define (bulls a g) (cond ((null? a) 0) ((equal? (car a) (car g)) (+ 1 (bulls (cdr a) (cdr g)))) (else (bulls (cdr a) (cdr g))))) (list (- (cows&bulls answer guess) (bulls answer guess)) (bulls answer guess))) ;play the game(define (bull-cow answer) ;get the user's guess as a list (define (get-guess) (let ((e (read))) (if (number? e) (string->list (number->string e)) (string->list (symbol->string e))))) (display "Enter a guess: ") (let ((guess (get-guess))) (if (valid-guess? guess) (let ((bulls (cadr (score answer guess))) (cows (car (score answer guess)))) (if (= bulls 4) (display "You win!\n") (begin (display bulls) (display " bulls, ") (display cows) (display " cows.\n") (bull-cow answer)))) (begin (display "Invalid guess.\n") (bull-cow answer))))) (bull-cow (get-num))  ### Sample game play Enter a guess: 1234 0 bulls, 1 cows. Enter a guess: 2345 1 bulls, 0 cows. Enter a guess: 2346 1 bulls, 1 cows. Enter a guess: 2367 0 bulls, 1 cows. Enter a guess: 2647 1 bulls, 1 cows. Enter a guess: 2648 2 bulls, 1 cows. Enter a guess: 2468 1 bulls, 2 cows. Enter a guess: 1468 1 bulls, 2 cows. Enter a guess: 2684 0 bulls, 3 cows. Enter a guess: 6248 3 bulls, 0 cows. Enter a guess: 6948 You win!  ## Scratch Scratch is a graphical programming language. Follow the link to see an example solution for Bulls and Cows Scratch - Bulls and Cows The program "says" the score of the current guess and uses a list to display previous guesses. Malformed guesses are rejected for the following reasons: • Guess is longer or shorter than 4 characters • Guess contains character other than the digits 1 - 9 • Guess contains a digit more than once (i.e. 3484 - this would be rejected because "4" appears in the guess two times) Since Scratch is an educational language, I've included comments in the code to explain what the program is doing. ## Seed7 $ include "seed7_05.s7i"; const proc: main is func  local    const integer: size is 4;    var set of char: digits is {'1' .. '9'};    var string: chosen is " " mult size;    var integer: guesses is 0;    var string: guess is "";    var integer: pos is 0;    var integer: bulls is 0;    var integer: cows is 0;    var boolean: okay is FALSE;  begin    for pos range 1 to 4 do      chosen @:= [pos] rand(digits);      excl(digits, chosen[pos]);    end for;    writeln("I have chosen a number from " <& size <& " unique digits from 1 to 9 arranged in a random order.");    writeln("You need to input a " <& size <& " digit, unique digit number as a guess at what I have chosen");    repeat      incr(guesses);      repeat        write("Next guess [" <& guesses <& "]: ");        readln(guess);        okay := length(guess) = size;        for key pos range guess do          okay := okay and guess[pos] in {'1' .. '9'} and pos(guess[succ(pos) ..], guess[pos]) = 0;        end for;        if not okay then          writeln("Problem, try again. You need to enter " <& size <& " unique digits from 1 to 9");        end if;      until okay;      if guess <> chosen then        bulls := 0;        cows := 0;        for key pos range chosen do          if guess[pos] = chosen[pos] then            incr(bulls);          elsif pos(chosen, guess[pos]) <> 0 then            incr(cows);          end if;        end for;        writeln("  " <& bulls <& " Bulls");        writeln("  " <& cows <& " Cows");      end if;    until guess = chosen;    writeln("Congratulations you guessed correctly in " <& guesses <& " attempts");  end func;
Output:
I have chosen a number from 4 unique digits from 1 to 9 arranged in a random order.
You need to input a 4 digit, unique digit number as a guess at what I have chosen
Next guess : 1234
1 Bulls
0 Cows
Next guess : 1567
1 Bulls
2 Cows
Next guess : 1856
3 Bulls
0 Cows
Next guess : 1956
Congratulations you guessed correctly in 4 attempts


## SenseTalk

repeat forever	repeat forever		put random(1111,9999) into num		if character 1 of num is not equal to character 2 of num			if character 1 of num is not equal to character 3 of num				if character 1 of num is not equal to character 4 of num					if character 2 of num is not equal to character 3 of num						if character 2 of num is not equal to character 4 of num							if character 3 of num is not equal to character 4 of num								if num does not contain 0									exit repeat								end if							end if						end if					end if				end if			end if		end if	end repeat	set description to "Guess the 4 digit number" & newline & "- zero's excluded" & newline & "- each digit is unique" & newline & newline & "Receive 1 Bull for each digit that equals the corresponding digit in the random number." & newline & newline & "Receive 1 Cow for each digit that appears in the wrong position." & newline	repeat forever		repeat forever			Ask "Guess the number" title "Bulls & Cows" message description			put it into guess			if number of characters in guess is equal to 4				exit repeat			else if guess is ""				Answer "" with "Play" or "Quit" title "Quit Bulls & Cows?"				put it into myAnswer				if myAnswer is "Quit"					exit all				end if			end if		end repeat		set score to {			bulls: {				qty: 0,				values: []			},			cows: {				qty: 0,				values: []			}		}		repeat the number of characters in num times			if character the counter of guess is equal to character the counter of num				add 1 to score.bulls.qty				insert character the counter of guess into score.bulls.values			else				if num contains character the counter of guess					if character the counter of guess is not equal to character the counter of num						if score.bulls.values does not contain character the counter of guess and score.cows.values does not contain character the counter of guess							add 1 to score.cows.qty							insert character the counter of guess into score.cows.values						end if						end if				end if			end if		end repeat		set showScores to "Your score is:" & newline & newline & "Bulls:" && score.bulls.qty & newline & newline & "Cows:" && score.cows.qty		if guess is not equal to num			Answer showScores with "Guess Again" or "Quit" title "Score"			put it into myAnswer			if myAnswer is "Quit"				exit all			end if		else			set winShowScores to showScores & newline & newline & "Your Guess:" && guess & newline & "Random Number:" && num & newline			Answer winShowScores with "Play Again" or "Quit" title "You Win!"			put it into myAnswer			if myAnswer is "Quit"				exit all			end if			exit repeat		end if	end repeatend repeat

## Shale

#!/usr/local/bin/shale maths libraryfile librarystring library n0 varn1 varn2 varn3 varg0 varg1 varg2 varg3 var init dup var {  c guess:: var} = getNum dup var {  random maths::() 15 >> 9 % 1 +} = game dup var {  haveWon dup var false =  ans var  i var  c var  b var   c guess:: 0 =   n0 getNum() =  n1 getNum() =  { n1 n0 == } {    n1 getNum() =  } while  n2 getNum() =  { n2 n0 == n2 n1 == or } {    n2 getNum() =  } while  n3 getNum() =  { n3 n0 == n3 n1 == n3 n2 == or or } {    n3 getNum() =  } while   "New game" println  { haveWon not } {    "> " print    stdin file:: fgets file::() {      ans swap atoi string::() =      g3 ans 10 % =      g2 ans 10 / 10 % =      g1 ans 100 / 10 % =      g0 ans 1000 / 10 % =      g0 0 > g0 10 < and g1 0 > g1 10 < and g2 0 > g2 10 < and g3 0 > g3 10 < and and and and {        c 0 =        b 0 =         g0 n0 == {          b++        } {          g0 n1 == g0 n2 == g0 n3 == or or { c++ } ifthen        } if         g1 n1 == {          b++        } {          g1 n0 == g1 n2 == g1 n3 == or or { c++ } ifthen        } if         g2 n2 == {          b++        } {          g2 n0 == g2 n1 == g2 n3 == or or { c++ } ifthen        } if         g3 n3 == {          b++        } {          g3 n0 == g3 n1 == g3 n2 == or or { c++ } ifthen        } if         i c guess:: =        i.value guess:: guess:: defined not {          i.value guess:: guess:: var          i.value cow:: guess:: var          i.value bull:: guess:: var        } ifthen        i.value guess:: guess:: ans =        i.value cow:: guess:: c =        i.value bull:: guess:: b =        c guess::++         "Go  Guess Cows Bulls" println        i 0 =        { i c guess:: < } {          i.value bull:: guess:: i.value cow:: guess:: i.value guess:: guess:: i 1 + "%2d  %d  %4d %5d\n" printf          i++        } while         b 4 == { haveWon true = } ifthen      } {        "Illegal input" println      } if    } {      0 exit    } if  } while } = play dup var {  { true } {    game()  } while} = init()play()
Output:
New game
> 1234
Go  Guess Cows Bulls
1  1234     2     0
> 2345
Go  Guess Cows Bulls
1  1234     2     0
2  2345     2     0
> 3456
Go  Guess Cows Bulls
1  1234     2     0
2  2345     2     0
3  3456     0     2
> 4567
Go  Guess Cows Bulls
1  1234     2     0
2  2345     2     0
3  3456     0     2
4  4567     1     0
> 5678
Go  Guess Cows Bulls
1  1234     2     0
2  2345     2     0
3  3456     0     2
4  4567     1     0
5  5678     1     1
> 6789
Go  Guess Cows Bulls
1  1234     2     0
2  2345     2     0
3  3456     0     2
4  4567     1     0
5  5678     1     1
6  6789     1     0
> 3158
Go  Guess Cows Bulls
1  1234     2     0
2  2345     2     0
3  3456     0     2
4  4567     1     0
5  5678     1     1
6  6789     1     0
7  3158     0     4
New game
>

## Smart BASIC

 'by rbytes, January 2017OPTION BASE 1P("  B U L L S   A N D    C O W S")!lP("A secret 4-digit number has been created, with")P("no repeats and no zeros. You must guess the number.")P("After each guess, you will be shown how many of your")P("digits are correct and in the matching location (bulls),")P("and how many are correct but in a different location (cows).")p("See how many tries it takes you to get the right answer.")' generate a 4-digit number with no repeatsguesses  =   01 WHILE LEN(sec$) <4 c$ =CHR$( INTEG(RND(1) *9) +49) IF INSTR(sec$, c$)=-1 THEN sec$&=c$ENDWHILE!l2 PRINT "Your guess: "INPUT "FOUR DIGITS": guess$!lIF guess$="" THEN ' check if entry is null P("Please enter something!")!l GOTO 2ENDIFP(guess$)!lIF LEN(guess$)<>4 THEN ' check if entry is exactly 4 characters P("Please enter exactly 4 digits.")!l GOTO 2ENDIFFOR t=1 TO 4 ' check if all characters are digits 1 - 9 IF INSTR("123456789",MID$(guess$,t,1))=-1 THEN P("You have entered at least one illegal character")!l GOTO 2 ENDIFNEXT trep = check(guess$)     ' check if any digits are repeatedIF check.chk THEN  P("Please enter a number with no repeated digits.")!l  GOTO 2ENDIF guesses+=1r$=score$(guess$,sec$)P(r$)!l IF guess$=sec$THEN P("W I N N E R ! ! !")!l IF guesses>1 THEN gs$="guesses!" ELSE gs$="guess!" P("You won after "&guesses&" "&gs$)  P("Thanks for playing!")!l  PAUSE 2  P("A G A I N  with a new secret number")!l  guesses=0END IFGOTO 1END '   _____________________________________________________________ DEF P(p$) ' function to print a string PRINT p$END DEF DEF L()                ' function to print an empty line  PRINTEND DEF DEF check(i$) ' check=0 if digit is not repeated, else=1 chk=0 FOR i =1 TO 3 FOR j =i +1 TO 4 IF MID$( i$, i, 1)=MID$( i$, j, 1) THEN chk =1 NEXT j NEXT iEND DEF DEF score$(a$,b$)      ' calculate the numbers of bulls & cows.  bulls=0!cows=0  FOR i = 1 TO 4    c$= MID$( a$, i, 1) IF MID$( b$, i, 1)=c$ THEN      bulls+=1    ELSE      IF INSTR( b$, c$) <>-1 AND INSTR( b$, c$) <>i THEN        cows+=1      END IF    END IF  NEXT i  r$="Bulls: "&STR$( bulls)& ", "& "Cows: " &STR$( cows) RETURN r$END DEFEND

## VBA

 Option Explicit Sub Main_Bulls_and_cows()Dim strNumber As String, strInput As String, strMsg As String, strTemp As StringDim boolEnd As BooleanDim lngCpt As LongDim i As Byte, bytCow As Byte, bytBull As ByteConst NUMBER_OF_DIGITS As Byte = 4Const MAX_LOOPS As Byte = 25 'the max of lines supported by MsgBox    strNumber = Create_Number(NUMBER_OF_DIGITS)    Do        bytBull = 0: bytCow = 0: lngCpt = lngCpt + 1        If lngCpt > MAX_LOOPS Then strMsg = "Max of loops... Sorry you loose!": Exit Do        strInput = AskToUser(NUMBER_OF_DIGITS)        If strInput = "Exit Game" Then strMsg = "User abort": Exit Do        For i = 1 To Len(strNumber)            If Mid(strNumber, i, 1) = Mid(strInput, i, 1) Then                bytBull = bytBull + 1            ElseIf InStr(strNumber, Mid(strInput, i, 1)) > 0 Then                bytCow = bytCow + 1            End If        Next i        If bytBull = Len(strNumber) Then            boolEnd = True: strMsg = "You win in " & lngCpt & " loops!"        Else            strTemp = strTemp & vbCrLf & "With : " & strInput & " ,you have : " & bytBull & " bulls," & bytCow & " cows."            MsgBox strTemp        End If    Loop While Not boolEnd    MsgBox strMsgEnd Sub Function Create_Number(NbDigits As Byte) As StringDim myColl As New CollectionDim strTemp As StringDim bytAlea As Byte     Randomize    Do        bytAlea = Int((Rnd * 9) + 1)        On Error Resume Next        myColl.Add CStr(bytAlea), CStr(bytAlea)        If Err <> 0 Then            On Error GoTo 0        Else            strTemp = strTemp & CStr(bytAlea)        End If    Loop While Len(strTemp) < NbDigits    Create_Number = strTempEnd Function Function AskToUser(NbDigits As Byte) As StringDim boolGood As Boolean, strIn As String, i As Byte, NbDiff As Byte     Do While Not boolGood        strIn = InputBox("Enter your number (" & NbDigits & " digits)", "Number")        If StrPtr(strIn) = 0 Then strIn = "Exit Game": Exit Do        If strIn <> "" Then            If Len(strIn) = NbDigits Then                NbDiff = 0                For i = 1 To Len(strIn)                    If Len(Replace(strIn, Mid(strIn, i, 1), "")) < NbDigits - 1 Then                        NbDiff = 1                        Exit For                    End If                Next i                If NbDiff = 0 Then boolGood = True            End If        End If    Loop    AskToUser = strInEnd Function

## Vedit macro language

Buf_Switch(Buf_Free)#90 = Time_Tick                     // seed for random number generator#91 = 10                            // random numbers in range 0 to 9while (EOB_pos < 4) {               // 4 digits needed    Call("RANDOM")    BOF Ins_Char(Return_Value + '0')    Replace("(.)(.*)\1", "\1\2", REGEXP+BEGIN+NOERR)  // remove any duplicate} #3 = 0repeat (99) {    Get_Input(10, "Guess a 4-digit number with no duplicate digits: ", NOCR)    if (Reg_Size(10) == 0) { Break }                // empty string = exit    Num_Eval_Reg(10)                                // check for numeric digits    if (Chars_Matched != 4) {        M("You should enter 4 numeric digits\n")        Continue    }     Goto_Pos(4)                                     // count bulls    Reg_Ins(10, OVERWRITE)    #1 = Search("(.)...\1", REGEXP+BEGIN+ALL+NOERR)     RS(10, "[", INSERT)                             // count cows    RS(10, "]", APPEND)    #2 = Search_Block(@10, 0, 4, REGEXP+BEGIN+ALL+NOERR) - #1     #3++    NT(#1, NOCR) M(" bulls,") NT(#2, NOCR) M(" cows\n")     if (#1 == 4) {        M("You won after") NT(#3, NOCR) M(" guesses!\n")        Break    }}Buf_Quit(OK)Return //--------------------------------------------------------------// Generate random numbers in range 0 <= Return_Value < #91//  #90 = Seed    (0 to 0x7fffffff)//  #91 = Scaling (0 to 0x10000) :RANDOM:#92 = 0x7fffffff / 48271#93 = 0x7fffffff % 48271#90 = (48271 * (#90 % #92) - #93 * (#90 / #92)) & 0x7fffffffReturn ((#90 & 0xffff) * #91 / 0x10000)

## Visual Basic .NET

Imports SystemImports System.Text.RegularExpressions Module Bulls_and_Cows    Function CreateNumber() As String        Dim random As New Random()        Dim sequence As Char() = {"1"c, "2"c, "3"c, "4"c, "5"c, "6"c, "7"c, "8"c, "9"c}         For i As Integer = 0 To sequence.Length - 1            Dim j As Integer = random.Next(sequence.Length)            Dim temp As Char = sequence(i) : sequence(i) = sequence(j) : sequence(j) = temp        Next         Return New String(sequence, 0, 4)    End Function     Function IsFourDigitNumber(ByVal number As String) As Boolean        Return Regex.IsMatch(number, "^[1-9]{4}\$")    End Function     Sub Main()        Dim chosenNumber As String = CreateNumber()        Dim attempt As Integer = 0        Console.WriteLine("Number is chosen")        Dim gameOver As Boolean = False        Do            attempt += 1            Console.WriteLine("Attempt #{0}. Enter four digit number: ", attempt)            Dim number As String = Console.ReadLine()            Do While Not IsFourDigitNumber(number)                Console.WriteLine("Invalid number: type four characters. Every character must digit be between '1' and '9'.")                number = Console.ReadLine()            Loop             Dim bulls As Integer = 0            Dim cows As Integer = 0             For i As Integer = 0 To number.Length - 1                Dim j As Integer = chosenNumber.IndexOf(number(i))                If i = j Then                    bulls += 1                ElseIf j >= 0 Then                    cows += 1                End If            Next             If bulls < chosenNumber.Length Then                Console.WriteLine("The number '{0}' has {1} bulls and {2} cows", _                    number, bulls, cows)            Else                gameOver = True            End If        Loop Until gameOver        Console.WriteLine("The number was guessed in {0} attempts. Congratulations!", attempt)    End SubEnd Module

## Wren

Translation of: Kotlin
Library: Wren-set
Library: Wren-ioutil
import "random" for Randomimport "/set" for Setimport "/ioutil" for Input var MAX_GUESSES = 20  // sayvar r = Random.new()var num// generate a 4 digit random number from 1234 to 9876 with no zeros or repeated digitswhile (true) {    num = (1234 + r.int(8643)).toString    if (!num.contains("0") && Set.new(num).count == 4) break} System.print("All guesses should have exactly 4 distinct digits excluding zero.")System.print("Keep guessing until you guess the chosen number (maximum %(MAX_GUESSES) valid guesses).\n")var guesses = 0while (true) {    var guess = Input.text("Enter your guess : ")    if (guess == num) {        System.print("You've won with %(guesses+1) valid guesses!")        return    }    var n = Num.fromString(guess)    if (!n) {        System.print("Not a valid number")    } else if (guess.contains("-") || guess.contains("+")) {        System.print("Can't contain a sign")    } else if (guess.contains("0")) {        System.print("Can't contain zero")    } else if (guess.count != 4) {        System.print("Must have exactly 4 digits")    } else if (Set.new(guess).count < 4) {        System.print("All digits must be distinct")    } else {        var bulls = 0        var cows  = 0        var i = 0        for (c in guess) {            if (num[i] == c) {                bulls = bulls + 1            } else if (num.contains(c)) {                cows = cows + 1            }            i = i + 1        }        System.print("Your score for this guess:  Bulls = %(bulls)  Cows = %(cows)")        guesses = guesses + 1        if (guesses == MAX_GUESSES) {            System.print("You've now had %(guesses) valid guesses, the maximum allowed")            return        }    }}
Output:

Sample game:

All guesses should have exactly 4 distinct digits excluding zero.
Keep guessing until you guess the chosen number (maximum 20 valid guesses).

Enter your guess : 1234
Your score for this guess:  Bulls = 1  Cows = 1
Enter your guess : 1567
Your score for this guess:  Bulls = 0  Cows = 1
Enter your guess : 8239
Your score for this guess:  Bulls = 2  Cows = 1
Enter your guess : 8294
Your score for this guess:  Bulls = 2  Cows = 0
Enter your guess : 8273
Your score for this guess:  Bulls = 3  Cows = 0
Enter your guess : 8275
Your score for this guess:  Bulls = 2  Cows = 1
Enter your guess : 8263
Your score for this guess:  Bulls = 3  Cows = 0
Enter your guess : 8213
Your score for this guess:  Bulls = 3  Cows = 0
Enter your guess : 8253
You've won with 9 valid guesses!


## zkl

Play one game:

d:=Dictionary(); do{ d[(1).random(10)]=True }while(d.len()<4);abcd:=d.keys.shuffle();while(1){   guess:=ask("4 digits: ")-" ,";   if(guess.len()!=4 or guess.unique().len()!=4) continue;   bulls:=abcd.zipWith('==,guess).sum(0);   cows:=guess.split("").enumerate()      .reduce('wrap(s,[(n,c)]){ s + (d.find(c,False) and abcd[n]!=c) },0);   if(bulls==4) { println("You got it!"); break; }   "%d bull%s and %d cow%s".fmt(bulls,s(bulls),cows,s(cows)).println();}fcn s(n){ (n!=1) and "s" or "" }
Output:
4 digits: 4,5,6,7
1 bull and 0 cows
4 digits: 1234
0 bulls and 2 cows
4 digits: 3528
You got it!