# 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.

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.

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 :


## 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

## 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.
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

### 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$function added on 220 to trim leading whitespace upon conversion. • Other formatting (clear screen, etc.) unique to Commodore BASIC. 100 D$="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 CHR$(147);"A RANDOM NUMBER HAS BEEN CREATED."170 PRINT "THE NUMBER HAS FOUR DIGITS FROM 1 TO 9, WITHOUT DUPLICATION."200 FOR Q=0 TO 1 STEP 0210 INPUT "GUESS THE NUMBER: "; G%219 REM CONVERT TO STRING AND TRIM LEADING SPACE220 G$=RIGHT$(STR$(G%),4)230 M=LEN(G$)<>4 OR G%=0240 IF NOT M THEN GOSUB 600250 IF NOT M THEN GOSUB 700260 IF M THEN PRINT "THE GUESS IS MALFORMED.":NEXT Q270 B=0280 C=0300 FOR I=1 TO 4310 C$=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+ABS(BULL)360 C=C+ABS(COW)370 NEXT I380 PRINT "BULLS:";B:PRINT "COWS:";C390 Q=ABS(G$=N$)400 NEXT Q500 PRINT "GOOD JOB!":END600 FOR I=2 TO 4:M=MID$(G$,I,1)="0"610 IF NOT M THEN NEXT I620 RETURN700 FOR I=1 TO 3710 FOR J=I+1 TO 4720 M=MID$(G$,I,1)=MID$(G$,J,1)730 IF NOT M THEN NEXT J,I740 RETURN 

## Batch File

::::Bulls and Cows Task from Rosetta Code Wiki::Batch File Implementation::::Directly OPEN the Batch File to play...:: @echo offtitle Bulls and Cows Gamesetlocal enabledelayedexpansion::GENERATING THE CODE TO BE GUESSED BY PLAYER...:beginset list=123456789set cnt=1set code=set tries=0:genset /a mod=10-%cnt%set /a rnd=%random%%%%mod%set pick=!list:~%rnd%,1!set code=%code%%pick%set list=!list:%pick%=!if %cnt%==4 (	set c1=%code:~0,1%&set c2=%code:~1,1%&set c3=%code:~2,1%&set c4=%code:~3,1%	goto :start)set /a cnt+=1goto :gen::/GENERATING THE CODE TO BE GUESSED BY PLAYER...::GAME DISPLAY:startclsecho.echo Bulls and Cows Gameecho Batch File Implementationecho.echo NOTE: Please MAXIMIZE this command window.echo.echo Gameplay:echo.echo I have generated a 4-digit code from digit 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 that equalsecho the CORRESPONDING digit in my code.echo.echo ** A score of one COW is accumulated for each digit that appearsecho in your guess, but in the WRONG position.echo.echo Now, start guessing^^!echo.:gameecho.set /p guess=Your Guess:::/GAME DISPLAY::INPUT VALIDATIONif !guess! gtr 9876 (echo Please input a valid guess.&goto :game)if !guess! lss 1234 (echo Please input a valid guess.&goto :game)set i1=%guess:~0,1%&set i2=%guess:~1,1%&set i3=%guess:~2,1%&set i4=%guess:~3,1%set chk=1:cycleset /a tmp1=%chk%+1for /l %%a in (%tmp1%,1,4) do (	if !i%chk%!==!i%%a! (		echo Please input a valid guess.&goto :game	))if %chk%==3 (	goto :score)set /a chk+=1goto :cycle::/INPUT VALIDATION::SCORING:scoreset /a tries+=1if %guess%==%code% (goto :won)set cow=0set bull=0for /l %%a in (1,1,4) do (	if !i%%a!==!c%%a! (		set /a bull+=1	) else (		set "entrycow=%%a"		call :scorecow	))set guess=echo BULLS=%bull% COWS=%cow%goto :game :scorecowset nums=1 2 3 4set put=!nums:%entrycow%=!for %%b in (%put%) do (	if !c%%b!==!i%entrycow%! (		set /a cow+=1		goto :EOF	))goto :EOF::/SCORING::ALREADY WON!:wonecho.echo.echo After %tries% Tries, YOU CRACKED IT^^! My code is %code%.echo.set /p opt=Play again?(Y/N)if /i "!opt!"=="y" (call :begin)if /i "!opt!"=="n" (exit/b)goto :won::/ALREADY WON! 

## 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!

## 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)
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$[] = str_split input if len s$[] = 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 4.1 : 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
Bulls: 0; Cows: 2
Bulls: 0; Cows: 1
Bulls: 1; Cows: 0
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
bulls:1, cows:1
bulls:1, cows:1
bulls:1, cows:1
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")    }  }}

## 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 ;
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

## 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  }} 

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)

Bulls: 0, cows: 2
Bulls: 1, cows: 1
Bulls: 0, cows: 3
Bulls: 1, cows: 1
Bulls: 1, cows: 3
Bulls: 2, cows: 2
Bulls: 2, cows: 2
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!
0 bulls and 2 cows!
1 bulls and 1 cows!
Your guess? 

## 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.

...


## Nanoquery

Translation of: Python
import Nanoquery.Util; random = new(Random) // a function to verify the user's inputdef verify_digits(input)	global size	seen = "" 	if len(input) != size		return false	else		for char in input			if not char in "0123456789"				return false			else if char in seen				return false			end 			seen += char		end	end 	return trueend size = 4chosen = ""while len(chosen) < size	digit = random.getInt(8) + 1 	if not str(digit) in chosen		chosen += str(digit)	endend println "I have chosen a number from 4 unique digits from 1 to 9 arranged in a random order."println "You need to input a 4 digit, unique digit number as a guess at what I have chosen." guesses = 1won = falsewhile !won	print "\nNext guess [" + str(guesses) + "]: "	guess = input() 	if !verify_digits(guess)		println "Problem, try again. You need to enter 4 unique digits from 1 to 9"	else		if guess = chosen			won = true		else			bulls = 0			cows = 0			for i in range(0, size - 1)				if guess[i] = chosen[i]					bulls += 1				else if guess[i] in chosen					cows += 1				end			end 			println format("  %d Bulls\n  %d Cows", bulls, cows)			guesses += 1		end	endend println "\nCongratulations you guess correctly in " + guesses + " attempts"

{{out}

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
2 Cows

Next guess : 1324
0 Bulls
3 Cows

...

Next guess : 2534
2 Bulls
2 Cows

Next guess : 4532

Congratulations you guess correctly in 11 attempts

## Nim

Translation of: Python
import random, strutils, rdstdinrandomize() proc random(a: string): char = a[random(0..a.len)] const  digits = "123456789"  size = 4 var digitsSet: set[char] = {}for d in digits: digitsSet.incl d var chosen = newString(size)for i in 0..chosen.high: chosen[i] = random(digits) echo """I have chosen a number from $# unique digits from 1 to 9 arranged in a random order.You need to input a$# digit, unique digit number as a guess at what I have chosen""".format(size, size) var guesses = 0while true:  inc guesses  var guess = ""  while true:    guess = readLineFromStdin("\nNext guess [$#]: ".format(guesses)).strip() if guess.len == size and allCharsInSet(guess, digitsSet): break echo "Problem, try again. You need to enter$# unique digits from 1 to 9".format(size)  if guess == chosen:    echo "\nCongratulations you guessed correctly in ",guesses," attempts"    break  var bulls, cows = 0  for i in 0 .. <size:    if guess[i] == chosen[i]: inc bulls    if guess[i] in chosen: inc cows  echo "  $# Bulls\n$# Cows".format(bulls, cows)

Sample 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
1195

Next guess : 79
Problem, try again. You need to enter 4 unique digits from 1 to 9

Next guess : 7983
0 Bulls
1 Cows

Next guess : 1293
2 Bulls
2 Cows

Next guess : 1193
3 Bulls
3 Cows

Next guess : 1195

Congratulations you guessed correctly in 4 attempts

## OCaml

let rec input () =  let s = read_line () in  try    if String.length s <> 4 then raise Exit;    String.iter (function      | '1'..'9' -> ()      | _ -> raise Exit    ) s;    let t = [ s.; s.; s.; s. ] in    let _ = List.fold_left  (* reject entry with duplication *)              (fun ac b -> if List.mem b ac then raise Exit; (b::ac))              [] t in    List.map (fun c -> int_of_string (String.make 1 c)) t  with Exit ->    prerr_endline "That is an invalid entry. Please try again.";    input ();; let print_score g t =  let bull = ref 0 in  List.iter2 (fun x y ->    if x = y then incr bull  ) g t;  let cow = ref 0 in  List.iter (fun x ->    if List.mem x t then incr cow  ) g;  cow := !cow - !bull;  Printf.printf "%d bulls, %d cows\n%!" !bull !cow;; let () =  Random.self_init ();  let rec mkgoal acc = function 4 -> acc  | i ->      let n = succ(Random.int 9) in      if List.mem n acc      then mkgoal acc i      else mkgoal (n::acc) (succ i)  in  let g = mkgoal [] 0 in  let found = ref false in  while not !found do    let t = input () in    if t = g    then found := true    else print_score g t  done;  print_endline "Congratulations you guessed correctly";;;

## Oforth

: bullsAndCows| numbers guess digits bulls cows |    ListBuffer new ->numbers   while(numbers size 4 <>) [ 9 rand dup numbers include ifFalse: [ numbers add ] else: [ drop ] ]    while(true) [      "Enter a number of 4 different digits between 1 and 9 : " print      System.Console askln ->digits      digits asInteger isNull digits size 4 <> or ifTrue: [ "Number of four digits needed" println continue ]      digits map(#asDigit) ->guess       guess numbers zipWith(#==) occurrences(true) ->bulls      bulls 4 == ifTrue: [ "You won !" println return ]       guess filter(#[numbers include]) size bulls - ->cows      System.Out "Bulls = " << bulls << ", cows = " << cows << cr      ] ;

## ooRexx

The solution at Rexx Version 2 is a valid ooRexx program.

## Oz

declare  proc {Main}     Solution = {PickNUnique 4 {List.number 1 9 1}}      proc {Loop}        Guess = {EnterGuess}     in        {System.showInfo         {Bulls Guess Solution}#" bulls and "#         {Cows Guess Solution}#" cows"}        if Guess \= Solution then {Loop} end     end  in     {Loop}     {System.showInfo "You have won!"}  end   fun {Bulls Xs Sol}     {Length {Filter {List.zip Xs Sol Value.'=='} Id}}  end   fun {Cows Xs Sol}     {Length {Intersection Xs Sol}}  end   local     class TextFile from Open.file Open.text end     StdIn = {New TextFile init(name:stdin)}  in     fun {EnterGuess}        try           {System.printInfo "Enter your guess (e.g. \"1234\"): "}           S = {StdIn getS($)} in %% verify {Length S} = 4 {All S Char.isDigit} = true {FD.distinct S} %% assert there is no duplicate digit %% convert from digits to numbers {Map S fun {$ D} D-&0 end}        catch _ then           {EnterGuess}        end     end  end   fun {PickNUnique N Xs}     {FoldL {MakeList N}      fun {$Z _} {Pick {Diff Xs Z}}|Z end nil} end fun {Pick Xs} {Nth Xs {OS.rand} mod {Length Xs} + 1} end fun {Diff Xs Ys} {FoldL Ys List.subtract Xs} end fun {Intersection Xs Ys} {Filter Xs fun {$ X} {Member X Ys} end}  end   fun {Id X} X endin  {Main}

## PARI/GP

This simple implementation expects guesses in the form [a,b,c,d].

bc()={  my(u,v,bulls,cows);  while(#vecsort(v=vector(4,i,random(9)+1),,8)<4,);  while(bulls<4,    u=input();    if(type(u)!="t_VEC"|#u!=4,next);    bulls=sum(i=1,4,u[i]==v[i]);    cows=sum(i=1,4,sum(j=1,4,i!=j&v[i]==u[j]));    print("You have "bulls" bulls and "cows" cows")  )};

## Perl 6

Translation of: Python
Works with: Rakudo version 2015.12

### 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!


$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 ## Sidef var size = 4var num = @(1..9).shuffle.first(size) for (var guesses = 1; true; guesses++) { var bulls = 0 var cows = 0 var input = read("Input: ", String).chars \ .uniq \ .grep(/^[1-9]$/) \                               .map{.to_n}     if (input.len != size) {        warn "Invalid input!\n"        guesses--        next    }     if (input == num) {        printf("You did it in %d attempts!\n", guesses)        break    }     for i (^num) {        if (num[i] == input[i]) {            bulls++        }        elsif (num.contains(input[i])) {            cows++        }    }     "Bulls: %d; Cows: %d\n".printf(bulls, cows)}
Output:
Input: 2953
Bulls: 1; Cows: 1
Input: 9654
Bulls: 1; Cows: 1
Input: 8924
Bulls: 1; Cows: 3
Input: 2894
You did it in 4 attempts!


## Smalltalk

Works with: GNU Smalltalk
Object subclass: BullsCows [  |number|  BullsCows class >> new: secretNum [ |i|    i := self basicNew.    (self isValid: secretNum)       ifFalse: [ SystemExceptions.InvalidArgument                    signalOn: secretNum                    reason: 'You need 4 unique digits from 1 to 9' ].    i setNumber: secretNum.    ^ i  ]  BullsCows class >> new [ |b| b := Set new.     [ b size < 4 ]       whileTrue: [ b add: ((Random between: 1 and: 9) displayString first) ].     ^ self new: (b asString)  ]  BullsCows class >> isValid: num [    ^ (num asSet size = 4) & ((num asSet includes: $0) not) ] setNumber: num [ number := num ] check: guess [ |bc| bc := Bag new. 1 to: 4 do: [ :i | (number at: i) = (guess at: i) ifTrue: [ bc add: 'bulls' ] ifFalse: [ (number includes: (guess at: i)) ifTrue: [ bc add: 'cows' ] ] ]. ^ bc ]]. 'Guess the 4-digits number (digits from 1 to 9, no repetition)' displayNl. |guessMe d r tries|[ tries := 0. guessMe := BullsCows new. [ [ 'Write 4 digits: ' display. d := stdin nextLine. (BullsCows isValid: d) ] whileFalse: [ 'Insert 4 digits, no repetition, exclude the digit 0' displayNl ]. r := guessMe check: d. tries := tries + 1. (r occurrencesOf: 'bulls') = 4 ] whileFalse: [ ('%1 cows, %2 bulls' % { r occurrencesOf: 'cows'. r occurrencesOf: 'bulls' }) displayNl. ]. ('Good, you guessed it in %1 tries!' % { tries }) displayNl. 'Do you want to play again? [y/n]' display. ( (stdin nextLine) = 'y' )] whileTrue: [ Character nl displayNl ]. ## Smart BASIC  'by rbytes, January 2017OPTION BASE 1P(" B U L L S A N D C O W S")!lP("A secret 4-digit number has been created, with")P("no repeats and no zeros. You must guess the number.")P("After each guess, you will be shown how many of your")P("digits are correct and in the matching location (bulls),")P("and how many are correct but in a different location (cows).")p("See how many tries it takes you to get the right answer.")' generate a 4-digit number with no repeatsguesses = 01 WHILE LEN(sec$) <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  ## Swift import Foundation func generateRandomNumArray(numDigits: Int = 4) -> [Int] { guard numDigits > 0 else { return [] } let needed = min(9, numDigits) var nums = Set<Int>() repeat { nums.insert(.random(in: 1...9)) } while nums.count != needed return Array(nums)} func parseGuess(_ guess: String) -> [Int]? { guard guess.count == 4 else { return nil } let guessArray = guess.map(String.init).map(Int.init).compactMap({$0 })   guard Set(guessArray).count == 4 else {    return nil  }   return guessArray} while true {  let num = generateRandomNumArray()  var bulls = 0  var cows = 0   print("Please enter a 4 digit number with digits between 1-9, no repetitions: ")   guard let guessStr = readLine(strippingNewline: true), let guess = parseGuess(guessStr) else {    print("Invalid input")    continue  }   for (guess, actual) in zip(guess, num) {    if guess == actual {      bulls += 1    } else if num.contains(guess) {      cows += 1    }  }   print("Actual number: \(num.map(String.init).joined())")  print("Your score: \(bulls) bulls and \(cows) cows\n")  print("Would you like to play again? (y): ")   guard readLine(strippingNewline: true)!.lowercased() == "y" else {    exit(0)  }}
Output:
Please enter a 4 digit number with digits between 1-9, no repetitions:
8496
Actual number: 6475
Your score: 1 bulls and 1 cows

Would you like to play again? (y):
y
Please enter a 4 digit number with digits between 1-9, no repetitions:
5983
Actual number: 7846
Your score: 0 bulls and 1 cows


## Tcl

proc main {} {    fconfigure stdout -buffering none    set length 4     puts "I have chosen a number from $length unique digits from 1 to 9 arranged in a random order.You need to input a$length digit, unique digit number as a guess at what I have chosen    "     while true {        set word [generateWord $length] set count 1 while {[set guess [getGuess$length]] ne $word} { printScore$length $word$guess            incr count        }        puts "You guessed correctly in $count tries." if {[yn "Play again?"] eq "n"} break }} proc generateWord {length} { set chars 123456789 for {set i 1} {$i <= $length} {incr i} { set idx [expr {int(rand() * [string length$chars])}]        append word [string index $chars$idx]        set chars [string replace $chars$idx $idx] } return$word     # here's another way to generate word with no duplications    set word ""    while {[string length $word] <$length} {        set char [expr {int(1 + 9*rand())}]        if {[string first $char$word] == -1} {            append word $char } }} proc getGuess {length} { puts -nonewline "Enter your guess: " while true { gets stdin guess if {[string match [string repeat {[1-9]}$length] $guess]} { return$guess        }        if {[string tolower [string trim $guess]] eq "quit"} { puts Bye exit } puts "The word must be$length digits between 1 and 9 inclusive.  Try again."    }} proc printScore {length word guess} {    set bulls 0    set cows 0    for {set i 0} {$i <$length} {incr i} {        if {[string index $word$i] eq [string index $guess$i]} {            incr bulls            set word [string replace $word$i $i +] } } puts "$bulls bulls"    for {set i 0} {$i <$length} {incr i} {        if {[set j [string first [string index $guess$i] $word]] != -1} { incr cows set word [string replace$word $j$j -]        }    }    puts "  $cows cows"} proc yn {msg} { while true { puts -nonewline "$msg \[y/n] "        gets stdin ans        set char [string tolower [string index [string trim $ans] 0]] if {$char eq "y" || $char eq "n"} { return$char        }    }} main

## TUSCRIPT

  MODE tuscriptSET nr1=RANDOM_NUMBERS (1,9,1)LOOP  SET nr2=RANDOM_NUMBERS (1,9,1)  IF (nr2!=nr1) EXITENDLOOPLOOP  SET nr3=RANDOM_NUMBERS (1,9,1)  IF (nr3!=nr1,nr2) EXITENDLOOPLOOP  SET nr4=RANDOM_NUMBERS (1,9,1)  IF (nr4!=nr1,nr2,nr3) EXITENDLOOPSET nr=JOIN(nr1,"'",nr2,nr3,nr4), limit=10LOOP r=1,limitSET bulls=cows=0ASK "round {r} insert a number":guessnr=""SET length=LENGTH(guessnr), checknr=STRINGS (guessnr,":>/:") LOOP n=nr,y=checknr  IF (length!=4) THEN   PRINT "4-letter digit required"   EXIT  ELSEIF (n==y) THEN   SET bulls=bulls+1  ELSEIF (nr.ct.":{y}:") THEN   SET cows=cows+1  ENDIF ENDLOOPPRINT "bulls=",bulls," cows=",cows IF (bulls==4) THEN  PRINT "BINGO"  EXIT ELSEIF (r==limit) THEN  PRINT "BETTER NEXT TIME"  EXIT ENDIFENDLOOP

Output:

round 1 insert a number >1234
bulls=1 cows=1
round 2 insert a number >5678
bulls=1 cows=1
round 3 insert a number >1298
bulls=2 cows=0
round 4 insert a number >2379
bulls=0 cows=0
round 5 insert a number >1468
bulls=4 cows=0
BINGO


## uBasic/4tH

Local(2)                               ' Let's use no globals Proc _Initialize                       ' Get our secret number Do                                     ' Repeat until it's guessed  Do    Input "Enter your guess: ";[email protected]      ' Enter your guess    While FUNC(_Invalid([email protected]))           ' but make sure it's a valid guess  Loop   [email protected] = FUNC(_Bulls)                    ' Count the number of bulls  [email protected] = FUNC(_Cows)                     ' Count the number of cows                                       ' Now give some feedback  Print : Print "\tThere were ";[email protected];" bulls and ";[email protected];" cows." : Print  Until [email protected] = 4                         ' Until the secret is guessedLoop Print "You win!"                       ' Yes, you guessed it End  _Initialize                            ' Make a secret  Local (1)   Do    [email protected] = 1234 + RND(8643)              ' Get a valid number    While FUNC(_Invalid([email protected]))           ' and accept it unless invalid  Loop   For [email protected] = 0 to 3                      ' Now save it at the proper place    @([email protected]+4) = @([email protected])  NextReturn  _Invalid Param(1)                      ' Check whether a number is valid  Local(2)                                       ' Ok, these can't be right at all  If ([email protected] < 1234) + ([email protected] > 9876) Then Return (1)                                       ' Now break 'em up in different digits  For [email protected] = 3 To 0 Step -1    @([email protected]) = [email protected] % 10                    ' A digit of zero can't be right    If @([email protected]) = 0 Then Unloop : Return (1)    [email protected] = [email protected] / 10  Next   For [email protected] = 0 To 2                      ' Now compare all digits    For [email protected] = [email protected] + 1 To 3               ' The others were already compared      If @([email protected]) = @([email protected]) Then Unloop : Unloop : Return (1)    Next                               ' Wrong, we found similar digits  NextReturn (0)                             ' All digits are different  _Bulls                                 ' Count the number of valid guesses  Local (2)   [email protected] = 0                               ' Start with zero   For [email protected] = 0 to 3                      ' Increment with each valid guess    If @([email protected]) = @([email protected]+4) Then [email protected] = [email protected] + 1  NextReturn ([email protected])                            ' Return number of valid guesses  _Cows  Local (3)                            ' Count the number of proper digits   [email protected] = 0                               ' Start with zero   For [email protected] = 0 To 3                      ' All the players guesses    For [email protected] = 4 To 7                    ' All the computers secrets      If ([email protected]+4) = [email protected] Then Continue     ' Skip the bulls      If @([email protected]) = @([email protected]) Then [email protected] = [email protected] + 1    Next                               ' Increment with valid digits  NextReturn ([email protected])                            ' Return number of valid digits

## UNIX Shell

Works with: bash version 3

## 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!


## ZX Spectrum Basic

Translation of: QBasic
10 DIM n(10): LET c$=""20 FOR i=1 TO 430 LET d=INT (RND*9+1)40 IF n(d)=1 THEN GO TO 3050 LET n(d)=160 LET c$=c$+STR$ d70 NEXT i80 LET guesses=090 INPUT "Guess a 4-digit number (1 to 9) with no duplicate digits: ";guess100 IF guess=0 THEN STOP 110 IF guess>9999 OR guess<1000 THEN PRINT "Only 4 numeric digits, please": GO TO 90120 LET bulls=0: LET cows=0: LET guesses=guesses+1: LET g$=STR$ guess130 FOR i=1 TO 4140 IF g$(i)=c$(i) THEN LET bulls=bulls+1: GO TO 160150 IF n(VAL g$(i))=1 THEN LET cows=cows+1160 NEXT i170 PRINT bulls;" bulls, ";cows;" cows"180 IF c$=g\$ THEN PRINT "You won after ";guesses;" guesses!": GO TO 10190 GO TO 90