Magic 8-ball

Magic 8-ball is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

Create Magic 8-Ball. See details: Magic 8-Ball

AWK

<lang AWK>

1. syntax: GAWK -f MAGIC_8-BALL.AWK

BEGIN {

1. Ten answers are affirmative, five are non-committal, and five are negative.

   arr[++i] = "It is certain"
   arr[++i] = "It is decidedly so"
   arr[++i] = "Without a doubt"
   arr[++i] = "Yes, definitely"
   arr[++i] = "You may rely on it"
   arr[++i] = "As I see it, yes"
   arr[++i] = "Most likely"
   arr[++i] = "Outlook good"
   arr[++i] = "Signs point to yes"
   arr[++i] = "Yes"
   arr[++i] = "Reply hazy, try again"
   arr[++i] = "Ask again later"
   arr[++i] = "Better not tell you now"
   arr[++i] = "Cannot predict now"
   arr[++i] = "Concentrate and ask again"
   arr[++i] = "Don't bet on it"
   arr[++i] = "My reply is no"
   arr[++i] = "My sources say no"
   arr[++i] = "Outlook not so good"
   arr[++i] = "Very doubtful"
   srand()
   printf("Please enter your question or a blank line to quit.\n")
   while (1) {
     printf("\n? ")
     getline ans
     if (ans ~ /^ *$/) {
       break
     }
     printf("%s\n",arr[int(rand()*i)+1])
   }
   exit(0)

} </lang>

Output:

Please enter your question or a blank line to quit.

? will you still love me tomorrow
Yes, definitely

?

C

Translation of: Kotlin

<lang c>#include <stdio.h>

1. include <stdlib.h>
2. include <time.h>

int main() {

   char *question = NULL;
   size_t len = 0;
   ssize_t read;
   const char* answers[20] = {
       "It is certain", "It is decidedly so", "Without a doubt",
       "Yes, definitely", "You may rely on it", "As I see it, yes",
       "Most likely", "Outlook good", "Signs point to yes", "Yes",
       "Reply hazy, try again", "Ask again later",
       "Better not tell you now", "Cannot predict now",
       "Concentrate and ask again", "Don't bet on it",
       "My reply is no", "My sources say no", "Outlook not so good",
       "Very doubtful"
   };
   srand(time(NULL));
   printf("Please enter your question or a blank line to quit.\n");
   while (1) {
       printf("\n? : ");
       read = getline(&question, &len, stdin);
       if (read < 2) break;
       printf("\n%s\n", answers[rand() % 20]);
   }
   if (question) free(question);
   return 0;

}</lang>

Output:

Sample session :

Please enter your question or a blank line to quit.

? : Will May win the next UK election?

It is certain

? : Do flying saucers really exist?

Signs point to yes

? : Will humans ever colonize Mars?

It is decidedly so

? : 

Clojure

<lang clojure> (def responses

 ["It is certain" "It is decidedly so" "Without a doubt"
 "Yes, definitely" "You may rely on it" "As I see it, yes"
 "Most likely" "Outlook good" "Signs point to yes" "Yes"
 "Reply hazy, try again" "Ask again later"
 "Better not tell you now" "Cannot predict now"
 "Concentrate and ask again" "Don't bet on it"
 "My reply is no" "My sources say no" "Outlook not so good"
 "Very doubtful"])

(do

 (println "Ask a question.  ")
 (read-line)
 (println (rand-nth responses)))

</lang>

Factor

<lang factor>USING: io kernel random sequences ; IN: rosetta-code.magic-8-ball

CONSTANT: phrases {

   "It is certain" "It is decidedly so" "Without a doubt"
   "Yes, definitely" "You may rely on it" "As I see it, yes"
   "Most likely" "Outlook good" "Signs point to yes" "Yes"
   "Reply hazy, try again" "Ask again later"
   "Better not tell you now" "Cannot predict now"
   "Concentrate and ask again" "Don't bet on it"
   "My reply is no" "My sources say no" "Outlook not so good"
   "Very doubtful"

}

"Please enter your question or a blank line to quit." print

[ "? : " write flush readln empty? [ f ] [ phrases random print t ] if ] loop</lang>

Output:

Please enter your question or a blank line to quit.
? : Are there more than 10^57 grains of sand in the universe?
Yes
? : Are cats secretly alien spies?

Signs point to yes
? : Am I a genius?
Outlook not so good
? :

Forth

ANS/ISO FORTH, GNU FORTH

This example defines CASE: ;CASE that create a vector table. VECTORS compiles a number execution vectors into memory from the stack. Responses are created as executable routines that return their Execution token to the Forth Data Stack. The responses are retrieved from the data stack and compiled into a vector table, after which it is trivial for RANDOM to select any response. <LANG>\ magic eight ball Rosetta Code INCLUDE RANDOM.FS DECIMAL

CASE: ( -- -7) CREATE  ;

;CASE ( n -- ) DOES> SWAP CELLS + @ EXECUTE ;

VECTORS 0 DO , LOOP ;

NONAME ." It is certain" ;

NONAME ." It is decidedly so" ;

NONAME ." Without a doubt" ;

NONAME ." Yes, definitely" ;

NONAME ." You may rely on it" ;

NONAME ." As I see it, ye." ;

NONAME ." Most likely" ;

NONAME ." Outlook good" ;

NONAME ." Signs point to ye." ;

NONAME ." Yes." ;

NONAME ." Reply hazy, try again" ;

NONAME ." Ask again later" ;

NONAME ." Better not tell you now" ;

NONAME ." Cannot predict now" ;

NONAME ." Concentrate and ask again" ;

NONAME ." Don't bet on it" ;

NONAME ." My reply is no"  ;

NONAME ." My sources say no" ;

NONAME ." Outlook not so good" ;

NONAME ." Very doubtful" ;

CASE: MAGIC8BALL 20 VECTORS ;CASE

GO

      CR ." Please enter your question or a blank line to quit."
      BEGIN   CR ." ? :" PAD 80 ACCEPT 0>
      WHILE   CR 19 RANDOM MAGIC8BALL  CR
      REPEAT ;</LANG>

Go

Translation of: Kotlin

<lang go>package main

import ( "bufio" "bytes" "fmt" "log" "math/rand" "os" "time" )

func main() { rand.Seed(time.Now().UnixNano()) answers := [...]string{ "It is certain", "It is decidedly so", "Without a doubt", "Yes, definitely", "You may rely on it", "As I see it, yes", "Most likely", "Outlook good", "Signs point to yes", "Yes", "Reply hazy, try again", "Ask again later", "Better not tell you now", "Cannot predict now", "Concentrate and ask again", "Don't bet on it", "My reply is no", "My sources say no", "Outlook not so good", "Very doubtful", } const prompt = "\n? : " fmt.Print("Please enter your question or a blank line to quit.\n" + prompt) sc := bufio.NewScanner(os.Stdin) for sc.Scan() { question := sc.Bytes() question = bytes.TrimSpace(question) if len(question) == 0 { break } answer := answers[rand.Intn(len(answers))] fmt.Printf("\n%s\n"+prompt, answer) } if err := sc.Err(); err != nil { log.Fatal(err) } }</lang>

Output:

Please enter your question or a blank line to quit.

? : Will Trump win the next US election?

As I see it, yes

? : Is it true that we live in a multiverse?

Yes

? : Will the singularity occur before 2030?

My reply is no

? : 

JavaScript

<lang JavaScript> //console var answers = [ "It is certain", "It is decidedly so", "Without a doubt",

       "Yes, definitely", "You may rely on it", "As I see it, yes",
       "Most likely", "Outlook good", "Signs point to yes", "Yes",
       "Reply hazy, try again", "Ask again later",
       "Better not tell you now", "Cannot predict now",
       "Concentrate and ask again", "Don't bet on it",
       "My reply is no", "My sources say no", "Outlook not so good",
       "Very doubtful"])

console.log("ASK ANY QUESTION TO THE MAGIC 8-BALL AND YOU SHALL RECEIVE AN ANSWER!")

for(;;){

 var answer = prompt("question:")
 console.log(answer)

console.log(answers[Math.floor(Math.random()*answers.length)]); } </lang>

Output:

"ASK ANY QUESTION TO THE MAGIC 8-BALL AND YOU SHALL RECEIVE AN ANSWER!"

"Is this code going to work?"

"Most likely"

Kotlin

<lang scala>// Version 1.2.40

import java.util.Random

fun main(args: Array<String>) {

   val answers = listOf(
       "It is certain", "It is decidedly so", "Without a doubt",
       "Yes, definitely", "You may rely on it", "As I see it, yes",
       "Most likely", "Outlook good", "Signs point to yes", "Yes",
       "Reply hazy, try again", "Ask again later",
       "Better not tell you now", "Cannot predict now",
       "Concentrate and ask again", "Don't bet on it",
       "My reply is no", "My sources say no", "Outlook not so good",
       "Very doubtful"
   )
   val rand = Random()
   println("Please enter your question or a blank line to quit.")
   while (true) {
       print("\n? : ")
       val question = readLine()!!
       if (question.trim() == "") return
       val answer = answers[rand.nextInt(20)]
       println("\n$answer")
   }

}</lang>

Output:

Sample session :

Please enter your question or a blank line to quit.

? : Will Trump win the next US election?

Outlook not so good

? : Is it true that we live in a multiverse?

It is certain

? : Will the singularity occur before 2030?

Reply hazy, try again

? : Will the singularity occur before 2030?

Signs point to yes

? : 

M2000 Interpreter

<lang M2000 Interpreter> Module Magic.8.Ball {

     answers=("It is certain", "It is decidedly so", "Without a doubt", "Yes, definitely", "You may rely on it", "As I see it, yes", "Most likely", "Outlook good", "Signs point to yes", "Yes", "Reply hazy, try again", "Ask again later",  "Better not tell you now", "Cannot predict now", "Concentrate and ask again", "Don't bet on it", "My reply is no", "My sources say no", "Outlook not so good", "Very doubtful")
     Print "Please enter your question or a blank line to quit."
     {
           Line Input A$
           Print
           A$=trim$(A$)
           If A$="" Then Exit
           Print Array$(answers, Random(0, 19))
           Loop
     }

} Magic.8.Ball </lang>

ooRexx

<lang ooRexx> /* REXX */ a=.array~of("It is certain", "It is decidedly so", "Without a doubt",,

           "Yes, definitely", "You may rely on it", "As I see it, yes",,
           "Most likely", "Outlook good", "Signs point to yes", "Yes",,
           "Reply hazy, try again", "Ask again later",,
           "Better not tell you now", "Cannot predict now",,
           "Concentrate and ask again", "Don't bet on it",,
           "My reply is no", "My sources say no", "Outlook not so good",,
           "Very doubtful")

Do Forever

 Say 'your question:'
 Parse Pull q
 If q= Then Leave
 Say a[random(1,20)]
 Say 
 End</lang>

Output:

your question:
will it rain tonight
Concentrate and ask again

your question:
will it rain tonight
You may rely on it

your question:

Perl

<lang perl>@a = ('It is certain', 'It is decidedly so', 'Without a doubt', 'Yes, definitely',

'You may rely on it', 'As I see it, yes', 'Most likely', 'Outlook good',
'Signs point to yes', 'Yes', 'Reply hazy, try again', 'Ask again later',
'Better not tell you now', 'Cannot predict now', 'Concentrate and ask again',
"Don't bet on it", 'My reply is no', 'My sources say no', 'Outlook not so good',
'Very doubtful');

while () {

   print 'Enter your question:';
   last unless <> =~ /\w/;
   print @a[int rand @a], "\n";

}</lang>

Perl 6

Works with: Rakudo version 2018.03

<lang perl6>put 'Please enter your question or a blank line to quit.';

["It is certain", "It is decidedly so", "Without a doubt", "Yes, definitely",

"You may rely on it", "As I see it, yes", "Most likely", "Outlook good",
"Signs point to yes", "Yes", "Reply hazy, try again", "Ask again later",
"Better not tell you now", "Cannot predict now", "Concentrate and ask again",
"Don't bet on it", "My reply is no", "My sources say no", "Outlook not so good",
"Very doubtful"].roll.put while prompt('? : ').chars;</lang>

Output very similar to C, Kotlin and zkl examples.

PHP

CLI

<lang php><?php

$fortunes = array( "It is certain", "It is decidedly so", "Without a doubt", "Yes, definitely", "You may rely on it", "As I see it, yes", "Most likely", "Outlook good", "Signs point to yes", "Yes", "Reply hazy, try again", "Ask again later", "Better not tell you now", "Cannot predict now", "Concentrate and ask again", "Don't bet on it", "My reply is no", "My sources say no", "Outlook not so good", "Very doubtful" );

/*

* Prompt the user at the CLI for the command
*/

function cli_prompt( $prompt='> ', $default=false ) {

// keep asking until a non-empty response is given do { // display the prompt echo $prompt;

// read input and remove CRLF $cmd = chop( fgets( STDIN ) );

} while ( empty( $default ) and empty( $cmd ) );

return $cmd ?: $default;

}

$question = cli_prompt( 'What is your question? ' );

echo 'Q: ', $question, PHP_EOL;

echo 'A: ', $fortunes[ array_rand( $fortunes ) ], PHP_EOL; </lang>

Output:

$ php 8ball.php
What is your question? Are we together forever and never to part?
Q: Are we together forever and never to part?
A: Without a doubt

$ php 8ball.php
What is your question? Are we together forever we two?
Q: Are we together forever we two?
A: Don't bet on it

$ php 8ball.php
What is your question? Will I move heaven and earth to be together forever with you?
Q: Will I move heaven and earth to be together forever with you?
A: It is certain

Python

<lang python>import random

s = ('It is certain', 'It is decidedly so', 'Without a doubt', 'Yes, definitely',

'You may rely on it', 'As I see it, yes', 'Most likely', 'Outlook good',
'Signs point to yes', 'Yes', 'Reply hazy, try again', 'Ask again later',
'Better not tell you now', 'Cannot predict now', 'Concentrate and ask again',
"Don't bet on it", 'My reply is no', 'My sources say no', 'Outlook not so good',
'Very doubtful')

q_and_a = {}

while True:

   question = input('Ask your question:')
   if len(question) == 0: break
   
   answer = random.choice(s)
   
   if question in q_and_a:
       print('Your question has already been answered')
   else:
       q_and_a[question] = answer
       print(answer)</lang>

Output:

Ask your question:Is python the best language ever?
Better not tell you now
Ask your question:You are really not helping your case here.
Very doubtful
Ask your question:So, no?
Signs point to yes
Ask your question:So, no?
Your question has already been answered
Ask your question:

Racket

<lang>(define eight-ball-responses

   (list "It is certain" "It is decidedly so" "Without a doubt" "Yes definitely" "You may rely on it"
         "As I see it, yes" "Most likely" "Outlook good" "Yes" "Signs point to yes"
         "Reply hazy try again" "Ask again later" "Better not tell you now" "Cannot predict now"
         "Concentrate and ask again"
         "Don't count on it" "My reply is no" "My sources say no" "Outlook not so good"
         "Very doubtful"))

(define ((answer-picker answers)) (sequence-ref answers (random (sequence-length answers))))

(define magic-eightball (answer-picker eight-ball-responses))

(module+ main

(let loop ()
  (display "What do you want to know\n?")
  (read-line)
  (displayln (magic-eightball))
  (loop)))</lang>

Output:

We'll see if it's right.

REXX

version 1

<lang rexx> /* REXX */ Call mk_a "It is certain", "It is decidedly so", "Without a doubt",,

         "Yes, definitely", "You may rely on it", "As I see it, yes",,
         "Most likely", "Outlook good", "Signs point to yes", "Yes",,
         "Reply hazy, try again", "Ask again later",,
         "Better not tell you now", "Cannot predict now",,
         "Concentrate and ask again", "Don't bet on it",,
         "My reply is no", "My sources say no", "Outlook not so good",,
         "Very doubtful"

Do Forever

 Say 'your question:'
 Parse Pull q
 If q= Then Leave
 z=random(1,a.0)
 Say a.z
 Say 
 End

Exit mk_a: a.0=arg() Do i=1 To a.0

 a.i=arg(i)
 End

Return </lang>

Output:

your question:
will it rain tonight
My reply is no

your question:
will it rain tonight
Signs point to yes

your question:

version 2

This REXX version is modeled after the   Ring   entry.

The method used is to translate all blanks to psuedo-blanks, then extract and show a random phrase   (after translating the pseudo-blanks back to blanks).

Also, this REXX version appends a period to the phrase as per the (linked) documentation. <lang rexx>/*REXX program simulates the "shaking" of a "Magic 8-ball" and displaying an answer.*/ $= "It is certain ÷It is decidedly so ÷Without a doubt ÷Yes, definitely",

  "÷You may rely on it ÷As I see it, yes ÷Most likely ÷Outlook good ÷Signs point to yes",
  "÷Yes   ÷Reply hazy, try again   ÷Ask again later  ÷Better not tell you now",
  "÷Cannot predict now  ÷Concentrate and ask again   ÷Don't bet on it  ÷My reply is no",
  "÷My sources say no   ÷Outlook not so good         ÷Very doubtful"

@=translate(translate($, '┼', " "),, '÷') /*trans: blanks─►psuedos, seps─►blanks.*/ say space(translate(word(@,random(1,20)),,"┼")). /*stick a fork in it, we're all done. */</lang>

output   when invoking the REXX program:

Reply hazy, try again.

Ring

<lang ring>

1. Project : Magic 8-Ball

answers = ["It is certain", "It is decidedly so", "Without a doubt",

                "Yes, definitely", "You may rely on it", "As I see it, yes",
                "Most likely", "Outlook good", "Signs point to yes", "Yes",
                "Reply hazy, try again", "Ask again later",
                "Better not tell you now", "Cannot predict now",
                "Concentrate and ask again", "Don't bet on it",
                "My reply is no", "My sources say no", "Outlook not so good",
                "Very doubtful"]  

index = random(len(answers)-1)+1 see answers[index] + nl </lang> Output:

It is certain

zkl

Translation of: Perl 6

<lang zkl>answers:=T(

  "It is certain", "It is decidedly so", "Without a doubt",
  "Yes, definitely", "You may rely on it", "As I see it, yes",
  "Most likely", "Outlook good", "Signs point to yes", "Yes",
  "Reply hazy, try again", "Ask again later",
  "Better not tell you now", "Cannot predict now",
  "Concentrate and ask again", "Don't bet on it",
  "My reply is no", "My sources say no", "Outlook not so good",
  "Very doubtful"

); println("Please enter your question or a blank line to quit."); while(ask("? : ")){ println(answers[(0).random(answers.len())]) }</lang>

Output:

lease enter your question or a blank line to quit.
? : will it rain today 
It is certain
? : where is Turkey
Yes
? : what is the price of milk
It is decidedly so
? : who is Elton John
Most likely
? :