Guessing Game Program

Question

I've created a simple guessing game program. My problem is I'm not sure how to loop the program back to the beginning of the program once the user has guessed a wrong number. I want the program to continue asking the user for a number until he gets it right. Can someone help me?

#include <stdio.h>

int main (void) {
    int value = 58;
    int guess;

    printf("Please enter a value: ");
    scanf("%i", &guess);

    if (guess == value) {
        printf("Congratulations, you guessed the right value");
    }
    else if (guess > value) {
        printf("That value is too high. Please guess again: ");
        scanf("%i", &guess);
    }
    else if (guess < value) {
        printf("That value is too low. Please guess again: ");
        scanf("%i", &guess);
    }

    return 0;
}

I think you need a good book: http://stackoverflow.com/q/562303/10077 — Fred Larson, Jan 16 '12 at 20:58

score 5 · Answer 1 · answered Jan 16 '12 at 20:46

5

This looks like a great spot for a while loop and a break statement. You can use the while loop like this to loop infinitely:

while (true) {
    /* ... /*
}

Then, once some condition becomes true and you want to stop looping, you can use the break statement to exit the loop:

while (true) {
     /* ... */

     if (condition) break;

     /* ... */
}

This way, you can break out of the loop when the user guesses correctly.

Alternatively, you can use a do ... while loop whose condition checks whether the loop should exit:

bool isDone = false;
do {
    /* ... */

    if (condition) isDone = true;

    /* ... */
} while (!isDone);

Hope this helps!

answered Jan 16 '12 at 20:46

templatetypedef

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Downvoter- Could you please comment on what's wrong with this answer? I would love to improve it if possible. – templatetypedef Jan 16 '12 at 20:52
Also note that you have to `#include ` when using `false`/`true`. – Gandaro Jan 16 '12 at 20:57
That's as clean as it gets. – theGrayFox Aug 02 '13 at 23:41

score 1 · Answer 2 · answered Jan 16 '12 at 20:45

1

There are a number of looping constructs in the C syntax. They are:

for()
while()
do/while()

Either of these should be simple to look up in whatever reference material you're using, and either is possible to use to solve this problem.

answered Jan 16 '12 at 20:45

unwind

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Don't forget `goto` & `setjmp()`! – Richard J. Ross III Jan 16 '12 at 20:45
"`goto` & `setjmp()`" & recursion ... in C, `main` can be called recursively :) – pmg Jan 16 '12 at 20:50

score 1 · Answer 3 · answered Jan 16 '12 at 20:54

Try this:

printf("Please enter a value: ");
do {
    scanf("%i", &guess);

    if (guess == value) {
        printf("Congratulations, you guessed the right value");
    }
    else if (guess > value) {
        printf("That value is too high. Please guess again: ");
    }
    else if (guess < value) {
        printf("That value is too low. Please guess again: ");
} while (guess != value);

score 0 · Answer 4 · answered Apr 23 '12 at 12:13

Your expected program is

#include <stdio.h>

void main (void) {
    int value = 58;
    int guess;

    do
    {
        printf("please enter a value : ");
        scanf("%i", &guess);
        if(guess > value)
            printf("this value is too big, ");
        else if(guess < value)
            printf("this value is too small, ");
    }while(guess != value);

    printf("Congradulation You Guessed The Right Number. \n");
}

JonH · Answer 5 · 2012-01-17T13:45:40.093

use do { /*your code*/ } while(condition);

do {
/*your code*/
char wannaPlayAgain;
wannaPlayAgain = getchar();
} while(wannaPlayAgain=='y');

Of course you should fix it in case people enter Y rather then y, but the point is you need to wrap your program in a do while loop (it will execute at least once) or a while loop (get the initial value before you enter the condition) with an initial start condition.

Guessing Game Program

5 Answers5