Thread: Factorial Using recursion not working

I wrote this factorial program, which i expected should have returned an answer, but i didn't. I know it has to be a small conceptual mistake, but i just couldn't get it. Please help!

Code:

#include <stdio.h>
#include <stdlib.h>

int fact(int num);
void main() {
    int number, factorial;
    printf("Enter Number :   ");
    scanf("%d", &number);
    factorial = fact(number);
    printf("Factorial : %d", factorial);
}
int fact(int num){
    int res ;
    if(num==0){
        return 1;
    }
    while(num!=0){
        res = num*fact(num-1);
    }
    return res;
}

The code compiles fine and even runs...but it just gets stuck at
"factorial = fact(number);" in the main..

Code:

    while(num!=0){
        res = num*fact(num-1);
    }

There, your infinite loop.

Code:

#include <stdio.h>

int factorial(int n){

    if(!n) return 1;

    return n * factorial( n - 1 );
}

int main(){


    printf("%d\n",factorial(6));

    return 0;
}

Thanks guys!