fctrl.v2

#include <stdio.h>

int main()
{
    int a = 0;
    int runner = 1;
    int b = a;
    if (a == 0) {
        printf("%d", 1);
    } else if ((a > 0) && (a < 13)) {
    while (runner < b){
        a = a * runner;
        runner = runner + 1;
    }
    printf("%d", a);
    }
    return 0;
}