Fac function

A factorial is a function in mathematics that multiplies a number by every number that precedes it.

int main(){
    int x = 7;
    printf("The factorial of the number is %d", fact(x));
    return 0;
}

int fact(int y)
{
    if (y == 0)
    return 1;
    return y * fact(y - 1);
}