Howto compute the factorial of x

Question

how to get the value of an integer x, indicated by x!, it is the product of the numbers 1 to x.

Example: 5! 1x2x3x4x5 = 120.

Answer 1

int factorial(int x)
{
    int f;
    if (x == 0)
    {
        f = 1;
    }
    else if (x > 0)
    {
     f = x*factorial(x-1);
    }
    return f;
}

int main()
{
   int n = 0;
   cout << factorial(n);

   return 0;
}