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

My code is not good as other but it works for me:

#include 
using namespace std;

unsigned int fattoriale (int n){
    if (n == 1){
        return 1;
    }
    else {
        return n * fattoriale(n-1);
    }
}

int main() {
    int tmp, num;
    cin >> num;

    tmp = fattoriale(num);

    cout << "Stampo il fattoriale del numero inserito: " << tmp << endl;

}