Factorial using for loop

factorial.for.cpp

// factorial.for.cpp
// juanfc 2023-10-11
// plain for loop to compute a factorial
// https://gist.github.com/aa19aa5fd6093f1905fd

#include <iostream>
using namespace std;

int main()
{

    int n;
    cout << "n?: ";
    // cin >> n;
    n = 16;

    long long unsigned f = 1;

    for (int i = 2; i <= n; ++i)
        f *= i;

    cout << n << "!: " << f << endl;
    return 0;
}