How to write c++ code to print the factorial of n?

Answer 1

int res = 1;
int n;
std::cin >> n;

for (int i = n; i >= 1; i--)
{
res *= i;
}

std::cout << res;

Answer 2

This one will print you the first n factorials.

#include <iostream>
using namespace std;

int main()
{

int n, fact=1, i;
cout << "n:";
cin >> n;
for (i = 1; i <= n; i++)
{
fact = fact*i;
cout << i << "! = " << fact<<endl;
}

return 0;
}