Write a C++ program defining a function `factorial` to compute N!.
A single non-negative integer N.
Print the factorial value.
0 <= N <= 20
5
120
Calculates factorial using an iterative function.
#include <iostream>
// Define factorial function here
int main() {
int n;
if (std::cin >> n) {
// Call factorial and print result
}
return 0;
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