Write a C++ program that reads a non-negative integer N and calculates its factorial (N!).
A single non-negative integer N.
Print the factorial value.
0 <= N <= 20
5
120
Factorial of N is the product of all positive integers less than or equal to N.
#include <iostream>
int main() {
int n;
if (std::cin >> n) {
// Write your code here
}
return 0;
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