// Factorial of n = 1*2*3*...*n

#include <iostream>

using namespace std;

int factorial(int);

int main() {

int n, result;

cout << "Enter a non-negative number: ";

cin >> n;

result = factorial(n);

cout << "Factorial of " << n << " = " << result;

return 0;

}

int factorial(int n) {

if (n > 1) {

return n * factorial(n - 1);

} else {

return 1;

}

}