[백준,c++] 10872번 - 팩토리얼

10872번: 팩토리얼

#include <iostream>

using namespace std;
int sum = 1;
int factorial(int N) {
    if (N == 0) {
        cout << sum;
        return 1;
    }
    else { 
        sum *= N;
        return factorial(N - 1);
    }
    }
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int N; cin >> N;
    factorial(N);
}