题解 | #计算一个数的阶乘#

#include <iostream>
using namespace std;

int main() {
    
    int n;
    cin >> n;
    long long factorial = 1;
    
    // 计算一个数的阶乘
    for(int i=2; i <= n; i++)
        factorial = factorial * i;
    cout << factorial << endl;
    
    return 0;
}