题解 | #函数实现计算一个数的阶乘#

#include <iostream>
using namespace std;

long long factorial(int n);

int main() {

    int n;
    cin >> n;

    cout << factorial(n) << endl;

    return 0;
}

long long factorial(int n) {
    if(n == 1){
        return 1;
    }else{
        long long a = n * factorial(n-1);
        return a;
    }
    
    
    

}