题解 | #函数实现计算一个数的阶乘#

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) {
    long long result=1;
    int i;
    for(i=1;i<=n;i+=1){
        result*=i;
    }
    return result;
    // write your code here......
    

}