【C语言训练】计算一个整数N的阶乘

1 #include <iostream>
2 using namespace std;
3 int main()
4 {
5     int n, i, sum = 1;
6     cin>>n;
7     if (n == 0 || n == 1)
8         cout<<"1";
9     else
10     {
11         for (i = 1; i <= n; i++)
12             sum *= i;
13         cout<<sum;
14     }
15     return 0;
16 }