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;
long long fun(int);
// write your code here......
factorial=fun(n);
cout << factorial << endl;
return 0;
}
long long fun(int k )
{if (k==1)
return 1;
else
return (k*fun(k-1));
}
