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// 输入一个整数，输出它的阶乘。
// 例如：输入5，输出120
#include <iostream>
using namespace std;
int main()
{
int n;
int sum = 1;
cout << "请输入一个整数：";
cin >> n;
while (n)
sum *= n;
--n;
}
cout << sum << endl;
return 0;