a_3_5.cpp

C++应用教程原码,里面包含该书中有十三章内容的代码,详细具体

#include "stdafx.h"
#include <iostream>
using namespace std;
void main ()
{  int i,n,t =1,sum = 0;
   cout << "Please input N: ";
   cin >> n;  //输入n
   for (i=1;i<= n;i++)  //循环求s
     {   t = t *i;  
		  sum = sum + t;
     }
   cout << "sum = " << sum;
   cin.get(); cin.get(); //等待结束，以便调测程序，可以删除
}