2_7.cpp

c++书籍的源代码

#include<iostream.h>
 int main()
{
 int sum=0,i=1; 
 while(i<=100)//i<=100时，重复执行如下语句
 { 
  sum=sum+i;  //累加
  i++;        
 }
 cout<<"sum is "<<sum<<endl;
 return(0);
}