do-while()循环适合于运用在交互程序中，

1. d0-while()循环妙用  
2.  do   
3.  {          int val1,val2;  
4.      cout<<"please enter  two values";  
5.      cin>>val1>>val2;  
6.      cout<<"The sum of "<<val1<<"and"<<val2 
7.          <<"="<<val1+val2<<"\n\n\n"  
8.          <<"More ? [yes][no]";  
9.      cin>>rsp;  
10.  
11.  }while(!rsp.empty()&&rsp[0]!='n');