#include <iostream> 
#include <string> 
#include <fstream> 
#include <set> 
#include <vector> 
using namespace std; 
int main() 
{ 
vector <string> vec; 
set <string> se; 
string s1,s2,s3; 
while(1) 
{ 
cout < <"请输入未来要看的书名:"; 
[color=#FF0000]getline(cin,s1,'\n');//cin>>s1; [/color]
vec.push_back(s1); 
//cout < <endl; 
//string cho1; 
string cho1; 
cout < <"你是否还要输入未来要看的书名yes/no:"; 
cin>>cho1; 
cout < <endl; 
if(cho1=="yes" ¦ ¦cho1=="YES") 
continue; 
else 
break; 
} 
return 0; 
} 

#include <iostream> 
#include <string> 
#include <fstream> 
#include <set> 
#include <vector> 
using namespace std; 
int main() 
{ 
vector <string> vec; 
set <string> se; 
string s1,s2,s3; 
while(1) 
{ 
cout < <"请输入未来要看的书名:"; 
getline(cin,s1,'\n');//cin>>s1; // 这样试试呢。
vec.push_back(s1); 
//cout < <endl; 
//string cho1; 
string cho1; 
cout < <"你是否还要输入未来要看的书名yes/no:"; 
cin>>cho1; 
cout < <endl; 
if(cho1=="yes" ¦ ¦cho1=="YES") 
continue; 
else 
break; 
} 
return 0; 
}