while(cin>> X)用法

 1 #include<iostream>
 2 using namespace std;
 3 
 4 int main()
 5 {
 6     string s;
 7     while(1)
 8     {
 9         cin>>s;
10         cout<<s<<endl; 
11     } 
12 } 

 1 #include<iostream>
 2 using namespace std;
 3 
 4 int main()
 5 {
 6     string s;
 7     while(cin>>s)
 8     {
 9         
10         cout<<s<<endl; 
11     } 
12 }