#include<iostream>
#include<string>
using std::cin;
using std::cout;
using std::endl;
using std::string;
int main()
{
    string s1="Zhaojunn",s2="Zhaojun";
   cin>>s1>>endl;
   cin>>s2>>endl;
   if(s1==s2)
       cout<<"s1=s2!!"<<endl;
   else
       if(s1>s2)
           cout<<"s1>s2!!"<<endl;
       else
           cout<<"s1<s2!!!"<<endl;

   return 0;
}


错误是：d:\vc++\day1\ex3_7\ex3_7.cpp(10) : error C2679: binary '>>' : no operator defined which takes a right-hand operand of type '' (or there is no acceptable conversion)
求高手指点~~~不胜感激！！