visual studio 2010 - Why isn't the "!=" operator working for me in C++ VS2012 -

a simple example：

    #include <iostream> #include <cstring> int main(void) {     using namespace std;     string a="abc";     string b="abc";     if(a!=b)         cout<<"abc";  } 

this code can compiled mingw g++ ,but can not compiled vs2012 , vs2010. dont know why.

what should make code can compiled vs2012 or vs2010

i found problem headfile why can work in g++？

try change

#include <cstring>

which old, c-style string.h by

#include <string>

which describe string class resides in std namespace in c++.