<————源程序————>

//类OpoverClass定义头文件OpoverClass.h
#ifndef  H_OpoverClass
#define H_OpoverClass

#include  <iostream>

using namespace std;

class OpoverClass
{
     friend ostream& operator<<(ostream&,const OpoverClass&);
     friend istream& operator>>(istream&,OpoverClass&);
public:
     OpoverClass operator+ (const OpoverClass&) const;
     OpoverClass operator* (const OpoverClass&) const;
     OpoverClass (int i=0,int j=0)
     {
      a=i;b=j;
     };
private:
     int a;
     int b;
};

#endif

//类OpoverClass的实现文件OpoverClassImp.cpp
#include  <iostream>                    //line1
#include  "OpoverClass.h"              //line2

using namespace std;                  //line4

ostream& operator<<(ostream& osObject,const OpoverClass& right)
{
osObject<< "(" << right.a << "," << right.b << ")";   //line8
return osObject;
}


istream& operator>>(istream& isObject,OpoverClass& right) //line13
{
isObject>>right.a>>right.b; //line15
return isObject;
}


OpoverClass OpoverClass::operator *(const OpoverClass& right) const
{
OpoverClass temp;

temp.a=a*right.a;
temp.b=b*right.b;

return temp;
}

OpoverClass OpoverClass::operator +(const OpoverClass& right) const
{
OpoverClass temp;

temp.a=a+right.a;
temp.b=b+right.b;

return temp;
}

//主程序mainProgram.cpp
#include  <iostream>
#include "OpoverClass.h"

using namespace std;

int main()
{
OpoverClass u(23,46);
OpoverClass v;

cout<<"u="<<u<<endl;
cout<<"Enter two integers:";
cin>>v;
cout<<endl;
cout<<"u+v="<<u+v<<endl;
cout<<"u*v="<<u*v<<endl;

return 0;
}

在VC++6.0上编译时产生如下错误：
Compiling...
OpoverClassImp.cpp
E:\VC_Examples\E12\OpoverClassImp.cpp(8) : error C2248: 'a' : cannot access private member declared in class 'OpoverClass'
        e:\vc_examples\e12\opoverclass.h(20) : see declaration of 'a'
E:\VC_Examples\E12\OpoverClassImp.cpp(8) : error C2248: 'b' : cannot access private member declared in class 'OpoverClass'
        e:\vc_examples\e12\opoverclass.h(21) : see declaration of 'b'
E:\VC_Examples\E12\OpoverClassImp.cpp(15) : error C2248: 'a' : cannot access private member declared in class 'OpoverClass'
        e:\vc_examples\e12\opoverclass.h(20) : see declaration of 'a'
E:\VC_Examples\E12\OpoverClassImp.cpp(15) : error C2248: 'b' : cannot access private member declared in class 'OpoverClass'
        e:\vc_examples\e12\opoverclass.h(21) : see declaration of 'b'
Error executing cl.exe.

E12.exe - 4 error(s), 0 warning(s)

望高手给以指点！不胜感激！

这个好像是叫做“名字污染”吧。 改成“#include <iostream.h>”，并且删掉“using namespace std;”。 或者保留“#include <iostream>”，删掉“using namespace std;”，并且加入“using

std::cout; using std::endl; using std::ostream; using std::ifstream; using

std::cin; ... 等等”

非常感谢这位大哥的帮助，我头疼了两天的问题在你的指点下终于解决了，我也学到了新的东西，真的很感谢！