VC6.0与VS差异的代码

VC6.0

#include<iostream>
using namespace std;
class MyClass2
{
int n;
public:
MyClass2(int i){n=i;}
operator ++(){n++;}//vc6.0支持，vs2012不支持
operator++(int){n+=2;}
void display()
{
cout<<"n="<<n<<endl;
}
};
void main()
{
MyClass2 A(5),B(5);
A++;
++B;
A.display();
B.display();
system("pause");
}

VS2012

#include<iostream>
using namespace std;
class MyClass2
{
int n;
public:
MyClass2(int i){n=i;}
const int operator ++(){n++;return n;}
const int operator++(int){n+=2;return n;}
void display()
{
cout<<"n="<<n<<endl;
}
};
void main()
{
MyClass2 A(5),B(5);
A++;
++B;
A.display();
B.display();
system("pause");
}