#include<iostream>

using namespace std;

class A

{

     public:

              A(int xx,int yy){X=xx;Y=yy;}

              void Set(A &p);

              void Disp()

              {cout<<X<<","<<Y<<endl;}

     private:

              int X,Y;

};

void A::Set(A &p)

{

     if(this!=&p)

     {X=p.X;Y=p.Y;}

}

int main()

{

     A o1(2,5),o2(10,20);

     o1.Disp();

     o1.Set(o2);

     o1.Disp();

     return 0;

}

   结果是 

2,5

10,20