哪位大神能告诉我这空格该填什么。。

C++实验题---填空（运算符重载）

#include <iostream>
using namespace std;
class Point
{
private:
  int x,y;
public:
  Point(int x=0, int y=0):x(x),y(y){}
  Point &operator ++();
  friend Point operator ++(Point &p,int);
  void print(){cout<<"X="<<x<<",Y="<<y<<endl;}

};
____________________
{
x++; y++;
____________________

}

____________________

{
    ____________________

pt.x++;
____________________

return pt;
}
int main()
{
int m;
while(cin>>m)
{
Point p1(m,m),p2(m+1,m+1),p3;
(++p1).print();
p3 = p2++;
p3.print();
p2.print();
}
return 0;
}