哪位大神能告诉这代码中的空格该填什么，拜托了~

Question

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;}输入输入有多组测试数据，每行为一组测试数据，且只有一个正整数。输出根据程序代码输出相应的信息。样例输入123样例输出X=2,Y=2X=3,Y=3X=2,Y=2X=3,Y=3X=4,Y=4X=3,Y=3X=4,Y=4X=5,Y=5X=4,Y=4