lab8_1.cpp

该程序包含了c++中函数的多态性

// lab8_1.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "iostream.h"
class Point
{
public:
	Point(int x=0,int y=0)
	{_x=x;_y=y;}
    operator ++(); 
    operator ++(int); 
	operator --(); 
	operator --(int); 
	void display();
private:
	int _x, _y;
};
void Point::display()
{
    cout<<"_x="<<_x<<","<<"_y="<<_y<<endl;

}
Point::operator ++()
{
   return ++_x;
   return ++_y;
}
Point::operator ++(int)
{
   return _x++;
   return _y++;
}
Point::operator --()
{
   return --_x;
   return --_y;
}
Point::operator --(int)
{
   return _x--;
   return _y--;
}
void main()
{
  Point p(2,2);
  ++p;
  p.display();
  p++;
  p.display();
  --p;
  p.display();
  p--;
  p.display();
}