07_05.cpp

来自「一些C++的课件和实验源代码」· C++ 代码 · 共 51 行

// 07_05.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include <stdio.h>
#include <conio.h>

class point
{
public:	int x, y;
public:
	point(int vx, int vy){ 
		x = vx;  y = vy; 
	}
	void print(){ 
		printf("\n (%d, %d)", x, y);	
	}
	point operator + (point p){			// 成员函数重载'+'
		point tp(0, 0);
		tp.x = x + p.x;    tp.y = y + p.y;
		return tp;
	}
	friend point operator + (point p1, point p2);
};

point operator + (point p1, point p2){	// 友元函数重载'+'
	point tp(0, 0);
	tp.x = p1.x + p2.x;
	tp.y = p1.y + p2.y;
	return tp;
}

point operator -(point p1, point p2){	// 普通外部函数重载'-'
	point tp(0, 0);
	tp.x = p1.x - p2.x;
	tp.y = p1.y - p2.y;
	return tp;
}

int main(int argc, char* argv[])
{
	point p1(30, 30), p2(10, 10);
	p1.print();
	p2.print();
//	(p1 + p2).print();
	(p1 - p2).print();
	getch();
	return 0;
}