e-6-4-1.txt

最后声明

// E-6-4-1.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
using namespace std;
class Point1;
class Point2;
class Point1{
  int m,n;
public:
	Point1(int x,int y){
	m=x,n=y;}
	friend void distan(Point1 a,Point2 b);
};
class Point2{
  int m,n;
public:
	Point2(int x,int y){
	m=x,n=y;}
	friend void distan(Point1 a,Point2 b);
};

void distan(Point1 a,Point2 b)
{ 
  cout<<"水平距离为"<<a.m-b.m<<endl;
  cout<<"垂直距离"<<a.n-b.n<<endl;
  }

void main()
{Point1 k(3,7);
 Point2 j(4,5);
 distan(k,j);
 system("pause");
}