第四章 实验三

设计一个用来计算距离的坐标系

#include<iostream>
#include<cmath>
using namespace std;
class Location{
public:
	Location(double ,double );
	double Getx()
   {return x;}

  double  Gety()
  {return y;}
	double distance(Location&);
	friend double diatance(Location&,Location&);
private:
	double x, y;
};

Location::Location(double a,double b)
{x=a;
 y=b;}



double  Location::distance(Location&b)
{
    double dx=x-b.x;
	double dy=y-b.y;

  return sqrt(dx*dx+dy*dy); } 

 double distance(Location&a, Location&b)   
{    double dx=a.x-b.x; 
     double dy=a.y-b.y; 
     return sqrt(dx*dx+dy*dy); } 

double main( )
{ 
Location A(-10,-20),B(-40,60);
cout<<"A("<<A.Getx( )<<","<<A.Gety( )<<"),B("<<B.Getx( )<<","<<B.Gety( )<<")"<<endl;
 
 cout<<"Distance1= "<<A.distance(B)<<endl;  
 cout<<"Distance2= "<<distance(A,B)<<endl;
 system("pause");
return 0;}