..设计一个用来表示直角坐标系的location类，在主程序中创建类location的两个对象A和B，要求A的坐标点在第

急需

#include "iostream.h"
#include "math.h"
class Location {
private:
int x,y;
public:
Location(int i, int j):x(i),y(j) {}
int Getx( ) {return x;}
int Gety( ) {return y;}
double distance(Location b);
friend double distance(Location &a, Location &b);
};
double distance(Location &a, Location &b) //友元函数
{ int dx=a.x-b.x;
int dy=a.y-b.y;
return sqrt(dx*dx+dy*dy); }
double Location::distance(Location b) //成员函数
{ int dx=x-b.x;
int dy=y-b.y;
return sqrt(dx*dx+dy*dy); }
void main( )
{
Location A(-10,-20),B(-40,60);
cout<<"A("<<A.Getx( )<<","<<A.Gety( )<<"),B("<<B.Getx( )<<","<<B.Gety( )<<")"<<endl;
double d=A.distance(B); //调用成员函数
cout<<"Distance1= "<<d<<endl;
cout<<"Distance2= "<<distance(A,B)<<endl;} //调用友元函数