实验三

#include<iostream>
#include<cmath>
using namespace std;
class location
{
public:
	location(double X,double Y)
	{
		x=X;
		y=Y;
	}
	double location::Getx()
	{
		return x;
	}
	double location::Gety()
	{
		return y;
	}
	double location::distance(location& d1)
{
	double L;
	L=sqrt((d1.x-x)*(d1.x-x)+(d1.y-y)*(d1.y-y));
	return L;
}
	friend double distance1(location& d1,location& d2);
private:
	double x,y;
};
double distance1(location& d1,location& d2)
{
	double L;
	L=sqrt((d1.x-d2.x)*(d1.x-d2.x)+(d1.y-d2.y)*(d1.y-d2.y));
	return L;
}
int main()
{
	location A(-1,-1),B(-1,1);
	cout<<"A("<<A.Getx()<<","<<A.Gety()<<"),";
	cout<<"B("<<B.Getx()<<","<<B.Gety()<<")"<<endl;
	cout<<"distance1="<<B.distance(A)<<endl;
	cout<<"distance2="<<distance1(A,B)<<endl;
	system("pause");
	return 0;
}