学步园

问题描述：设计平面坐标点类，计算两点之间距离、到原点距离、关于坐标轴和原点的对称点等

#include<iostream>
#include<Cmath>
using namespace std;
enum SymmetricStyle{axisx,axisy,Point};
class CPoint
{
private:
	double x;//横坐标
	double y;//纵坐标
public:
	CPoint(double xx=0,double yy=0);
	double Distance(CPoint p) const;//两点之间的距离
	double Distance0() const;//点到原点的距离
	CPoint SymmetricAxis(SymmetricStyle Style) const;
	void input();//输入点
	void output();//输出点
};
CPoint::CPoint(double xx,double yy):x(xx),y(yy){}
//定义两点间的距离函数
double CPoint::Distance(CPoint p) const   
{
	return sqrt((x-p.x)*(x-p.x)+(y-p.y)*(y-p.y));
}
//定义点到原点的距离函数
double CPoint::Distance0() const
{
	return  sqrt(x*x+y*y);
}

CPoint CPoint:: SymmetricAxis(SymmetricStyle Style) const
{
	CPoint p(x,y);
	switch (Style)
	{
	case axisx: p.y=-y;
		break;
	case axisy: p.x=-x;
		break;
	case Point: p.y=-y;
		p.x=-x;
		break;
		
	}
	return p;
}
void CPoint::input()
{
	char ch;
	while(1)
	{
		cin>>x>>ch>>y;
		if(ch!=',')
			cout<<"格式出现错误！"<<endl;
		else
			break;
	}
}
void CPoint::output()
{
    cout<<"("<<x<<','<<y<<")"<<endl;
}
void main()
{
	double distance;
	CPoint p1,p2,p;  
	cout<<"第1个点p1:";  
	p1.input();  
	cout<<"第2个点p2:";  	   
	p2.input();  
	distance=p1.Distance(p2);  
	cout<<"两点的距离为："<<distance<<endl;  	  
	distance=p1.Distance0();  
	cout<<"p1到原点的距离为："<<distance<<endl;  	  
	p=p1.SymmetricAxis(axisx);  
	cout<<"p1关于x轴的对称点为：";  
	p.output();  
	p=p1.SymmetricAxis(axisy);  
	cout<<"p1关于y轴的对称点为：";  	 
	p.output();  
	p=p1.SymmetricAxis(Point);  
	cout<<"p1关于原点的对称点为："; 
         p.output();  
}

注意：输入点时要有空格隔开，否则会出现死循环