第五周项目一 体验常成员函数

#include <iostream>#include <cmath>using namespace std;class CPoint{private:   double x;  // 横坐标   double y;  // 纵坐标public:    CPoint(double xx=0,double yy=0);    double Distance1(CPoint p) const; //两点之间的距离(一点是当前点——想到this了吗?，另一点为p)   double Distance0() const;          // 到原点(0,0)的距离   CPoint SymmetricAxis(char style) const;//style取'x','y'和'o'分别表示按x轴, y轴, 原点对称    void input();  //以x,y 形式输入坐标点   void output(); //以(x,y) 形式输出坐标点};CPoint::CPoint(double xx,double yy){    x=xx;    y=yy;}void CPoint::input(){    char c;   cout<<"请输入坐标点（x,y）：";    while(cin>>x>>c>>y)   {      if(c!=',')       cout<<"您的输入有误请检查后再输入！";        else        break;   }}double CPoint::Distance1(CPoint p)const{    return sqrt((p.x-x)*(p.x-x)+(p.y-y)*(p.y-y));}// 求点到原点的距离double CPoint::Distance0() const{  return sqrt(x*x+y*y);}CPoint CPoint::SymmetricAxis(char style) const{   CPoint p(p.x,p.y);   switch(style)    {    case 'x':       p.x=x;      p.y=-y;    break;   case 'y':       p.x=-x;       break;   case 'o':       p.x=-x;       p.y=-y;    }    return p;}void CPoint::output(){    cout<<"("<<x<<", "<<y<<")"<<endl;}int main( ){    double distance;    CPoint p1,p2,p;    p1.input();    p2.input();    distance=p1.Distance1(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('x');    cout<<"p1关于x轴的对称点为：";    p.output();    p=p1.SymmetricAxis('y');    cout<<"p1关于y轴的对称点为：";    p.output();   p=p1.SymmetricAxis('o');     cout<<"p1关于原点的对称点为：";    p.output();    return 0;}