pta__【CPP0025】以点类Point及平面图形类Plane为基础设计圆类Circle

#include <iostream>
using namespace std;
//点类Point
class Point{
private:
double x;
double y;
public:
Point(double xv=0,double yv=0);/*构造函数*/
Point(const Point &p); /*拷贝构造*/
~Point(); /*析构函数*/
virtual void show()const; /*显示*/
void setX(double xv); /*设置X坐标*/
void setY(double yv); /*设置Y坐标*/
double getX() const; /*获取X坐标*/
double getY() const; /*获取Y坐标*/
};
Point::Point(const double xv,const double yv){/*构造函数*/
x=xv;
y=yv;
cout<<"Point Constructor run"<<endl;
}
Point::Point(const Point &p){/*拷贝构造*/
x=p.x;
y=p.y;
cout<<"Point CopyConstructor run"<<endl;
}
Point::~Point(){/*析构函数*/
cout<<"Point Destructor run"<<endl;
}
void Point::show() const{/*显示*/
cout<<"Point(X="<<x<<",Y="<<y<<")";
}
void Point::setX(double xv){/*设置X坐标*/
x=xv;
}
void Point::setY(double yv){/*设置Y坐标*/
y=yv;
}
double Point::getX() const{/*获取X坐标*/
return x;
}
double Point::getY() const{/*获取Y坐标*/
return y;
}
class Plane{/*平面图形基类*/
public:
virtual double length()const=0;/*周长*/
virtual double area()const=0; /*面积*/
};

class Circle : public Point, public Plane
{
protected:
static double PI;
private:
double radius = 0.0,x = getX(),y = getY();
public:
Circle(double a = 0, double b = 0, double c = 0):Point (a,b)
{
radius = c;
cout << "Circle Constructor run" << endl;
}
Circle(const Circle& r):Point(r)
{
radius = r.radius;
cout << "Circle CopyConstructor run" << endl;
}
~Circle()
{
cout << "Circle Destructor run" << endl;
}
void setR(double r)
{
radius = r;
}
double getR() const
{
return radius;
}
void show() const
{
cout << "Circle(Point(X=" << getX() << ",Y=" << getY() << ")," << "Radius=" << radius << ")";
}
double area() const
{
return PI * radius * radius;
}
double length() const
{
return radius * 2 * PI;
}
};
double Circle::PI = 3.14159;

void show(Point *p){/*点基类的显示函数*/
p->show();
}
void length(Plane *p){/*平面图形的周长函数*/
cout<<"Length="<<p->length()<<endl;
}
void area(Plane &p){/*平面图形的面积函数*/
cout<<"Area="<<p.area()<<endl;
}
//主函数
int main(void){
double x,y,r;
Circle c1,c2(c1);
show(&c1);
cout<<endl;
area(c1);
length(&c1);
cin>>x>>y>>r;
c2.setX(x);
c2.setY(y);
c2.setR(r);
show(&c2);
cout<<endl;
area(c2);
length(&c2);
}