[YTU]_2922(Shape系列-8)

Description

小聪又想借用小强的Shape类了，但是不巧的是小强去考英语四级去了，但是小聪自力更生创建了Point类，但是他没有写Point类、继承Point类的Circle类、继承Circle类的Cylinder类这3个类的构造函数，请你帮忙补充这几个类未完成的函数。

小聪写的各种类

#include <iostream.h>
#define PI 3.14159
class Point
{
public:
  Point(float=0,float=0);
  void setPoint(float,float);
  float getX()const ;
  float getY()const ;
  friend ostream & operator<<(ostream &,const Point &);
protected:
  float x,y;
};
class Circle:public Point
{
public:
  Circle(float x=0,float y=0,float r=0);
  void setRadius(float);
  float getRadius() const;
  float area () const;
  friend ostream &operator<<(ostream &,const Circle &);
 protected:
  float radius;
};
class Cylinder:public Circle
{
public:
  Cylinder (float x=0,float y=0,float r=0,float h=0);
  void setHeight(float);
  float getHeight() const;
  float area() const;
  float volume() const;
  friend ostream& operator<<(ostream&,const Cylinder&);
 protected:
  float height;
};

//小聪用于测试的函数

int main()
{
 Cylinder cy1(3.5,6.4,5.2,10);
 cy1.setHeight(15);
 cy1.setRadius(7.5);
 cy1.setPoint(5,5);
 cout<<"new cylinder: "<<cy1;
 Point &pRef=cy1;
 cout<<"pRef as a point:"<<pRef;
 Circle &cRef=cy1;
 cout<<"cRef as a Circle:"<<cRef;
 return 0;
}

提示：不用提交全部程序，只提交补充部分。

 

Input

无

Output

输出小聪测试的各个数据

Sample Output

new cylinder:
Center=[5,5], r=7.5, h=15
area=1060.29, volume=2650.72
pRef as a point:[5,5]
cRef as a Circle:Center=[5,5], r=7.5, area=176.714
#include <iostream>
using namespace std;
#define PI 3.14159
class Point
{
public:
  Point(float=0,float=0);
  void setPoint(float,float);
  float getX()const ;
  float getY()const ;
  friend ostream & operator<<(ostream &,const Point &);
protected:
  float x,y;
};
class Circle:public Point
{
public:
  Circle(float x=0,float y=0,float r=0);
  void setRadius(float);
  float getRadius() const;
  float area () const;
  friend ostream &operator<<(ostream &,const Circle &);
 protected:
  float radius;
};
class Cylinder:public Circle
{
public:
  Cylinder (float x=0,float y=0,float r=0,float h=0);
  void setHeight(float);
  float getHeight() const;
  float area() const;
  float volume() const;
  friend ostream& operator<<(ostream&,const Cylinder&);
 protected:
  float height;
};Point::Point(float a,float b){x=a;y=b;}
float Point::getX()const
{return x;}
float Point::getY() const
{return y;}
void Point::setPoint(float xx,float yy)
{x=xx;y=yy;}
ostream &operator<<(ostream &cout,const Point &p)
{cout<<"["<<p.x<<','<<p.y<<']'<<endl;return cout;}
Circle::Circle(float x,float y,float r):Point(x,y),radius(r){}
void Circle::setRadius(float rr)
{radius=rr;}
float Circle::getRadius() const
{return radius;}
float Circle::area() const
{return PI*radius*radius;}
ostream& operator<<(ostream&cout,const Circle &c)
{cout<<"Center=["<<c.x<<','<<c.y<<"], r="<<c.radius<<", area="<<c.area()<<endl;return cout;}
Cylinder::Cylinder(float x,float y,float r,float h):Circle(x,y,r),height(h){}
void Cylinder::setHeight(float h)
{height=h;}
float Cylinder::getHeight()const
{return height;}
float Cylinder::area()const
{return PI*radius*radius;}
float Cylinder::volume()const
{return PI*radius*radius*getHeight();}
 ostream & operator<<(ostream &cout,const Cylinder& c)
    {cout<<"Center=["<<c.getX()<<","<<c.getY()<<"], "<<"r="<<c.getRadius()<<", "<<"h="<<c.getHeight()<<endl
    <<"area="<<2*PI*c.radius*c.getHeight()+2*PI*c.radius*c.radius<<", volume="<<PI*c.radius*c.radius*c.getHeight()<<endl;return cout;}
int main()
{
    Cylinder cy1(3.5,6.4,5.2,10);
    cy1.setHeight(15);
    cy1.setRadius(7.5);
    cy1.setPoint(5,5);
    cout<<"new cylinder:
"<<cy1;
    Point &pRef=cy1;
    cout<<"pRef as a point:"<<pRef;
    Circle &cRef=cy1;
    cout<<"cRef as a Circle:"<<cRef;
    return 0;
}