第十一周项目4类族的设计

/*
 *Copyright(c)2014,烟台大学计算机学院
 *All rights reserved.
 *文件名称：test.cpp
 *作者：曾晓
 *完成日期：2015年 5月 20日
 *版本号：v1.0
  */
#include <iostream>
using namespace std;
class Point
{
public:
	Point(double x=0,double y=0);
	void setPoint(double,double);
	double getX( ) const {return x;}
	double getY( ) const {return y;}
	friend ostream & operator<<(ostream &,const Point &);
protected:
	double x,y;
};
Point::Point(double a,double b)
{
	x=a;
	y=b;
}
void Point::setPoint(double a,double b)
{
	x=a;
	y=b;
}

ostream & operator<<(ostream &output,const Point &p)
{
	output<<"["<<p.x<<","<<p.y<<"]"<<endl;
	return output;
}

class Circle:public Point
{
public:
	Circle(double x=0,double y=0,double r=0);
	void setRadius(double);
	double getRadius( ) const;
	double area ( ) const;
	friend ostream &operator<<(ostream &,const Circle &);
protected:
	double radius;
};

Circle::Circle(double a,double b,double r):Point(a,b),radius(r){ }

void Circle::setRadius(double r)
{
	radius=r;
}

double Circle::getRadius( ) const
{
	return radius;
}
double Circle::area( ) const
{
	return 3.14159*radius*radius;
}
ostream &operator<<(ostream &output,const Circle &c)
{
	output<<"("<<c.x<<", "<<c.y<<"), r="<<c.radius<<", area="<<c.area( )<<endl;
	return output;
}

class Cylinder:public Circle
{
public:
	Cylinder (double x=0,double y=0,double r=0,double h=0);
	void setHeight(double);
	double getHeight( ) const;
	double area( ) const;
	double volume( ) const;
	friend ostream& operator<<(ostream&,const Cylinder&);
protected:
	double height;
};


Cylinder::Cylinder(double a,double b,double r,double h) :Circle(a,b,r),height(h){}
void Cylinder::setHeight(double h)
{
	height=h;
}
double Cylinder::getHeight( ) const
{
	return height;
}
double Cylinder::area( ) const
{
	return 2*Circle::area( )+2*3.14159*radius*height;
}

double Cylinder::volume() const
{
	return Circle::area()*height;
}

ostream &operator<<(ostream &output,const Cylinder& u)
{
	output<<"("<<u.x<<","<<u.y<<"), r="<<u.radius<<", h="<<u.height
		<<"area="<<u.area( )<<", volume="<<u.volume( )<<endl;
	return output;
}

int main( )
{
	Cylinder cy(3.5,6.4,5.2,10);
	cout<<"x="<<cy.getX( )<<", y="<<cy.getY( )<<", r="
		<<cy.getRadius( )<<", h="<<cy.getHeight( )<<"area="<<cy.area()
		<<",volume="<<cy.volume()<<endl;

	return 0;
}

运行结果：

很多地方都做得不好    总是觉得忙被时间推着走