圆柱类

/* 
* Copyright (c) 2013, 烟台大学计算机学院                     
* All rights reserved.                     
* 文件名称：test.cpp                     
* 作者：邱学伟                    
* 完成日期：2013 年 5 月 19 日                     
* 版本号：v1.0                                        
* 输入描述：无                     
* 问题描述：                  
* 程序输出：
* 问题分析：                    
* 算法设计：略                     
*/         

/*（1）先建立一个Point(点)类，包含数据成员x,y(坐标点)；
    （2）以Point为基类，派生出一个Circle(圆)类，增加数据成员 (半径)；
    （3）再以Circle类为直接基类，派生出一个Cylinder(圆柱体)类，再增加数据成员h(高)。
     要求编写程序，设计出各类中基本的成员函数（包括构造函数、析构函数、修改数据成员和获取数据成员的公共接口、用于输出的重载运算符“<<”函数等），使之能用于处理以上类对象，最后求出圆格柱体的表面积、体积并输出。
*/
#include <iostream>
using namespace std;
class Point
{
    public:
    Point(double a=0,double b=0);
    void SetPoint(double,double);
    double getX() const {return x;}
    double getY() const {return y;}
    void ShowPoint();
    friend ostream & operator<<(ostream &output,const Point &c);
    protected:
    double x,y;
};
Point::Point(double a,double b)
{
    x=a;
    y=b;
}
void Point::SetPoint(double x1,double y1)
{
    x=x1;
    y=y1;
}
void Point::ShowPoint()
{
    cout<<"Point: ("<<x<<","<<y<<")"<<endl;
}
ostream & operator<<(ostream &output,const Point &c)
{
    output<<"point: ("<<c.x<<","<<c.y<<")"<<endl;
    return output;
}
class Circle:public Point
{
   public:
   Circle(double a,double b,double c):Point(a,b),r(c){}
   void SetCircle(double r2);
   double Getr(){return r;}
   double area();
   void ShowCircle();
   friend ostream & operator<<(ostream &,const Circle &C);
   protected:
   double r;
};
void Circle::SetCircle(double r2)
{
    r=r2;
}
double Circle::area()
{
    return 3.1415*r*r;
}
void Circle::ShowCircle()
{
    cout<<"Circle: ("<<x<<","<<y<<") r="<<r<<endl;
}
ostream & operator<<(ostream &output,const Circle &C)
{
    output<<"Circle: ("<<C.x<<","<<C.y<<") r="<<C.r<<endl;
    return output;
}
class Cylinder:public Circle
{
    public:
    Cylinder(double x3,double y3,double r3,double h3):Circle(x3,y3,r3),h(h3){}
    void setheight(double);
    double GetCylinder();
    double area();
    double volume();
    friend ostream &operator<<(ostream &,  Cylinder &);
    protected:
    double h;
};
void Cylinder::setheight(double h1)
{
    h=h1;
}
double Cylinder::GetCylinder()
{
    return h;
}
double Cylinder::area()
{
    return 2*3.1415*r*r+3.1415*2*r*h;
}
double Cylinder::volume()
{
    return 3.1415*r*r*h;
}

ostream &operator<<(ostream &output, Cylinder &cy)
{
    output<<"cylinder: ("<<cy.x<<","<<cy.y<<") r="<<cy.r<<" height="<<cy.h<<" area="<<cy.area()<<"　volume＝"<<cy.volume()<<endl;
    return output;
}
int main()
{
    Cylinder cy(3.5,6.4,5.2,10);
    cout<<"cylinder: POINT:("<<cy.getX()<<","<<cy.getY()<<") r="<<cy.Getr()<<" height="<<cy.GetCylinder()<<" are="<<cy.area()<<" volume="<<cy.volume()<<endl;
    cy.setheight(15);
    cy.SetCircle(7.5);
    cy.SetPoint(5,5);
    cout<<"cylinder: "<<cy<<endl;
    return 0;
}