第十一周 课后实践：项目四——类族的设计

/*
* Copyright (c) 2014, 烟台大学计算机学院
* All rights reserved.
* 文件名称：Project4.cpp
* 作    者：陈旭
* 完成日期：2015年5月 27日
* 版 本 号：v1.0
*
* 问题描述：求出圆格柱体的表面积，体积并输出并且完成要求的计算任务
* 输入描述：略
* 程序输出：略
*/

#include <iostream>
using namespace std;
class Point
{
public:
Point(double x=0,double y=0);					 //构造函数
void setPoint(double,double);                  //设置坐标值
double getX( ) const {return x;}              //读x坐标
double getY( ) const {return y;}              //读y坐标
friend ostream & operator<<(ostream &,const Point &);//重载运算符“<<”
protected:										 //受保护成员
double x,y;
};

//Point的构造函数
Point::Point(double a,double b)
{
x=a;
y=b;
}
//设置x和y的坐标值
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   //circle是Point类的公用派生类
{
public:
Circle(double x=0,double y=0,double r=0);  //构造函数
void setRadius(double);                  //设置半径值
double getRadius( ) const;               //读取半径值
double area ( ) const;                   //计算圆面积
friend ostream &operator<<(ostream &,const Circle &);//重载运算符“<<”
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<<"Center=["<<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);//构造函数
void setHeight(double);                      //设置圆柱高
double getHeight( ) const;                    //读取圆柱高
double area( ) const;                         //计算圆柱表面积
double volume( ) const;                       //计算圆柱体积
friend ostream& operator<<(ostream&,const Cylinder&);//重载运算符“<<”
protected:
double height;                               //圆柱高
};

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;
}

//计算圆柱表面积
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& cy)
{
output<<"Center=["<<cy.x<<","<<cy.y<<"], r="<<cy.radius<<", h="<<cy.height
<<"\narea="<<cy.area( )<<", volume="<<cy.volume( )<<endl;
return output;
}

int main( )
{
Cylinder cy1(3.2,6.2,5.8,10);
cout<<"\noriginal cylinder:\nx="<<cy1.getX( )<<", y="<<cy1.getY( )<<", r="
<<cy1.getRadius( )<<", h="<<cy1.getHeight( )<<"\narea="<<cy1.area()
<<",volume="<<cy1.volume()<<endl;
cy1.setHeight(15);
cy1.setRadius(7.5);
cy1.setPoint(5,5);
cout<<"\nnew cylinder:\n"<<cy1;
return 0;
}