第11周項目5-類族的設計

/*。
*Copyright(c)2014,煙臺大學計算機學院
*All right reserved,
*文件名：test.cpp
*作者：畢玉堂
*完成日期：2015年5月24日
*版本號：v1.0
*
問題描述：
*輸入描述：
*程序輸出：
*/
#include <iostream>
using namespace std;
class Point
{
public:
    Point(double x=0,double y=0);                    //構造函數
    void setPoint(double,double);                  //設置座標值
    double getX( ) const {return x;}              //讀x座標
    double getY( ) const {return y;}              //讀y座標
    friend ostream & operator<<(ostream &,const Point &);//重載運算符“<<”
protected:                                       //受保護成員
    double x,y;
};


//Point的構造函數
Point::Point(double a,double b)
{
    x=a;
    y=b;
}
//設置x和y的座標值
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類的公用派生類
{
public:
    Circle(double x=0,double y=0,double r=0);  //構造函數
    void setRadius(double);                  //設置半徑值
    double getRadius( ) const;               //讀取半徑值
    double area ( ) const;                   //計算圓面積
    friend ostream &operator<<(ostream &,const Circle &);//重載運算符“<<”
protected:
    double radius;
};

//定義構造函數，對圓心座標和半徑初始化
Circle::Circle(double a,double b,double r):Point(a,b),radius(r){ }

//設置半徑值
void Circle::setRadius(double r)
{
    radius=r;
}

//讀取半徑值
double Circle::getRadius( ) const
{
    return radius;
}

//計算圓面積
double Circle::area( ) const
{
    return 3.14159*radius*radius;
}

//重載運算符“<<”，使之按規定的形式輸出圓的信息
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);//構造函數
    void setHeight(double);                      //設置圓柱高
    double getHeight( ) const;                    //讀取圓柱高
    double area( ) const;                         //計算圓柱表面積
    double volume( ) const;                       //計算圓柱體積
    friend ostream& operator<<(ostream&,const Cylinder&);//重載運算符“<<”
protected:
    double height;                               //圓柱高
};

//定義構造函數
Cylinder::Cylinder(double a,double b,double r,double h) :Circle(a,b,r),height(h){}

//設置圓柱高
void Cylinder::setHeight(double h)
{
    height=h;
}

//讀取圓柱高
double Cylinder::getHeight( ) const
{
    return height;
}

//計算圓柱表面積
double Cylinder::area( ) const
{
    return 2*Circle::area( )+2*3.14159*radius*height;
}

//計算圓柱體積
double Cylinder::volume() const
{
    return Circle::area()*height;
}

//重載運算符“<<”
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(3.5,6.4,5.2,10);
    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;
}

運行結果：