第十一周上機任務項目4

01./*      02.* 程式的著作權和版本聲明部分      03.* Copyright (c)2013, 煙台大學電腦學院學生      04.* All rightsreserved.      05.* 檔案名稱： point.cpp                                 06.* 作    者：趙冠哲                                  07* 完成日期：2013年5月9日      08.* 版本號碼： v1.0            09.* 輸入描述：      10.* 問題描述：    11.*/#include<iostream.h>#include<Cmath>#define PI 3.1415926//定義符號常量class Point //定義座標點類{private:    double x;//橫座標    double y;//縱座標public:    Point(double x0,double y0) {x=x0; y=y0;}    ~Point ()    {cout<<"Destructor called"<<endl;}    double get_x(){return x;} //公用基類的私人資料成員在衍生類別中不能訪問，需要擷取私人資料成員的公用介面    double get_y(){return y;}    friend ostream &operator << (ostream &, Point &);//聲明運算子"<<"的重載};//利用座標點類定義圓類, 其基類的資料成員表示圓的中心class Circle: public Point{private:    double d;public:    Circle(double xx,double yy,double dd): Point(xx,yy)    {        d=dd;    }    ~Circle()    {    }    friend ostream &operator << (ostream &, Circle &);    double get_d(){return d;}};class Cylinder: public Circle{private:    double h;public:    Cylinder(double xx,double yy,double dd,double hh): Circle (xx,yy,dd)    {        h=hh;    }   ~Cylinder()    {    }    friend ostream &operator << (ostream &,Cylinder &);    double get_h(){return h;}    double superficial_area();//表面積    double volume();//圓柱體的體積};ostream &operator << (ostream & output, Point & c){    output<<"點的橫座標為："<<c.x<<endl;    output<<"點的縱座標為："<<c.y<<endl;    return output;}ostream &operator << (ostream & output, Circle & c){    output<<"圓的半徑為："<<c.get_d()<<endl;    output<<"圓的圓心為"<<"("<<c.get_x()<<","<<c.get_y()<<")"<<endl;    return output;}ostream &operator << (ostream & output,Cylinder & c){    output<<"圓柱的高為："<<c.get_h()<<endl;    output<<"圓柱底面圓的半徑為："<<c.get_d()<<endl;    output<<"圓柱底面圓的圓心為"<<"("<<c.get_x()<<","<<c.get_y()<<")"<<endl;    return output;}//圓柱體的表面積double  Cylinder::superficial_area(){    double s=2*PI*get_d()*get_d()+2*PI*get_d()*get_h();     return s;}//圓柱體的體積double  Cylinder::volume(){    double v=PI*get_d()*get_d()*get_h();    return v;}int main(){    Point p(1,1);    cout<<p;    Circle ci(1,2,3);    cout<<ci;    Cylinder cy(1,2,4,6);    cout<<cy;    cout<<"圓柱的體積為："<<cy.volume ()<<endl;    cout<<"圓柱的表面積為："<<cy.superficial_area ()<<endl;       return 0;}

運行結果：