[置顶] 面向对象第五次实验参考代码

#include <iostream.h>#include <math.h>const double PI=3.14159;class Geometric{public:Geometric(){}virtual double Get_Girth()=0; //周长virtual double Get_Area()=0; //面积virtual double Get_Volume()=0; //体积virtual void print()=0;//输出};class Rectangle:public Geometric{protected:double length,width;public:Rectangle(double l,double w):Geometric(),length(l),width(w){}double Get_Girth(){return 2 * (width+length);}double Get_Area(){return width * length;}double Get_Volume(){return 0.0;}void print(){cout<<"The Rectangle’s Girth is:"<<Get_Girth()<<endl;cout<<"The Rectangle’s Area is:"<<Get_Area()<<endl;}};class Circle:public Geometric{protected:double radius;public:Circle(double r):Geometric(){radius = r;}double Get_Girth(){return 2 * PI * radius;}double Get_Area(){return PI * radius * radius;}double Get_Volume(){return 0.0;}void print(){cout<<"The Circle’s Girth is:"<<Get_Girth()<<endl;cout<<"The Circle’s Area is:"<<Get_Area()<<endl;}};class Ball:public Circle{public:Ball(double r):Circle(r){}double Get_Girth(){return 0;}double Get_Area(){return 4 * Circle::Get_Area();}virtual double Get_Volume(){return 4.0 / 3 * Get_Area() * radius;}void print(){cout<<"The Ball’s Area is:"<<Get_Area()<<endl;cout<<"The Ball’s volume is:"<<Get_Volume()<<endl;}};class Column:public Circle{protected:double height;public:Column(double r,double h):Circle(r),height(h){}double Get_Area(){return Circle::Get_Girth() * height + 2 * Circle::Get_Area();}double Get_Volume(){return Circle::Get_Area() * height;}void print(){cout<<"The Column’s Area is:"<<Get_Area()<<endl;cout<<"The Column’s volume is:"<<Get_Volume()<<endl;}};void fun(Geometric &p){p.print();}void main(){double r,h,w,l;cout<<"Please input the radius and height:"<<endl;cin>>r>>h;Circle obj_Cir(r);fun(obj_Cir);Ball obj_Bal(r);fun(obj_Bal);Column obj_Col(r,h);fun(obj_Col);cout<<"Please input the length and width:"<<endl;cin>>l>>w;Rectangle obj_Rec(l,w);fun(obj_Rec);}

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