本文介绍了一个基于C++的简单几何形状类的设计与实现，包括矩形、圆、球体和柱体等基本几何体的周长、面积及体积的计算方法，并通过实例演示了这些类的功能。
仅供参考
/**********************************************************/
//Function : main,Geometric及其派生类
//parm :
//comment :
//return : void
//Author :
//date : 2011.11.13
/**********************************************************/
#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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