1354520.txt

定义一个Shape抽象类

shape.cpp
#include "shape.h"
#include <iostream.h>
#define	 PI 3.1415926

Rectangle::Rectangle(int m, int n):shape(m,n)
{
}

float Rectangle::GetArea()
{
	return	x*y;
}

float Rectangle::GetPerim()
{
	return	2*(x+y);
}

Circle::Circle(int r):shape(r)
{

}

float Circle::GetArea()
{
	return (PI*x*x);
}

float Circle::GetPerim()
{
	return (2*PI*x);
}

Squre::Squre(int m):Rectangle(m, m)
{

}

void main()
{
	Rectangle	obj1(3,5);
	cout<<"矩形，长3，5，面积周长分别为:"<<endl;
	cout<<obj1.GetArea()<<endl;
	cout<<obj1.GetPerim()<<endl;
	
	Squre		obj2(4);
	cout<<"正方形，边长为4，面积周长分别为:"<<endl;
	cout<<obj2.GetArea()<<endl;
	cout<<obj2.GetPerim()<<endl;

	Circle		obj3(10);
	cout<<"圆，半径为5，面积周长分别为:"<<endl;
	cout<<obj3.GetArea()<<endl;
	cout<<obj3.GetPerim()<<endl;
}



shape.h
class shape{
protected:
	int		x, y;
public:
	shape(int m = 0, int n = 0)
	{ x = m;  y = n; }
	virtual float GetArea() = 0;
	virtual float GetPerim() = 0;
};

class Rectangle:public shape{
public:
	Rectangle(int m, int n);
	float GetArea();
	float GetPerim();
}; 

class Circle:public shape{
public:
	Circle(int r);
	float	GetArea();
	float	GetPerim();

};

class Squre:public Rectangle{
public:
	Squre(int m);
};