多态性14

#include<iostream>
#define PI 3.14
using namespace std;
class Shape{
public:
Shape(){
cout<<"shape构造"<<endl;
}
virtual double getArea()=0;
virtual double getPerim()=0;

~Shape(){
cout<<"shape析构"<<endl;
}
};
class Rectangle:public Shape
{
public:
Rectangle(double h,double w):height(h),weight(w){
cout<<"rectangle 构造"<<endl;
}
double getArea(){return height*weight;}
double getPerim(){return 2*(height+weight);}
~Rectangle(){
cout<<"rectangle 析构"<<endl;
}
private:
double height;
double weight;
};
class Circle:public Shape
{
public:
Circle(double r):radius(r){
cout<<"Circle 构造"<<endl;
}
double getArea(){
return PI*radius*radius;
}
double getPerim(){
return 2*PI*radius;
}
~Circle(){
cout<<"Circle 析构"<<endl;
}
private:
double radius;
};
int main()
{
Rectangle r(3.0,2.0);
cout<<"矩形面积为:"<<r.getArea();
cout<<" 矩形周长为:"<<r.getPerim()<<endl;
Circle c(4.0);
cout<<"园的面积为:"<<c.getArea()<<endl;
cout<<" 圆的周长为:"<<c.getPerim()<<endl;
return 0;
}