using namespace std;
const float PI = (float)3.14159;
class Shape{
public:
virtual float CalCircumference()=0;
virtual float CalArea()=0;
};
//圓形
class Roundness: public Shape{
public:
Roundness(float r):radius(r)
{}
virtual float CalCircumference()
{
return 2 * PI * radius;
}
virtual float CalArea()
{
return PI * radius * radius;
}
private:
float radius;
};
//正方形
class Square: public Shape{
public:
Square(float w):width(w)
{}
virtual float CalCircumference()
{
return 4 * width;
}
virtual float CalArea()
{
return width * width;
}
private:
float width;
};
//長方形
class Rectangle: public Shape{
public:
Rectangle(float w, float h):width(w), hight(h)
{}
virtual float CalCircumference()
{
return 2 * (width + hight);
}
virtual float CalArea()
{
return hight * width;
}
private:
float width;
float hight;
};
void main()
{
Shape* roud = new Roundness(3);
Shape* squ = new Square(3);
Shape* rang = new Rectangle(3, 4);
cout<<"圓形的周長:"<<roud->CalCircumference()<<" 面積："<<roud->CalArea()<<endl;
cout<<"正方形的周長:"<<squ->CalCircumference()<<" 面積："<<squ->CalArea()<<endl;
cout<<"長方形的周長:"<<rang->CalCircumference()<<" 面積："<<rang->CalArea()<<endl;
}