#include <iostream>
using namespace std;
class Shape
{
public:
Shape(){}
~Shape(){}
virtual float getArea() =0 ;
virtual float getPerim () =0 ;
int getVertexCount() const;
};
class Circle : public Shape
{
public:
Circle(float radius):itsRadius(radius){}
~Circle(){}
float getArea() { return 3.14 * itsRadius * itsRadius; }
float getPerim () { return 6.28 * itsRadius; }
private:
float itsRadius;
};
class Rectangle : public Shape
{
public:
Rectangle(float len, float width): itsLength(len), itsWidth(width){};
~Rectangle(){};
virtual float getArea() { return itsLength * itsWidth; }
float getPerim () { return 2 * itsLength + 2 * itsWidth; }
virtual float GetLength() { return itsLength; }
virtual float GetWidth() { return itsWidth; }
protected:
float itsWidth;
float itsLength;
};
class Square: public Rectangle
{
public:
Square (float len): Rectangle(len, len){};
~Square(){};
virtual float getArea() { return itsLength * itsWidth; }
float getPerim () { return 2 * itsLength + 2 * itsWidth; }
virtual float GetLength() { return itsLength; }
virtual float GetWidth() { return itsWidth; }
};
int Shape::getVertexCount() const
{
const type_info &info = typeid(*this);
if (info == typeid(Circle))
return 0;
else if (info == typeid(Square) || info == typeid(Rectangle))
return 4;
else
return -1;
}
int main()
{
Shape * sp;
sp = new Circle(5);
cout << "The area of the Circle is " << sp->getArea () << endl;
cout << "The perimeter of the Circle is " << sp->getPerim () << endl;
cout << "The vertex count of the Circle is " << sp->getVertexCount() << endl;
delete sp;
sp = new Rectangle(4,6);
cout << "The area of the Rectangle is " << sp->getArea() << endl;
cout << "The perimeter of the Rectangle is " << sp->getPerim () << endl;
cout << "The vertex count of the Rectangle is " << sp->getVertexCount() << endl;
delete sp;
sp = new Square(6);
cout << "The area of the Square is " << sp->getArea() << endl;
cout << "The perimeter of the Square is " << sp->getPerim () << endl;
cout << "The vertex count of the Square is " << sp->getVertexCount() << endl;
delete sp;
return 0;
}
