#include <iostream>
 
// Base class for shapes
class Shape {
public:
    virtual double calculateArea() const = 0;
    virtual ~Shape() = default;
};
 
// Derived class for Circle
class Circle : public Shape {
private:
    double radius;
public:
    Circle(double r) : radius(r) {}
    double calculateArea() const override {
        return 3.14159 * radius * radius; // Area of a circle: πr²
    }
};
 
// Derived class for Rectangle
class Rectangle : public Shape {
private:
    double width, height;
public:
    Rectangle(double w, double h) : width(w), height(h) {}
    double calculateArea() const override {
        return width * height; // Area of a rectangle: w × h
    }
};
 

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