#include <iostream>

// Base class
class Shape {
public:
    virtual void displayArea() const = 0; // Virtual function to display area
};

// Derived class for Circle
class Circle : public Shape {
private:
    double radius;

public:
    Circle(double r) : radius(r) {}

    void displayArea() const override {
        double area = 3.14159 * radius * radius; // Area of a circle formula
        std::cout << "Area of the circle with radius " << radius << " is: " << area << std::endl;
    }
};

// Derived class for Rectangle
class Rectangle : public Shape {
private:
    double length;
    double width;

public:
    Rectangle(double l, double w) : length(l), width(w) {}

    void displayArea() const override {
        double area = length * width; // Area of a rectangle formula
        std::cout << "Area of the rectangle with length " << length << " and width " << width << " is: " << area << std::endl;
    }
};

int main() {
    // Creating objects of Circle and Rectangle classes
    Circle circleObj(5.0);
    Rectangle rectangleObj(4.0, 6.0);

    // Using virtual functions through base class pointers
    Shape* shapePtr1 = &circleObj;
    Shape* shapePtr2 = &rectangleObj;

    shapePtr1->displayArea(); // Display area of the circle
    shapePtr2->displayArea(); // Display area of the rectangle

    return 0;
}