C++ program for function overloading and function Overriding.

Objective: Write a C++ program to show the implementation of function overloading and function Overriding.

Code: 

#include <iostream>

using namespace std;

// Base class

class Shape {

public:

    // Function to calculate area (Overloaded)

    void area(int side) {

        cout << "Area of Square: " << side * side << endl;

    }

    void area(int length, int breadth) {

        cout << "Area of Rectangle: " << length * breadth << endl;

    }

    // Virtual function to demonstrate overriding

    virtual void display() {

        cout << "This is a shape." << endl;

    }

};

// Derived class

class Circle : public Shape {

public:

    // Overriding the base class display function

    void display() override {

        cout << "This is a circle." << endl;

    }

    // Overloading area function for circle

    void area(double radius) {

        cout << "Area of Circle: " << 3.14 * radius * radius << endl;

    }

};

int main() {

    // Demonstrating function overloading

    Shape shape;

    shape.area(4);             // Calls area(int side) - Square

    shape.area(5, 6);          // Calls area(int length, int breadth) - Rectangle

    // Demonstrating function overriding

    Circle circle;

    shape.display();           // Calls base class display

    circle.display();          // Calls derived class display (overridden function)

    // Overloading area function in derived class

    circle.area(3.5);          // Calls area(double radius) - Circle

    return 0;

}

Output: