Check out example codes for "Rectangle area hackerrank solution in c++". It will help you in understanding the concepts better.

Code Example 1

#include <iostream>

using namespace std;
/*
 * Create classes Rectangle and RectangleArea
 */
class Rectangle{
    protected:
        int width;
        int height;

    public:
        virtual void display() const{
            cout<< width <<' ' << height << endl;
        }
};
class RectangleArea : public Rectangle {
    public:
        void display() const override {
            cout << (width * height) << endl;
        }
        void read_input(){
            cin >> width >> height;
        }
};

int main()
{
    /*
     * Declare a RectangleArea object
     */
    RectangleArea r_area;
    
    /*
     * Read the width and height
     */
    r_area.read_input();
    
    /*
     * Print the width and height
     */
    r_area.Rectangle::display();
    
    /*
     * Print the area
     */
    r_area.display();
    
    return 0;
}

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