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Day 13: Abstract Classes | HackerRank Solution

Hello coders, today we are going to solve Day 13: Abstract Classes HackerRank Solution in C++Java and Python.

Objective

Today, we will extend what we learned yesterday about Inheritance to Abstract Classes. Because this is a very specific object oriented concept, submissions are limited to the few languages that use this construct.

Task

Given a Book class and a Solution class, write a MyBook class that does the following:

  • Inherits from Book
  • Has a parameterized constructor taking these 3 parameters:
    1. string title
    2. string author
    3. int price
  • Implements the Book class’ abstract display() method so it prints these  lines:
    1. Title: , a space, and then the current instance’s title.
    2. Author:, a space, and then the current instance’s author.
    3. Price:, a space, and then the current instance’s price.

Note: Because these classes are being written in the same file, you must not use an access modifier (e.g.:public ) when declaring MyBook or your code will not execute.

Input Format

You are not responsible for reading any input from stdin. The Solution class creates a Book object and calls the MyBook class constructor (passing it the necessary arguments). It then calls the display method on the Book object.

Output Format

The void display() method should print and label the respective titleauthor, and price of the MyBook object’s instance (with each value on its own line) like so:

Note: The $ is prepended to variable names to indicate they are placeholders for variables.

Sample Input

The following input from stdin is handled by the locked stub code in your editor:

Sample Output

The following output is printed by your display() method:

Solution – Day 13: Abstract Classes

C++

Java

Python

Disclaimer: The above Problem (Day 13: Abstract Classes) is generated by Hacker Rank but the Solution is Provided by LearnKro. This tutorial is only for Educational and Learning Purpose.

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