HackerRank Day 13 Abstract Classes 30 days of code solution

HackerRank Day 13 Abstract Classes solution – In this HackerRank Day 13 Abstract Classes 30 days of code problem set, we have two classes Book and Solution. we need to make a new class MyBook that inherited from Book and can print the details.

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. Check out the Tutorial tab for learning materials and an instructional video.

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:
string title
string author
int price
Implements the Book class’ abstract display() method so it prints these 3 lines:
Title:, a space, and then the current instance’s title.
Autho:, a space, and then the current instance’s author.
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 title, author, and price of the MyBook object’s instance (with each value on its own line) like so:

Title: $title
Author: $author
Price: $price
Note: The $ is prepended to variable names to indicate they are placeholders for variables.

Problem solution in Python 2 programming.

#Write MyBook class
class MyBook(Book):
    def __init__(self,title,author,price):
        Book.__init__(self,title,author)
        self.price=price
    def display(self):
        print "Title: " + self.title
        print "Author: " + self.author
        print "Price: " + str(self.price)

Problem solution in Python 3 programming.

#Write MyBook class

class MyBook(Book):

    def __init__(self,title,author,price):
        self.title = title
        self.author = author
        self.price = price

    def display(self):
        print("Title:", title)
        print("Author:", author)
        print("Price:",price)

Problem solution in java programming.

class MyBook extends Book{
    int price;
    
    MyBook(String title, String author, int price){
        super(title, author);
        this.price = price;
    }
    
    public void display(){
        System.out.println(
                "Title: " + this.title + "n"
            +   "Author: " + this.author + "n"
            +   "Price: " + this.price
        );
    }
}

Problem solution in c++ programming.

//Write MyBook class
class MyBook : public Book {
    private:
        int price;
    
    public:
        MyBook(string title, string author, int price) : Book(title, author), price(price) {
            
        }
    
        void display(){
            cout << "Title: " << title << endl;
            cout << "Author: " << author << endl;
            cout << "Price: " << price << endl;
        }
};

Problem solution in Javascript programming.

// Declare your class here.
class MyBook extends Book{

    /**   
    *   Class Constructor
    *   
    *   @param title The book's title.
    *   @param author The book's author.
    *   @param price The book's price.
    **/
    // Write your constructor here
    constructor(title, author, price) {
        super(title, author);
        this.price = price;
    }
    /**   
    *   Method Name: display
    *   
    *   Print the title, author, and price in the specified format.
    **/
    // Write your method here
    display() {
        console.log('Title: ' + this.title);
        console.log('Author: ' + this.author);
        console.log('Price: ' + this.price);
    }
    
// End class
}