Today we are going to solve HackerRank Day 13 : Abstract Classes 30 days of code solution in C++ , Java , Python & Javascript.
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:
- string title
- string author
- int price
- Implements the Book class’ abstract display() method so it prints these lines:
- Title: , a space, and then the current instance’s title.
- Author:, 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: $priceNote: 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:
The Alchemist
Paulo Coelho
248Sample Output
The following output is printed by your display() method:
Title: The Alchemist
Author: Paulo Coelho
Price: 248HackerRank Day 13 : Abstract Classes 30 days of code solution
Abstract Classes HackerRank Solution in C ++
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;
}
};Abstract Classes HackerRank Solution in Java
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
);
}
}Abstract Classes HackerRank Solution in Python 3
#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)Abstract Classes HackerRank Solution in JavaScript
// 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
}NEXT : Hackerrank Day 14 : scope 30 days of code solution
30 Days of Code HackerRank Solutions List – Day 0 to Day 29
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