Latest news:
Sahih al-Bukhari (সহীহ বুখারী) is a free Hadith application for android. This application is advertisement free. Download now https://play.google.com/store/apps/details?id=com.akramhossin.bukharisharif
Hacker Rank: Day 13: Abstract Classes
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: $price
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:
The Alchemist
Paulo Coelho
248
Sample Output
The following output is printed by your display() method:
Title: The Alchemist
Author: Paulo Coelho
Price: 248
Solution – Day 13: Abstract Classes
PHP Solution:
//Write MyBook class
class MyBook extends Book{
public $price = 0;
public function __construct($title, $author, $price) {
$this->title = $title;
$this->author = $author;
$this->price = $price;
}
public function display(){
print "Title: ".$this->title;
print "Author: ".$this->author;
print "Price: ".$this->price;
}
}
Tags : hackerRank, Linux, PHP,
Views : 732
