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Author: AdityaSeth777

13 - Abstract Classes/Solution.cpp

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+#include <iostream>
+
+using namespace std;
+
+class Book {
+protected:
+    string title;
+    string author;
+public:
+    Book(string t, string a) {
+        title = t;
+        author = a;
+    }
+
+    virtual void display()=0;
+};
+//Aditya Seth
+
+class MyBook : public Book {
+private:
+    int price;
+public:
+    MyBook(string title, string author, int price) : Book(title, author) {
+        this->price = price;
+    }
+
+    void display() {
+        cout << "Title: " << this->title << endl;
+        cout << "Author: " << this->author << endl;
+        cout << "Price: " << this->price << endl;
+    }
+};
+
+int main() {
+    string title, author;
+    int price;
+    getline(cin, title);
+    getline(cin, author);
+    cin >> price;
+    MyBook novel(title, author, price);
+    novel.display();
+    return 0;
+}

13 - Abstract Classes/Solution.kt

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+import java.util.Scanner
+
+abstract class Book(var title: String, var author: String) {
+
+    internal abstract fun display()
+}
+
+class MyBook(t: String, a: String, private val price: Int) : Book(t, a) {
+
+    override fun display() {
+        println("Title: $title\nAuthor: $author\nPrice: $price")
+    }
+}
+
+fun main(args: Array<String>) {
+    val sc = Scanner(System.`in`)
+    val title = sc.nextLine()
+    val author = sc.nextLine()
+    val price = sc.nextInt()
+
+    val newNovel = MyBook(title, author, price)
+    newNovel.display()
+}

13 - Abstract Classes/Solution.py

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+from abc import ABCMeta, abstractmethod
+
+
+class Book(object, metaclass=ABCMeta):
+    def __init__(self, title, author):
+        self.title = title
+        self.author = author
+
+    @abstractmethod
+    def display(self): pass
+
+#Aditya Seth
+class MyBook(Book):
+    def __init__(self, title, author, price):
+        super().__init__(title, author)
+        self.price = price
+
+    def display(self):
+        print("Title: " + self.title + "\nAuthor: " + self.author + "\nPrice: " + str(self.price))
+
+
+title = input()
+author = input()
+price = int(input())
+new_novel = MyBook(title, author, price)
+new_novel.display()

13 - Abstract Classes/Solution.rb

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+class Book
+    attr_accessor :title
+    attr_accessor :author
+
+    def initialize(title, author)
+        raise 'You cannot instantiate an abstract class.'
+    end
+
+    def display
+        raise 'You must override this method in your implementing class.'
+    end
+end
+
+class MyBook < Book
+    attr_accessor :price
+
+    def initialize(title, author, price)
+        @title = title
+        @author = author
+        @price = price
+    end
+
+    def display()
+        print "Title: #{self.title}"
+        print "Author: #{self.author}"
+        print "Price: #{self.price}"
+    end
+end
+
+title = gets
+author = gets
+price = gets
+
+new_novel = MyBook.new(title, author, price)
+new_novel.display