\"Using C#: Create a Windows Form Application named BookDemo that declares and d

Question

"Using C#: Create a Windows Form Application named BookDemo that declares and demonstrates objects of the Book class and its descendents. The Book class includes auto-implemented properties for the International Standard Book Number (ISBN), title, author, and price. Create a child class named TextBook that includes a grade level and a CoffeeTableBook child class that contains no additional fields or properties. In the child classes, override the accessor that sets a Book's price so that TextBooks must be priced between $20.00 and $80.00, inclusive, and CoffeeTableBooks must be priced between $35.00 and $100.00, inclusive. Be sure to use valid and invalid values when testing the child class properties."

In the Book class you created above, overload the Object class Equals() method to consider two Books equal if they have the same IBSN. Create a program that declares three books; two should have the same IBSN and one should have a different one. Demonstrate that the Equals() method works correctly to compare the Books.

Explanation / Answer

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace BookDemo { class Book { private int isbn; private string title; private string author; protected double price; public int ISBN { get { return isbn; } set { isbn = value; } } public string Title { get { return this.title; } set { this.title = value; } } public string Author { get { return this.author; } set { this.author = value; } } public virtual double Price { get { return price; } set { price = value; } } } class TextBook : Book { private int grade; public int Grade { get { return grade; } set { grade = value; } } override public double Price { set { double Minimum = 20.00; double Maximum = 80.00; if (value Maximum) price = Maximum; else price = value; } } } class CoffeeTableBook : Book { override public double Price { set { double Minimum = 35.00; double Maximum = 100.00; if (value Maximum) price = Maximum; else price = value; } } } public class BookDemo { public static void Main() { Book book1 = new Book(); Book book2 = new Book(); TextBook book3 = new TextBook(); TextBook book4 = new TextBook(); TextBook book5 = new TextBook(); CoffeeTableBook book6 = new CoffeeTableBook(); CoffeeTableBook book7 = new CoffeeTableBook(); CoffeeTableBook book8 = new CoffeeTableBook(); book1.ISBN = 746382918; book1.Title = "This is Life"; book1.Author = "One, Any"; book1.Price = 32; book2.ISBN = 847362918; book2.Title = "Up and Down"; book2.Author = "One, Any"; book2.Price = 113; book3.ISBN = 948367123; book3.Title = "Algrebra"; book3.Author = "Guy, That"; book3.Price = 15; book4.ISBN = 832749210; book4.Title = "Geometry"; book4.Author = "Guy, That"; book4.Price = 90; book5.ISBN = 109238750; book5.Title = "English"; book5.Author = "Girl, That"; book5.Price = 45; book6.ISBN = 923850178; book6.Title = "Sports"; book6.Author = "Guy, Some"; book6.Price = 30; book7.ISBN = 622934749; book7.Title = "Romance"; book7.Author = "Girl, Some"; book7.Price = 105; book8.ISBN = 847392301; book8.Title = "Politics"; book8.Author = "Guy, A"; book8.Price = 65; Console.WriteLine(); Console.WriteLine(" {0} - '{1}' by : {2} will cost {3}", book1.ISBN, book1.Title, book1.Author, book1.Price.ToString("C")); Console.WriteLine(); Console.WriteLine(" {0} - '{1}' by : {2} will cost {3}", book2.ISBN, book2.Title, book2.Author, book2.Price.ToString("C")); Console.WriteLine(); Console.WriteLine(" {0} - '{1}' by : {2} will cost {3}", book3.ISBN, book3.Title, book3.Author, book3.Price.ToString("C")); Console.WriteLine(); Console.WriteLine(" {0} - '{1}' by : {2} will cost {3}", book4.ISBN, book4.Title, book4.Author, book4.Price.ToString("C")); Console.WriteLine(); Console.WriteLine(" {0} - '{1}' by : {2} will cost {3}", book5.ISBN, book5.Title, book5.Author, book5.Price.ToString("C")); Console.WriteLine(); Console.WriteLine(" {0} - '{1}' by : {2} will cost {3}", book6.ISBN, book6.Title, book6.Author, book6.Price.ToString("C")); Console.WriteLine(); Console.WriteLine(" {0} - '{1}' by : {2} will cost {3}", book7.ISBN, book7.Title, book7.Author, book7.Price.ToString("C")); Console.WriteLine(); Console.WriteLine(" {0} - '{1}' by : {2} will cost {3}", book8.ISBN, book8.Title, book8.Author, book8.Price.ToString("C")); Console.ReadLine(); } } }

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