C# Programming (Provide output)

USING THE PROGRAM BELOW

Test the two new methods in class TestBookDB

1) In class BookDB, add one method public void ProcessNonPaperbackBooks(ProcessBookDelegate processBook)

2) In class BookDB, add one method public void removeBook(string title, ProcessBookDelegate processBook), which will remove a book and print out the detailed book of the book including title, author, and price

// A set of classes for handling a bookstore: namespace Bookstore { using System.Collections;

// Describes a book in the book list: public struct Book { public string Title; // Title of the book. public string Author; // Author of the book. public decimal Price; // Price of the book. public bool Paperback; // Is it paperback?

public Book(string title, string author, decimal price, bool paperBack) { Title = title; Author = author; Price = price; Paperback = paperBack; } }

// Declare a delegate type for processing a book: public delegate void ProcessBookDelegate(Book book);

// Maintains a book database. public class BookDB { // List of all books in the database: ArrayList list = new ArrayList();

// Add a book to the database: public void AddBook(string title, string author, decimal price, bool paperBack) { list.Add(new Book(title, author, price, paperBack)); }

// Call a passed-in delegate on each paperback book to process it: public void ProcessPaperbackBooks(ProcessBookDelegate processBook) { foreach (Book b in list) { if (b.Paperback) // Calling the delegate: processBook(b); } } } }

// Using the Bookstore classes: namespace BookTestClient { using Bookstore;

// Class to total and average prices of books: class PriceTotaller { int countBooks = 0; decimal priceBooks = 0.0m;

internal void AddBookToTotal(Book book) { countBooks += 1; priceBooks += book.Price; }

internal decimal AveragePrice() { return priceBooks / countBooks; } }

// Class to test the book database: class TestBookDB { // Print the title of the book. static void PrintTitle(Book b) { System.Console.WriteLine(" {0}", b.Title); }

// Execution starts here. static void Main() { BookDB bookDB = new BookDB();

// Initialize the database with some books: AddBooks(bookDB);

// Print all the titles of paperbacks: System.Console.WriteLine("Paperback Book Titles:");

// Create a new delegate object associated with the static // method Test.PrintTitle: bookDB.ProcessPaperbackBooks(PrintTitle);

// Get the average price of a paperback by using // a PriceTotaller object: PriceTotaller totaller = new PriceTotaller();

// Create a new delegate object associated with the nonstatic // method AddBookToTotal on the object totaller: bookDB.ProcessPaperbackBooks(totaller.AddBookToTotal);

System.Console.WriteLine("Average Paperback Book Price: ${0:#.##}", totaller.AveragePrice()); }

// Initialize the book database with some test books: static void AddBooks(BookDB bookDB) { bookDB.AddBook("The C Programming Language", "Brian W. Kernighan and Dennis M. Ritchie", 19.95m, true); bookDB.AddBook("The Unicode Standard 2.0", "The Unicode Consortium", 39.95m, true); bookDB.AddBook("The MS-DOS Encyclopedia", "Ray Duncan", 129.95m, false); bookDB.AddBook("Dogbert's Clues for the Clueless", "Scott Adams", 12.00m, true); } } } /* Output: Paperback Book Titles: The C Programming Language The Unicode Standard 2.0 Dogbert's Clues for the Clueless Average Paperback Book Price: $23.97 */