using System;

using System.Collections;

using System.Text;

​

namespace PrefinalTask {

  public class Program {

​

    static bool isAvailable1 = true;

    static bool isAvailable2 = true;

    static ArrayList books = new ArrayList();

    static string[] availability = new string[2];

    public static void Main() {

​

      //Add book details in the arraylist

​

      availability[0] = "Available\n";

      availability[1] = "Available\n";

      Foo bookInfo1 = new Foo(1, "ABC", "CBD");

      Foo bookInfo2 = new Foo(2, "EFG", "GFE");

      books.Add(bookInfo1.getBook_iD() + "\n" + bookInfo1.getAuthor() + "\n" + bookInfo1.getTitle() + "\n");

      books.Add(bookInfo2.getBook_iD() + "\n" + bookInfo2.getAuthor() + "\n" + bookInfo2.getTitle() + "\n");

​

      while (true) {

        Console.WriteLine("Micro Library System.");

        Console.WriteLine("=====================");

        Console.WriteLine("1. List");

        Console.WriteLine("2. Borrow");

        Console.WriteLine("3. Return");

        Console.WriteLine();

        Console.WriteLine("0. Exit");

​

        string choice = Console.ReadLine();

​

        if (choice.Equals("1")) {

​

          bookList();

        }

        if (choice.Equals("2")) {

​

          bookBorrow();

​

        }

​

        if (choice.Equals("3")) {

​

          bookReturn();

​

        }

​

        if (choice.Equals("0")) {

​

          System.Environment.Exit(0);

​

        }

​

        //Process User Input 

      }

    }

    //Add static methods to allow listing, borrowing, and returning of books.

​

    public static void bookList() {

​

      for (int i = 0; i < books.Count; i++) {

        Console.WriteLine(availability[i] + books[i]);

​

      }

    }

​

    public static void bookBorrow() {

​

      Console.WriteLine("Enter Book ID:");

      int bookID = (int) Convert.ToInt64(Console.ReadLine());

      int numberOfBook = books.Count;

​

      if (bookID != 0 && bookID <= numberOfBook) {

​

        if (bookID == 1 && isAvailable1) {

          Console.WriteLine(books[bookID - 1]);

          Console.WriteLine("Success");

          availability[bookID - 1] = "Not Available\n";

          isAvailable1 = false;

​

        } else if (bookID == 2 && isAvailable2) {

          Console.WriteLine(books[bookID - 1]);

          Console.WriteLine("Success");

          availability[bookID - 1] = "Not Available\n";

          isAvailable2 = false;

​

        } else {

​

          Console.WriteLine("Not Available");

        }

​

      } else {

​

        Console.WriteLine("No such thing");

      }

​

    }

​

    public static void bookReturn() {

      Console.WriteLine("Enter Book ID:");

      int bookID = (int) Convert.ToInt64(Console.ReadLine());

      int numberOfBook = books.Count;

​

      if (bookID != 0 && bookID <= numberOfBook) {

​

        if (bookID == 1 && !isAvailable1) {

          Console.WriteLine(books[bookID - 1]);

          Console.WriteLine("Book successfully returned!");

          availability[bookID - 1] = "Available\n";

          isAvailable1 = true;

​

        } else if (bookID == 2 && !isAvailable2) {

          Console.WriteLine(books[bookID - 1]);

          Console.WriteLine("Book successfully returned!");

          availability[bookID - 1] = "Available\n";

          isAvailable2 = true;

​

        } else {

​

          Console.WriteLine("Not Available/Not borrowed yet");

        }

​

      } else {

​

        Console.WriteLine("No such thing");

      }

​

    }

  }

  public class Foo {

​

    //Add a member struct Book

    Book book = new Book();

​

    public Foo(int id, string author, string title) {

​

      book.setID(id);

      book.setTitle(title);

      book.setAuthor(author);

​

    }

​

    public string getBook_iD() {

​

      return "ID:" + " " + book.Id;

    }

​

    public string getAuthor() {

​

      return "Author:" + " " + book.authorName;

    }

​

    public string getTitle() {

​

      return "Title:" + " " + book.bookTitle;

    }

​

  }

  struct Book {

    private int id;

    private string author;

    private string title;

​

    public Book(int id, string author, string title) {

      this.id = id;

      this.author = author;

      this.title = title;

​

    }

​

    public void setID(int id) {

​

      this.id = id;

    }

​

    public void setAuthor(string author) {

​

      this.author = author;

    }

​

    public void setTitle(string name) {

​

      this.title = name;

    }

​

    public int Id {

      get {

        return id;

      }

    }

    public string authorName {

      get {

        return author;

      }

    }

    public string bookTitle {

      get {

        return title;

      }

    }

​

    //complete the struct book with constructor

    //and other necessary method(s)

  }

}

​