using System;

public class Program

{

    public static void Main(){ 

        //create a 1D array with 5 places for books

        Book[] Library = new Book[7];

        //Book 1

        Library[0].ISBN = "9781408855652";

        Library[0].Title = "The Philosopher's Stone" ;

        Library[0].Year = 1997;

        Library[0].Price = 4.99;

        Library[1].ISBN = "1408855666";

        Library[1].Title = "The Chamber Of Secrets" ;

        Library[1].Year = 1998;

        Library[1].Price = 5.89;

        Library[2].ISBN = "1408855674";

        Library[2].Title = "The Prisoner of Azkaban" ;

        Library[2].Year = 1999;

        Library[2].Price = 5.36;

        Library[3].ISBN = "1408855682";

        Library[3].Title = "The Goblet Of Fire" ;

        Library[3].Year = 1997;

        Library[3].Price = 3.64;

        Library[4].ISBN = "9781408855690";

        Library[4].Title = "The Order of The Phoenix" ;

        Library[4].Year = 2003;

        Library[4].Price = 4.45;

        Library[5].ISBN = "9781408855706";

        Library[5].Title = "The Half-Blood Prince" ;

        Library[5].Year = 2005;

        Library[5].Price = 8.69;

        Library[6].ISBN = "1408855712";

        Library[6].Title = "The Half-Blood Prince" ;

        Library[6].Year = 2007;

        Library[6].Price = 6.54;

        //Output Books

        PrintBook(Library[0]);

        PrintBook(Library[1]);

        PrintBook(Library[2]);

        PrintBook(Library[3]);

        PrintBook(Library[4]);

        PrintBook(Library[5]);

        PrintBook(Library[6]);

            Console.Write("Enter ISBN to search: ");

         string inputISBN = Console.ReadLine();

          if (string.IsNullOrWhiteSpace(inputISBN))

        {

            Console.WriteLine("Error: ISBN cannot be empty.");

            return;

        }

              bool found = false;

        foreach (var book in Library)

        {

            if (book.ISBN == inputISBN)

            {

                PrintBook(book);

                found = true;

                break;

            }

        }

​

        if (!found)

        {

            Console.WriteLine("Book not found.");

        }

    }//end of main 

    //declare a record structure

    public struct Book

    {

        public string ISBN ;

        public string Title;

        public int Year ;

        public double Price ;

    }//end of struct

    //Procedure to output the contents of the record. Needs a record passed to it

    public static void PrintBook(Book record)

    { 

        Console.WriteLine("ISBN: " + record.ISBN);

        Console.WriteLine("Title " + record.Title); 

        Console.WriteLine("Year " + record.Year); 

          if (record.Price >= 5)

        {

            Console.WriteLine("Price: £" + record.Price);

        }

​

        Console.WriteLine();

    }//end of PrintAccount 

}//end of program