using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        int[] libNo = {1,2,3};

        string[] auth = {"Apple","Banana","Calamansi"};

        String[] tle = {"Apple trees","Banana cake", "Calamansi juice"};

        //Console.WriteLine("Hello World");

        Library lib = new Library();

        //Library lib = new Library(libNo[0], auth[0],tle[0]);

        lib.display();

        //lib.dislpayBook();

        String num = Console.ReadLine();

        if (num.Equals("1")) 

        {

            //Library lib1 = new Library(libNo[0], auth[0],tle[0]);

            //lib1.dislpayBook();

            for (int i = 0; i > libNo.Length; i++)

        }

    }

}

class Library //Foo

{

    public int id;

    public string author;

    public string title;

    public Library (int id, string author, string title) 

    {

        this.id = id;

        this.author = author;

        this.title = title;

    }

    public Library () 

    {

        this.id = 0;

        this.author = "none";

        this.title = "none";

    }

    public void dislpayBook() 

    {

        Console.WriteLine("ID: " + this.id);

        Console.WriteLine("Title: " + this.title);

        Console.WriteLine("Author: " + this.author);

    }

    public void display()

    {

        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");

    }

} 

/*struct Book

    {

        public int id;

        private string author;

        private string title;

    }*/