using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;


namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            Book a1 = new Book("Java", 0);
            Console.WriteLine(a1);


            Book a2 = new Book("Android", 15);

            List<Book> listOfBooks = new List<Book>();
            listOfBooks.Add(a1);
            listOfBooks.Add(a2);
            listOfBooks.Sort();

            Console.WriteLine(a1 > a2);
            Console.WriteLine(a1 < a2);

            foreach(Book book in listOfBooks)
            {
                Console.WriteLine(book);
            }
            Console.ReadKey();
        }
    }

    class Book: IComparable<Book>
    {
        string name;
        int pages;

        public Book(string name, int pages)
        {
            this.name = name;
            this.pages = pages;
        }

        public override string ToString()
        {
            return "The book '" + name + "' has " + pages + " pages";
        }

        public bool isEmpty()
        {
            return pages == 0;
        }

        public static bool operator <(Book lhs, Book rhs)
        {
            return lhs.pages < rhs.pages;
        }

        public static bool operator >(Book lhs, Book rhs)
        {
            return lhs.pages > rhs.pages;
        }

        public int CompareTo(Book rhs)
        {
            return name.CompareTo(rhs.name);
        }
    }
}