static void Main(string[] args)
{
BookDb bookdb = new BookDb();
processBookCallDeligates pd = new processBookCallDeligates(sellBook);
AddBook(bookdb);
pd += RentBook;
pd += scrapBook;
bookdb.processPaperbackBook(pd);
}
static void AddBook(BookDb bookDb)
{
bookDb.AddBook("three men in a boat", "undefined", 300, true);
bookDb.AddBook("the stroy of my life", "hellen keller", 350, true);
}