static void Main(string[] args)
{
Book book = new Book();
CoffeeTableBook coffeeTableBook = new CoffeeTableBook();
TextBook textBook = new TextBook();
Test test = new Test();
test.ISBN = 1;
book.Price = 30;
coffeeTableBook.Price = 10;
textBook.Price = 30;
book.ISBN = 1;
coffeeTableBook.ISBN = 2;
textBook.ISBN = 1;
book.Author = "jos";
coffeeTableBook.Author = "fien";
textBook.Author = "jos";
book.Title = "how to program";
coffeeTableBook.Title = "how to sing";
textBook.Title = "how to program";
Book testbook = Book.TelOp(coffeeTableBook, book);
Console.WriteLine($"{testbook.ISBN} and {testbook} are equal");
if (book.Equals(textBook))
{
Console.WriteLine($"{textBook} and {book} are equal");
}
else
{
Console.WriteLine($"{textBook} and {book} are not equal");
}
}
