static void Main(string[] args)
{
BookRepos db = new BookRepos();
List <Book> books = db.GetListbook();
foreach (Book b in books)
{
Console.WriteLine(b.ToString());
}
Sale sale = new Sale(books[0]);
bool flag = db.AddSale(books[0]);
if (flag == true)
{
Console.WriteLine("The addition of the sale was completed successfully");
}
else
{
Console.WriteLine("Error!!!");
}
}