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namespace ConsoleApplication41
{
    class Program
    {
        static void Main(string[] args)
        {
            Lib A = new Lib();
            Book B = new Book("1", "2", "3", 4, 5.5);
            A.arrLib[0] = B;
            Console.WriteLine("количество элементов в массиве");
            Console.WriteLine("{0}", A.arrLib.Length);
            Console.WriteLine("Добавить/редактировать книгу");
            A.editBook();
            Console.WriteLine("Просмотр книги");
            A.showBook();
            Console.WriteLine("Суммарная цена экземпляров книг");
            A.bookSum();
 
 
        }
    }
}
 

prog.cs(7,13): error CS0246: The type or namespace name `Lib' could not be found. Are you missing an assembly reference?
prog.cs(8,13): error CS0246: The type or namespace name `Book' could not be found. Are you missing an assembly reference?
prog.cs(9,27): error CS0841: A local variable `B' cannot be used before it is declared
prog.cs(9,13): error CS0841: A local variable `A' cannot be used before it is declared
prog.cs(10,13): error CS0103: The name `Console' does not exist in the current context
prog.cs(11,13): error CS0103: The name `Console' does not exist in the current context
prog.cs(12,13): error CS0103: The name `Console' does not exist in the current context
prog.cs(13,13): error CS0841: A local variable `A' cannot be used before it is declared
prog.cs(14,13): error CS0103: The name `Console' does not exist in the current context
prog.cs(15,13): error CS0841: A local variable `A' cannot be used before it is declared
prog.cs(16,13): error CS0103: The name `Console' does not exist in the current context
prog.cs(17,13): error CS0841: A local variable `A' cannot be used before it is declared
Compilation failed: 12 error(s), 0 warnings

Standard output is empty