private static void Main()
        {
            Console.WriteLine("Choose the operation");
            Console.WriteLine("1 - OCP");
            Console.WriteLine("2 - LSP");

            var option = Console.ReadKey();

            switch (option.KeyChar)
            {
            case '1':
                ATM.Operations();
                break;

            case '2':
                AreaCalculation.Calculate();
                break;
            }
        }
 private static void Main()
 {
     AreaCalculation.Calculate();
 }