private void okclick(object sender, RoutedEventArgs e)
        {
            cliwrapper.wrapper sample;
            sample = new cliwrapper.wrapper();
            string           message = Convert.ToString(sample.Eval(input.Text));
            string           caption = "Result";
            MessageBoxButton buttons = MessageBoxButton.OK;

            MessageBox.Show(message, caption, buttons);
        }
        static void Main(string[] args)
        {
            cliwrapper.wrapper sample;
            sample = new cliwrapper.wrapper();
            String input;

            while (true)
            {
                input = Console.ReadLine();
                Console.WriteLine(sample.Eval(input));
            }
        }