using System;

public class Program

{

    public static void Main()

    {

        double val = 20.0;

        //string arg = "123.45";  // will return true

        string arg = "123.45s";  // will return false

        bool ret = double.TryParse(arg, out val);

        if (ret == true)

        {

            Console.WriteLine("val = {0}", val);

        }

        else

        {

            Console.WriteLine("val = {0}", val);

        }

        Console.WriteLine(ret);

    }

}