using System;

public class Program

{

    public static void Main()

    {

        var myString = "344.93873";

        var myDouble = double.Parse(myString);

        var myFloat = float.Parse(myString);

        Console.WriteLine(myDouble);

        Console.WriteLine(myDouble.ToString("G64"));

        Console.WriteLine(myFloat);

        Console.WriteLine(myFloat.ToString("G64"));

    }

}