using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Attempting to round-trip a Double with 'R':");

        double initialValue = 0.6822871999174;

        string valueString = initialValue.ToString("R",

                                                   CultureInfo.InvariantCulture);

        double roundTripped = double.Parse(valueString,

                                           CultureInfo.InvariantCulture);

        Console.WriteLine("{0:R} = {1:R}: {2}\n",

                          initialValue, roundTripped, initialValue.Equals(roundTripped));

​

        Console.WriteLine("Attempting to round-trip a Double with 'G17':");

        string valueString17 = initialValue.ToString("G17",

                                                     CultureInfo.InvariantCulture);

        double roundTripped17 = double.Parse(valueString17,

                                             CultureInfo.InvariantCulture);

        Console.WriteLine("{0:R} = {1:R}: {2}\n",

                          initialValue, roundTripped17, initialValue.Equals(roundTripped17));

    }

}