using System;

public class Program

{

    public static void Main()

    {

            double x = 0.555555555555555555555555;

​

            // Cast to a decimal

            decimal y = Convert.ToDecimal(x);

​

            // Use strings to compare values of double and decimal, ensuring no precision loss

            string x_string = x.ToString("G99");

            string y_string =  y.ToString("G99");

            Console.WriteLine(x_string);

            Console.WriteLine(y_string);

    }

}