using System;

namespace ConsoleApplication3
{
    namespace ConsoleApplication
    {
        public class Program
        {
            public static void Main()
            {
                double d = 1.0;
                d -= 0.3;
                d -= 0.2;
                d += 0.2;
                d += 0.2;
                d += 0.2;
                d += 0.2;
                d += 0.2;

                Console.WriteLine("Standard formatting: {0}", d);
                Console.WriteLine("Internal Representation: {0:r}", d);
                Console.WriteLine("Console WriteLine 0 decimals: {0:0}", d);
                Console.WriteLine("0 decimals Math.Round: {0}", Math.Round(d, MidpointRounding.AwayFromZero));
                Console.WriteLine("15 decimals then 0 decimals Math.Round: {0}", Math.Round(Math.Round(d, 15, MidpointRounding.AwayFromZero), MidpointRounding.AwayFromZero));
             }
        }
    }
}