Test, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            ulong lValue = 10648738977740919977;
            double dValue = 10648738977740919977;
            byte[] bytesFromLong = BitConverter.GetBytes(lValue);
            byte[] bytesFromDouble = BitConverter.GetBytes(dValue);
            byte[] bytesFromImplicitDouble = BitConverter.GetBytes((double)10648738977740919977);

string HexAlphabet = "0123456789ABCDEF";
            string res = "Original Number : 10648738977740919977\nLong Bytes : 0x";
            foreach (byte b in bytesFromLong)
            {
                res += HexAlphabet[(int)(b >> 4)] + HexAlphabet[(int)(b & 0xF)];
            }
            res += "\nDouble Bytes : 0x";
            foreach (byte b in bytesFromDouble)
            {
                res += HexAlphabet[(int)(b >> 4)] + HexAlphabet[(int)(b & 0xF)];
            }
            res += "\nImplicit Double Bytes : 0x";
            foreach (byte b in bytesFromImplicitDouble)
            {
                res += HexAlphabet[(int)(b >> 4)] + HexAlphabet[(int)(b & 0xF)];
            }

dValue = BitConverter.ToDouble(bytesFromDouble, 0);
            res += "\nDouble read from Double bytes : " + String.Format("{0:0.#}", dValue);
            dValue = BitConverter.ToDouble(bytesFromImplicitDouble, 0);
            res += "\nDouble read from Implicit Double bytes : " + String.Format("{0:0.#}",dValue);

Console.WriteLine(res);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,3 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 2, absolute service time: 0,43 sec