using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Explicit)]
struct Float64
{
  public Float64(double x) { ULong = 0; Double = x; }
  public static implicit operator Float64(double x) { return new Float64(x); }
  public static implicit operator double(Float64 x) { return x.Double; }

  [FieldOffset(0)] public double Double;
  [FieldOffset(0)] public ulong  ULong;
  
  public ulong Mantissa
  {
    get { return ULong & 0xFFFFFFFFFFFFF; }
    set { ULong = ULong & ~0xFFFFFFFFFFFFFULL | value & 0xFFFFFFFFFFFFFULL; }
  }
  
  public uint Exp
  {
    get { return (uint)((ULong >> 52) & 0x7FF); }
    set { ULong = ULong & 0x800FFFFFFFFFFFFFULL | ((ulong)(value & 0x7FF) << 52); }
  }

  public uint Sign
  {
    get { return (uint)(ULong >> 63); }
    set { ULong = ULong & 0x7FFFFFFFFFFFFFFFULL | ((ulong)value << 63); }
  }
}

public class Test
{
  private static void Print(Float64 x)
  {
    Console.WriteLine("{0,7} {1:X16} s={4} m={2:X13} e={3:X3}", x.Double, x.ULong, x.Mantissa, x.Exp, x.Sign);
  }

  public static void Main()
  {
  	foreach (var d in new double [] { 0,1,-1,2,-2,3,-3,3.25,-3.25 })
  	  Print(d);
  	  
  	Float64 x = 1;
	Print(x);
	++x.Exp; Print(x); // 2
	x.Sign = 1; Print(x); // -2
	x.Mantissa += 1ULL << 51; Print(x); // -3
	--x.Exp; Print(x); // -1.5
  }
}