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  1. using System;
  2. using System.Runtime.InteropServices;
  3.  
  4. [StructLayout(LayoutKind.Explicit)]
  5. struct Float64
  6. {
  7.   public Float64(double x) { ULong = 0; Double = x; }
  8.   public static implicit operator Float64(double x) { return new Float64(x); }
  9.   public static implicit operator double(Float64 x) { return x.Double; }
  10.  
  11.   [FieldOffset(0)] public double Double;
  12.   [FieldOffset(0)] public ulong  ULong;
  13.  
  14.   public ulong Mantissa
  15.   {
  16.     get { return ULong & 0xFFFFFFFFFFFFF; }
  17.     set { ULong = ULong & ~0xFFFFFFFFFFFFFULL | value & 0xFFFFFFFFFFFFFULL; }
  18.   }
  19.  
  20.   public uint Exp
  21.   {
  22.     get { return (uint)((ULong >> 52) & 0x7FF); }
  23.     set { ULong = ULong & 0x800FFFFFFFFFFFFFULL | ((ulong)(value & 0x7FF) << 52); }
  24.   }
  25.  
  26.   public uint Sign
  27.   {
  28.     get { return (uint)(ULong >> 63); }
  29.     set { ULong = ULong & 0x7FFFFFFFFFFFFFFFULL | ((ulong)value << 63); }
  30.   }
  31. }
  32.  
  33. public class Test
  34. {
  35.   private static void Print(Float64 x)
  36.   {
  37.     Console.WriteLine("{0,7} {1:X16} s={4} m={2:X13} e={3:X3}", x.Double, x.ULong, x.Mantissa, x.Exp, x.Sign);
  38.   }
  39.  
  40.   public static void Main()
  41.   {
  42.   	foreach (var d in new double [] { 0,1,-1,2,-2,3,-3,3.25,-3.25 })
  43.   	  Print(d);
  44.  
  45.   	Float64 x = 1;
  46. 	Print(x);
  47. 	++x.Exp; Print(x); // 2
  48. 	x.Sign = 1; Print(x); // -2
  49. 	x.Mantissa += 1ULL << 51; Print(x); // -3
  50. 	--x.Exp; Print(x); // -1.5
  51.   }
  52. }
Success #stdin #stdout 0s 131520KB
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stdin
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Standard input is empty
stdout
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      0 0000000000000000 s=0 m=0000000000000 e=000
      1 3FF0000000000000 s=0 m=0000000000000 e=3FF
     -1 BFF0000000000000 s=1 m=0000000000000 e=3FF
      2 4000000000000000 s=0 m=0000000000000 e=400
     -2 C000000000000000 s=1 m=0000000000000 e=400
      3 4008000000000000 s=0 m=8000000000000 e=400
     -3 C008000000000000 s=1 m=8000000000000 e=400
   3.25 400A000000000000 s=0 m=A000000000000 e=400
  -3.25 C00A000000000000 s=1 m=A000000000000 e=400
      1 3FF0000000000000 s=0 m=0000000000000 e=3FF
      2 4000000000000000 s=0 m=0000000000000 e=400
     -2 C000000000000000 s=1 m=0000000000000 e=400
     -3 C008000000000000 s=1 m=8000000000000 e=400
   -1.5 BFF8000000000000 s=1 m=8000000000000 e=3FF
https://ideone.com/wGW2qq
language:
C# (gmcs 5.20.1)
created:
5 years ago
visibility:
public

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