fork(1) download
copy 
  1. using System;
  2.  
  3. class DoubleInfo
  4. {
  5.     public long Mantissa;
  6.     public int Exponent;
  7.     public bool IsNegative;
  8.  
  9.     public override string ToString()
  10.     {
  11.         return
  12.             $"Mantissa: {Mantissa:X8}, Exponent: {Exponent}, " +
  13.             $"Sign: {(IsNegative ? '-' : '+')}";
  14.     }
  15. }
  16.  
  17. class Program
  18. {
  19.     static DoubleInfo ExtractInfo(double d)
  20.     {
  21.         if (double.IsInfinity(d) || double.IsNaN(d))
  22.             return null;
  23.  
  24.         var result = new DoubleInfo();
  25.         long bits = BitConverter.DoubleToInt64Bits(d);
  26.  
  27.         result.IsNegative = bits < 0;
  28.         result.Exponent = (int) ((bits >> 52) & 0x7ffL);
  29.         result.Mantissa = bits & 0xfffffffffffffL;
  30.  
  31.         if (result.Exponent == 0) // субнормальные числа
  32.             result.Exponent++;
  33.         else // нормальные числа, добавляем ведущий бит
  34.             result.Mantissa = result.Mantissa | (1L << 52);
  35.  
  36.         result.Exponent -= 1023; // экспонента сдвинута на 1023
  37.         return result;
  38.     }
  39.  
  40.     static void Main(string[] args)
  41.     {
  42.         double d1 = 2.1;
  43.         double d2 = 2;
  44.         double diff = d1 - d2;
  45.         Console.WriteLine($"d1     : {ExtractInfo(d1)}");
  46.         Console.WriteLine($"d2     : {ExtractInfo(d2)}");
  47.         Console.WriteLine($"d1 - d2: {ExtractInfo(diff)}");
  48.     }
  49. }
Success #stdin #stdout 0.04s 23920KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
d1     : Mantissa: 10CCCCCCCCCCCD, Exponent: 1, Sign: +
d2     : Mantissa: 10000000000000, Exponent: 1, Sign: +
d1 - d2: Mantissa: 199999999999A0, Exponent: -4, Sign: +
https://ideone.com/c7u8fp
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!