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  1. using System;
  2.  
  3. public class Example
  4. {
  5.    public static void Main()
  6.    {
  7.       double[] values = { 
  8.       	//12345678901234567
  9.         0.10000000000000001,
  10.         0.10000000000000002
  11.         };
  12.  
  13.       Console.WriteLine("{0:r} = {1:r}: =:{2} ae:{3} re:{4} hmd1:{5} hmd0:{6}", 
  14.                         values[0], values[1],  
  15.                         values[0].Equals(values[1]),
  16.                         AlmostEqual(values[0], values[1]),
  17.                         ReallyEqual(values[0], values[1]),
  18.                         HasMinimalDifference(values[0], values[1], 1),
  19.                         HasMinimalDifference(values[0], values[1], 0));
  20.       Console.WriteLine();
  21.    }
  22.  
  23.    public static bool AlmostEqual(double x, double y) {
  24.       double epsilon = Math.Max(Math.Abs(x), Math.Abs(y)) * 1E-15;
  25.       return Math.Abs(x - y) <= epsilon;
  26.    }
  27.  
  28.    public static bool ReallyEqual(double x, double y) {
  29.    	  return (x == y);
  30.    }
  31.  
  32.    public static bool HasMinimalDifference(double value1, double value2, int units) {
  33.       long lValue1 = BitConverter.DoubleToInt64Bits(value1);
  34.       long lValue2 = BitConverter.DoubleToInt64Bits(value2);
  35.  
  36.       // If the signs are different, return false except for +0 and -0. 
  37.       if ((lValue1 >> 63) != (lValue2 >> 63))
  38.       {
  39.          if (value1 == value2)
  40.             return true;
  41.  
  42.          return false;
  43.       }
  44.  
  45.       long diff = Math.Abs(lValue1 - lValue2);
  46.       Console.WriteLine("HMD: {0} {1} {2} {3}",
  47.                         lValue1, lValue2, diff, units);
  48.  
  49.       if (diff <= (long) units)
  50.          return true;
  51.  
  52.       return false;
  53.    }
  54.  
  55. }
  56.  
  57.  
  58.  
Success #stdin #stdout 0.04s 34712KB
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stdin
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Standard input is empty
stdout
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HMD: 4591870180066957722 4591870180066957723 1 1
HMD: 4591870180066957722 4591870180066957723 1 0
0.1 = 0.10000000000000002: =:False ae:True re:False hmd1:True hmd0:False
https://ideone.com/fwsq5o
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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