C# Single NaN

public const float NaN

// w ww.  j  ava2 s .com
using System;
public class MainClass{
  public static void Main(String[] argv){  
    float zero = 0.0f;
    Console.WriteLine("{0} / {1} = {2}", zero, zero, zero/zero);
    
    
    float nan1 = Single.NaN;
    
    Console.WriteLine("{0} + {1} = {2}", 3, nan1, 3 + nan1);
    Console.WriteLine("Abs({0}) = {1}", nan1, Math.Abs(nan1));
    
    float result = Single.NaN;
    Console.WriteLine("{0} = Single.NaN: {1}", 
                      result, result == Single.NaN);
    
    zero = 0;
    
    // This condition will return false. 
    if ((0 / zero) == Single.NaN)
    {
        Console.WriteLine("0 / 0 can be tested with Single.NaN.");
    }
    else
    {
        Console.WriteLine("0 / 0 cannot be tested with Single.NaN; use Single.IsNan() instead.");
    }

  }
}