[Haskell-cafe] 0/0 > 1 == False
Cristian Baboi
cristi at ot.onrc.ro
Fri Jan 11 01:30:45 EST 2008
On Thu, 10 Jan 2008 10:22:03 +0200, Mitar <mmitar at gmail.com> wrote:
> Hi!
>
> Why is 0/0 (which is NaN) > 1 == False and at the same time 0/0 < 1 ==
> False. This means that 0/0 == 1? No, because also 0/0 == 1 == False.
>
> I understand that proper mathematical behavior would be that as 0/0 is
> mathematically undefined that 0/0 cannot be even compared to 1.
>
> There is probably an implementation reason behind it, but do we really
> want such "hidden" behavior? Would not it be better to throw some kind
> of an error?
NaN is not 'undefined'
(0/0) /= (0/0) is True
(0/0) == (0/0) is False
You can use these to test for NaN.
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