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Re: [bug-gawk] Special Comparisons: nan == nan


From: Andrew J. Schorr
Subject: Re: [bug-gawk] Special Comparisons: nan == nan
Date: Mon, 7 Aug 2017 20:24:36 -0400
User-agent: Mutt/1.5.21 (2010-09-15)

Hi Dan,


On Mon, Aug 07, 2017 at 05:10:08PM -0700, Daniel Pettet wrote:
> I don't know which version I saw this or how complete the treatment of NaNs
> was.  You could try back before version 4.0.0.

As far back as gawk-1.01, the test returns true if you are comparing a variable
to itself, based on source code inspection. So I doubt this ever worked the way
you'd like for any version of gawk.

> The distinction between
> comparing two NaNs and comparing a NaN with itself is interesting.

I imagine this may be the case you were thinking of when you said
it used to work differently. This changed in 4.1.

Regards,
Andy



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