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Date: Wed, 6 Mar 2013 01:49:06 -0600
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Subject: Re: Printing sign of NaN.
From: Rugxulo <rugxulo AT gmail DOT com>
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Hi,

On Tue, Mar 5, 2013 at 3:51 PM, Eli Zaretskii <eliz AT gnu DOT org> wrote:
>> Date: Tue, 05 Mar 2013 20:47:25 +0100
>> From: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
>>
>> ONFY while I was testing trunc() I noted that printf did not print the
>> sign of NaN.  The committed small patch  below fixes the issue.
>
> Isn't NaN always negative?  Do you succeed in printing both negative
> and positive NaN with this patch?

No idea, but here's what Wikipedia says:

http://en.wikipedia.org/wiki/NaN

"
In IEEE 754 standard-conforming floating point storage formats, NaNs
are identified by specific, pre-defined bit patterns unique to NaNs.
The sign bit does not matter. Binary format NaNs are represented with
the exponential field filled with ones (like infinity values), and
some non-zero number in the significand (to make them distinct from
infinity values).
"