Miguel Barao <mjsb@ramses.inesc-id.pt> (Thu, 27 Oct 2005 15:24:54 +0100):
> The answer is in 'man signbit'.
>
> signbit is probably just ANDing your float value with 2^31=0x80000000 which
> reads -2147483648 if considered as a signed int (like in your printf).

Yes.  The manpage doesn't say it returns 1, but it returns non-zero.
-2147483648 is non-zero.  You need to check if the value is !0, not if
the value is 1.  By the way, this holds for many boolean functions.

Regards.



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