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Re: -0.0 versus 0.0

From: Andrea Fedeli
Subject: Re: -0.0 versus 0.0
Date: Sun, 22 Feb 2009 17:42:48 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20081204 SeaMonkey/1.1.14

Dave Sworin wrote:

?- R is 0, THETA is 3.1415, X is R * cos(THETA).

R = 0

THETA = 3.1415000000000002

X = -0.0

A .5 cents worth comment: curiously, the exact same behavior is exposed by SWI 5.6.50 and Ciao 1.10p8, at least on my machine/OS combination (Athlon XP 2800+/OpenSuse 11.0). It very roughly seems like something related either to a shared library or to a common portion of source code.



Andrea Fedeli

Dawn, n.:
        The time when men of reason go to bed.
                -- Ambrose Bierce, "The Devil's Dictionary"

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