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From: steve@diana.miranova.com (Steven L. Baur)
Newsgroups: comp.unix.bsd.freebsd.misc,gnu.emacs.help
Subject: Re: Floating point arithmetic in ELisp.
Date: 03 Nov 1995 14:25:34 -0800
Organization: Miranova Systems, Inc.
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In-reply-to: gdr11@cl.cam.ac.uk's message of 03 Nov 1995 16:30:02 GMT
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>>>>> "Gareth" == Gareth Rees <gdr11@cl.cam.ac.uk> writes:
> John D. Boggs <jdb@robigo.winternet.com> wrote:
>> I am teaching myself LISP using the lisp interaction mode in
>> Emacs, and it doesn't seem to like floating point arithmetic.
>> For instance, the expression (+ 3.14 2.71) returns
>> 5.8499999999999996. I was curious, is this typical of Emacs
>> 19.29, or is it a result of running under
>> FreeBSD-2.0.5-950622-SNAP? I don't foresee needing floating
>> point with what I have in mind, but you never know ...
Gareth> What happened here was that the number 5.85 is not
Gareth> representible in whatever floating-point format Emacs
Gareth> uses.
It is Emacs/system dependent.
(On a Linux 1.2/a.out system -- as typed in a Lisp Interaction buffer)
emacs-version
"19.13 XEmacs Lucid"
(+ 3.14 2.71)
5.85
emacs-version
"19.28.1"
(+ 3.14 2.71)
5.8499999999999996
--
steve@miranova.com baur