GNU bug report logs - #920
In CVS Emacs, calc-eval gives multiplication higher precidence than division

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Package: emacs;

Reported by: Stefan Monnier <monnier <at> iro.umontreal.ca>

Date: Sun, 7 Sep 2008 19:55:05 UTC

Severity: normal

Merged with 914, 915, 918, 921, 923, 924, 928, 929, 930, 932, 933, 934, 937, 941, 944

Done: Chong Yidong <cyd <at> stupidchicken.com>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: jay.p.belanger <at> gmail.com
Cc: Francis Litterio <flitterio <at> gmail.com>, bug-gnu-emacs <at> gnu.org,
        emacs-devel <at> gnu.org
Subject: Re: In CVS Emacs, calc-eval gives multiplication higher precidence than division
Date: Sun, 07 Sep 2008 15:46:52 -0400

> That's not a bug.  While many systems give division a higher precendence
> than multiplication, that isn't a universal rule.

Actually, I don't know of any system that gives higher precedence to
division.  The general rule that (AFAIK) all programming languages
follow (other than those that don't use infix-with-precedence, such as
Lisp and Smalltalk) is that * and / have the same precedence (and are
left associative).

I think Calc is plainly wrong is giving higher precedence to the
multiplication because it's completely non standard.  But since I don't
use Calc much and since it's been that way for a while, I won't fight
for it.


        Stefan
This bug report was last modified 16 years and 257 days ago.

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