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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Report forwarded to bug-submit-list <at> lists.donarmstrong.com, Emacs Bugs <bug-gnu-emacs <at> gnu.org>:
bug#920; Package emacs. Full text and rfc822 format available.
Acknowledgement sent to Stefan Monnier <monnier <at> iro.umontreal.ca>:
New bug report received and forwarded. Copy sent to Emacs Bugs <bug-gnu-emacs <at> gnu.org>. Full text and rfc822 format available.

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
Information forwarded to bug-submit-list <at> lists.donarmstrong.com, Emacs Bugs <bug-gnu-emacs <at> gnu.org>:
bug#920; Package emacs. Full text and rfc822 format available.
Acknowledgement sent to "Lennart Borgman (gmail)" <lennart.borgman <at> gmail.com>:
Extra info received and forwarded to list. Copy sent to Emacs Bugs <bug-gnu-emacs <at> gnu.org>. Full text and rfc822 format available.

Message #10 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Lennart Borgman (gmail)" <lennart.borgman <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>, 920 <at> debbugs.gnu.org
Cc: jay.p.belanger <at> gmail.com, bug-gnu-emacs <at> gnu.org,
        Francis Litterio <flitterio <at> gmail.com>, emacs-devel <at> gnu.org
Subject: Re: bug#920: In CVS Emacs,	calc-eval gives multiplication higher
 precidence than division
Date: Sun, 07 Sep 2008 22:19:04 +0200

Stefan Monnier wrote:
> 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.


I think there are good reasons fixing it:

- There are enough people out there that are not aware of the precedence
rules. Making calc follow them would help remove that confusion. (And I
would feel safer when crossing bridges.)
- Not following standards makes Emacs harder to use for new users.
Information forwarded to bug-submit-list <at> lists.donarmstrong.com, Emacs Bugs <bug-gnu-emacs <at> gnu.org>:
bug#920; Package emacs. Full text and rfc822 format available.
Acknowledgement sent to "Lennart Borgman (gmail)" <lennart.borgman <at> gmail.com>:
Extra info received and forwarded to list. Copy sent to Emacs Bugs <bug-gnu-emacs <at> gnu.org>. Full text and rfc822 format available.
bug closed, send any further explanations to Stefan Monnier <monnier <at> iro.umontreal.ca> Request was from Chong Yidong <cyd <at> stupidchicken.com> to control <at> emacsbugs.donarmstrong.com. (Sun, 07 Sep 2008 20:35:06 GMT) Full text and rfc822 format available.
Merged 918 920. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> emacsbugs.donarmstrong.com. (Sun, 07 Sep 2008 20:50:07 GMT) Full text and rfc822 format available.
Forcibly Merged 914 915 918 920 921 923 924. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> emacsbugs.donarmstrong.com. (Mon, 08 Sep 2008 02:25:06 GMT) Full text and rfc822 format available.
Forcibly Merged 914 915 918 920 921 923 924 928 929 930. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> emacsbugs.donarmstrong.com. (Mon, 08 Sep 2008 20:35:04 GMT) Full text and rfc822 format available.
Forcibly Merged 914 915 918 920 921 923 924 928 929 930 932 933. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> emacsbugs.donarmstrong.com. (Mon, 08 Sep 2008 21:00:06 GMT) Full text and rfc822 format available.
Forcibly Merged 914 915 918 920 921 923 924 928 929 930 932 933 934. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> emacsbugs.donarmstrong.com. (Mon, 08 Sep 2008 21:00:09 GMT) Full text and rfc822 format available.
Forcibly Merged 914 915 918 920 921 923 924 928 929 930 932 933 934 937. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> emacsbugs.donarmstrong.com. (Mon, 08 Sep 2008 22:30:03 GMT) Full text and rfc822 format available.
Forcibly Merged 914 915 918 920 921 923 924 928 929 930 932 933 934 937 941 944. Request was from "Juanma Barranquero" <lekktu <at> gmail.com> to control <at> emacsbugs.donarmstrong.com. (Tue, 09 Sep 2008 14:50:07 GMT) Full text and rfc822 format available.
bug archived. Request was from Debbugs Internal Request <don <at> donarmstrong.com> to internal_control <at> emacsbugs.donarmstrong.com. (Wed, 08 Oct 2008 14:24:03 GMT) Full text and rfc822 format available.
This bug report was last modified 16 years and 257 days ago.

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