unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
From: Van Ly via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Stephen Berman <stephen.berman@gmx.net>
Cc: 64441@debbugs.gnu.org
Subject: bug#64441: 29.0.92; elisp arithmetic error at ielm prompt
Date: Tue, 4 Jul 2023 10:44:06 GMT	[thread overview]
Message-ID: <202307041044.364Ai6nN021477@sdf.org> (raw)
In-Reply-To: <878rbx547h.fsf@gmx.net> (message from Stephen Berman on Mon, 03 Jul 2023 18:50:58 +0200)


> From: Stephen Berman
>
> `/' in Elisp is different from `/' in Common Lisp.
> 
> (elisp) Arithmetic Operations:
> 
>   If all the arguments are integers, the result is an integer,
>   obtained by rounding the quotient towards zero after each division.
> 
> Hence (/ 3 4), (/ 7 13) and (/ 5 12) all evaluate to 0, and "If you
> divide an integer by the integer 0, Emacs signals an ‘arith-error’
> error".
> 
> But in Common Lisp
> (http://www.lispworks.com/documentation/HyperSpec/Body/f_sl.htm):
> 
>   If each argument is either an integer or a ratio, and the result is
>   not an integer, then it is a ratio.
> 
> Hence (/ 3 4) => 3/4,  (/ 7 13) => 7/13 and (/ 5 12) => 5/12
> 

Thank you Steve.











  reply	other threads:[~2023-07-04 10:44 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-03 16:20 bug#64441: 29.0.92; elisp arithmetic error at ielm prompt Van Ly via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-07-03 16:50 ` Stephen Berman
2023-07-04 10:44   ` Van Ly via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2023-07-03 16:53 ` Eli Zaretskii
2023-09-08 16:20   ` Stefan Kangas

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=202307041044.364Ai6nN021477@sdf.org \
    --to=bug-gnu-emacs@gnu.org \
    --cc=64441@debbugs.gnu.org \
    --cc=stephen.berman@gmx.net \
    --cc=van.ly@sdf.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).