* bug#64441: 29.0.92; elisp arithmetic error at ielm prompt
@ 2023-07-03 16:20 Van Ly via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-07-03 16:50 ` Stephen Berman
2023-07-03 16:53 ` Eli Zaretskii
0 siblings, 2 replies; 5+ messages in thread
From: Van Ly via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2023-07-03 16:20 UTC (permalink / raw)
To: 64441
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Hello,
The following calculation errors in elisp.
ELISP> (/ (* (/ 3 4) (/ 7 13)) (/ 5 12))
*** Eval error *** Arithmetic error
The SBCL repl doesn't.
CL-USER> (/ (* (/ 3 4) (/ 7 13)) (/ 5 12))
63/65 (0.9692308, 1260/13%)
Steps to reproduce the error.
1. start using, 'emacs -Q'
2. get to the ielm elisp prompt, 'M-x ielm'
3. enter the above calculation
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In GNU Emacs 29.0.92 (build 1, aarch64-unknown-linux-gnu, GTK+ Version
3.24.24, cairo version 1.16.0) of 2023-06-21 built on x23
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)
Configured using:
'configure --without-pop --without-mailutils'
Configured features:
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LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
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XINPUT2 XPM GTK3 ZLIB
Important settings:
value of $LANG: C.UTF-8
locale-coding-system: utf-8-unix
Major mode: IELM
Minor modes in effect:
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tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
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Load-path shadows:
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emacs)
Memory information:
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^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#64441: 29.0.92; elisp arithmetic error at ielm prompt
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
2023-07-03 16:53 ` Eli Zaretskii
1 sibling, 1 reply; 5+ messages in thread
From: Stephen Berman @ 2023-07-03 16:50 UTC (permalink / raw)
To: 64441; +Cc: van.ly
On Mon, 3 Jul 2023 16:20:34 GMT Van Ly via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> wrote:
> Hello,
>
> The following calculation errors in elisp.
>
> ELISP> (/ (* (/ 3 4) (/ 7 13)) (/ 5 12))
> *** Eval error *** Arithmetic error
>
> The SBCL repl doesn't.
>
> CL-USER> (/ (* (/ 3 4) (/ 7 13)) (/ 5 12))
> 63/65 (0.9692308, 1260/13%)
>
> Steps to reproduce the error.
>
> 1. start using, 'emacs -Q'
> 2. get to the ielm elisp prompt, 'M-x ielm'
> 3. enter the above calculation
`/' 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
Steve Berman
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#64441: 29.0.92; elisp arithmetic error at ielm prompt
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
@ 2023-07-03 16:53 ` Eli Zaretskii
2023-09-08 16:20 ` Stefan Kangas
1 sibling, 1 reply; 5+ messages in thread
From: Eli Zaretskii @ 2023-07-03 16:53 UTC (permalink / raw)
To: Van Ly; +Cc: 64441
> Date: Mon, 3 Jul 2023 16:20:34 GMT
> From: Van Ly via "Bug reports for GNU Emacs,
> the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>
> The following calculation errors in elisp.
>
> ELISP> (/ (* (/ 3 4) (/ 7 13)) (/ 5 12))
> *** Eval error *** Arithmetic error
You are dividing zero by zero.
This is not a bug.
> The SBCL repl doesn't.
Emacs is not SBCL.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#64441: 29.0.92; elisp arithmetic error at ielm prompt
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
0 siblings, 0 replies; 5+ messages in thread
From: Van Ly via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2023-07-04 10:44 UTC (permalink / raw)
To: Stephen Berman; +Cc: 64441
> 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.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#64441: 29.0.92; elisp arithmetic error at ielm prompt
2023-07-03 16:53 ` Eli Zaretskii
@ 2023-09-08 16:20 ` Stefan Kangas
0 siblings, 0 replies; 5+ messages in thread
From: Stefan Kangas @ 2023-09-08 16:20 UTC (permalink / raw)
To: Eli Zaretskii, Van Ly; +Cc: 64441
tags 64441 + notabug
close 64441
thanks
Eli Zaretskii <eliz@gnu.org> writes:
>> ELISP> (/ (* (/ 3 4) (/ 7 13)) (/ 5 12))
>> *** Eval error *** Arithmetic error
>
> You are dividing zero by zero.
>
> This is not a bug.
Yup, so I'm closing it.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2023-09-08 16:20 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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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
2023-07-03 16:53 ` Eli Zaretskii
2023-09-08 16:20 ` Stefan Kangas
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