* Strange division using mixed integers and floats
@ 2004-04-26 15:02 Johan Bockgård
2004-04-27 15:46 ` Kevin Rodgers
0 siblings, 1 reply; 2+ messages in thread
From: Johan Bockgård @ 2004-04-26 15:02 UTC (permalink / raw)
This bug report will be sent to the Free Software Foundation,
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In GNU Emacs 21.2.1 (sparc-sun-solaris2.8, X toolkit)
of 2002-09-24 on nob.dd.chalmers.se
configured using `configure --x-includes=/opt/pd/include/ --x-libraries=/opt/pd/lib --prefix=/rec/emacs-21.2/'
Important settings:
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: iso_8859_1
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: nil
locale-coding-system: iso-latin-1
default-enable-multibyte-characters: t
Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:
Ok, I know why this happens:
(/ 5 4) => 1
But this behaviour is *highly* confusing:
(/ 5 4 2.3) => 0.4347826086956522
Cf. (/ 5 4.0 2.3) => 0.5434782608695653
At least there should be a warning in the manual.
Recent input:
C ESC O C ESC O C ESC O C ESC O C ESC O C ESC O D q
ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC
O B ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B
ESC O B ESC O B ESC O B C-l ESC O A ESC O A ESC O A
C-x b C-g ESC O A ESC O B ESC O B ESC x r e p o r t
TAB RET
Recent messages:
Region saved
-1
0
0.0
Entering debugger...
[2 times]
Back to top level.
Mark set
iswitchb-read-buffer: Quit
Loading emacsbug...done
--
Johan Bockgård
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Strange division using mixed integers and floats
2004-04-26 15:02 Strange division using mixed integers and floats Johan Bockgård
@ 2004-04-27 15:46 ` Kevin Rodgers
0 siblings, 0 replies; 2+ messages in thread
From: Kevin Rodgers @ 2004-04-27 15:46 UTC (permalink / raw)
Johan Bockga*rd wrote:
> Ok, I know why this happens:
>
> (/ 5 4) => 1
>
> But this behaviour is *highly* confusing:
>
> (/ 5 4 2.3) => 0.4347826086956522
>
> Cf. (/ 5 4.0 2.3) => 0.5434782608695653
>
> At least there should be a warning in the manual.
*** elisp-manual-21-2.8/numbers.texi.orig Sat Sep 8 11:42:52 2001
--- elisp-manual-21-2.8/numbers.texi Tue Apr 27 09:45:26 2004
***************
*** 541,547 ****
divides @var{dividend} by each divisor in turn. Each argument may be a
number or a marker.
! If all the arguments are integers, then the result is an integer too.
This means the result has to be rounded. On most machines, the result
is rounded towards zero after each division, but some machines may round
differently with negative arguments. This is because the Lisp function
--- 541,548 ----
divides @var{dividend} by each divisor in turn. Each argument may be a
number or a marker.
! If both of the arguments are integers, then the result---the
! intermediate result, if there are additional arguments---is an integer too.
This means the result has to be rounded. On most machines, the result
is rounded towards zero after each division, but some machines may round
differently with negative arguments. This is because the Lisp function
--
Kevin Rodgers
^ permalink raw reply [flat|nested] 2+ messages in thread
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