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(message "%s" (+ 379.744 57.93))
The above prints 437.67400000000004. Same if I use 57.930, but if I use 57.931 (below) I get the correct answer 437.675.
(message "%s" (+ 379.744 57.931))
I was able to work around by using format:
(message "%s" (format "%f" (+ 379.744 57.93)))
which prints 437.674000.
FYI, I can replicate the issue with Emacs 21.3.1.
Thanks,
-Kevin
In GNU Emacs 24.4.1 (x86_64-unknown-cygwin)
of 2014-10-21 on desktop-new
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
`configure
--srcdir=/home/kbrown/src/cygemacs/emacs-24.4-1.x86_64/src/emacs-24.4
--prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
--libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var
--sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share
--docdir=/usr/share/doc/emacs --htmldir=/usr/share/doc/emacs/html -C
--with-w32 --without-file-notification --enable-checking 'CFLAGS=-ggdb
-O2 -pipe -Wimplicit-function-declaration -Og -g3
-fdebug-prefix-map=/home/kbrown/src/cygemacs/emacs-24.4-1.x86_64/build=/usr/src/debug/emacs-24.4-1
-fdebug-prefix-map=/home/kbrown/src/cygemacs/emacs-24.4-1.x86_64/src/emacs-24.4=/usr/src/debug/emacs-24.4-1'
CPPFLAGS= LDFLAGS='
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Fundamental
Minor modes in effect:
shell-dirtrack-mode: t
display-time-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
line-number-mode: t
Recent messages:
Load-path shadows:
None found.
Features:
(pp shadow sort gnus-util mail-extr emacsbug message format-spec rfc822
mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils info find-func grep tabify sh-script smie
executable shell pcomplete compile comint ansi-color ring dabbrev
cc-langs cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align
cc-engine cc-vars cc-defs arc-mode archive-mode dired-aux ispell apropos
dired help-fns help-mode easymenu mule-util server edmacro kmacro
cl-loaddefs cl-lib time jka-compr time-date tooltip electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel w32-common-fns disp-table
w32-win w32-vars tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment lisp-mode prog-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind w32 multi-tty emacs)
Memory information:
((conses 16 145217 10616)
(symbols 48 23227 0)
(miscs 40 133 446)
(strings 32 31064 5702)
(string-bytes 1 930985)
(vectors 16 15771)
(vector-slots 8 452262 7494)
(floats 8 82 775)
(intervals 56 640 31)
(buffers 960 24))
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