calculator thinks 12!! = 0

[Joe Wells <jbw@macs.hw.ac.uk>]

Dear Emacs gurus,

To reproduce the problem, type "M-x calculator RET 12 ! !".  You will
see the result "0".

More reasonable behavior would be what calculator does on 171!, which
is return "inf".

Additional strange behavior can be found by calculating 11!!, which
seems to run forever (or at least longer than I had the patience to
wait).

The same poor behaviors can be observed also in Emacs 21.4 with the
"-q" command line option, so this is not a new bug and it does not
appear to depend on my configuration.

Joe

----------------------------------------------------------------------
In GNU Emacs 22.1.1 (i686-pc-linux-gnu, GTK+ Version 2.8.20)
 of 2007-06-27 on artemis
Windowing system distributor `The X.Org Foundation', version 11.0.70000000
configured using `configure  '--prefix=/home/jbw/local2' '--enable-debug' '--disable-nls' '--with-x-toolkit=gtk' 'CFLAGS=-O0 -g3 -ggdb''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: jbw
  value of $LANG: nil
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t