From: Paul Eggert <eggert@cs.ucla.edu>
To: Helmut Eller <eller.helmut@gmail.com>
Cc: 32252@debbugs.gnu.org
Subject: bug#32252: [PATCH] %o and %x now format signed numbers
Date: Thu, 26 Jul 2018 00:59:56 -0700 [thread overview]
Message-ID: <1c3c61c4-f93f-3bea-f6ed-b89e1cdea89b@cs.ucla.edu> (raw)
In-Reply-To: <m21sbr3ipa.fsf@gmail.com>
Helmut Eller wrote:
> What's more interesting:
> (format "%x" (lognot 8)) => "-9"
> or
> (format "%x" (lognot 8)) => "3ffffffffffffff7"
>
> For me, the first version is totally useless.
Shrug. It's what Common Lisp and Scheme do, and it works pretty well once you
get used to it. Programs that need negative integers displayed modulo some power
of 2 can use the mod or logand functions; that's the mathematically right way to
do it anyway, and it's machine-independent.
> Of course there have been proposals: Do your bignum stuff with a
> different format specifier.
And prohibit %x on bignums? That would make little sense. Common Lisp and Scheme
don't have any such prohibition; why should Emacs Lisp? Again, programs that
need just the low-order bits of a negative integer can use 'mod' or a mask.
> Here is another proposal: Add a read syntax for unsigned fixnums like
> #x3fffffffffffffffu or alternatively #xu3fffffffffffffff.
That's heading down the wrong path. Emacs Lisp does not have unsigned fixnums,
so why add a syntax for a data type that does not exist? And Emacs Lisp should
not add such a data type, as it is a low-level machine concept unsuitable for
Lisp, is not needed in Emacs Lisp, and would cause unnecessary complexity in
documentation and implementation.
next prev parent reply other threads:[~2018-07-26 7:59 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-23 19:12 bug#32252: [PATCH] %o and %x now format signed numbers Paul Eggert
2018-07-23 19:48 ` Helmut Eller
2018-07-23 19:49 ` Drew Adams
2018-07-23 23:30 ` Paul Eggert
2018-07-24 1:20 ` Drew Adams
2018-07-24 2:04 ` Paul Eggert
2018-07-24 2:38 ` Eli Zaretskii
2018-07-24 2:44 ` Paul Eggert
2018-07-24 14:29 ` Eli Zaretskii
2018-07-24 4:15 ` Drew Adams
2018-07-23 23:39 ` Paul Eggert
2018-07-24 1:16 ` Drew Adams
2018-07-25 3:53 ` Richard Stallman
2018-07-25 21:56 ` Drew Adams
2018-07-27 3:20 ` Richard Stallman
2018-07-24 4:49 ` Helmut Eller
2018-07-24 14:22 ` Paul Eggert
2018-07-24 14:35 ` Andreas Schwab
2018-07-24 18:15 ` Helmut Eller
2018-07-25 0:50 ` Paul Eggert
2018-07-25 2:41 ` Eli Zaretskii
2018-07-25 17:21 ` Paul Eggert
2018-07-25 17:28 ` Eli Zaretskii
2018-07-26 7:44 ` Paul Eggert
2018-07-26 8:04 ` Helmut Eller
2018-07-26 8:16 ` Paul Eggert
2018-07-25 6:58 ` Helmut Eller
2018-07-26 7:59 ` Paul Eggert [this message]
2018-07-26 8:43 ` Helmut Eller
2018-07-26 9:15 ` Paul Eggert
2018-07-26 9:39 ` Helmut Eller
2018-07-26 9:31 ` Andreas Schwab
2018-07-26 9:40 ` Robert Pluim
2018-07-26 9:56 ` Helmut Eller
2018-07-26 16:55 ` Paul Eggert
2018-07-26 17:16 ` Helmut Eller
2018-07-26 17:50 ` Paul Eggert
2018-07-26 18:35 ` Helmut Eller
2018-07-26 21:07 ` Paul Eggert
2018-07-24 18:27 ` Eli Zaretskii
2018-07-25 0:54 ` Paul Eggert
2018-07-25 8:09 ` Andreas Schwab
2018-07-25 20:16 ` Paul Eggert
2018-07-25 14:17 ` Eli Zaretskii
2018-07-25 23:33 ` Brett Gilio
2018-07-26 7:26 ` Paul Eggert
2018-07-24 16:26 ` Andy Moreton
2018-07-25 10:08 ` Andy Moreton
2018-07-26 12:52 ` Andy Moreton
2018-07-26 12:54 ` Andy Moreton
2018-07-26 17:18 ` Helmut Eller
2018-08-23 9:37 ` Helmut Eller
2022-07-04 1:03 ` bug#32252: i find binary-as-unsigned to be very helpful snickerbockers
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=1c3c61c4-f93f-3bea-f6ed-b89e1cdea89b@cs.ucla.edu \
--to=eggert@cs.ucla.edu \
--cc=32252@debbugs.gnu.org \
--cc=eller.helmut@gmail.com \
/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).