From: "josephoswald+gg@gmail.com" <josephoswald@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: How do I convert hex numbers to decimal ?
Date: Mon, 5 Oct 2009 00:05:24 -0700 (PDT) [thread overview]
Message-ID: <c60ec3ec-c303-4031-a2bd-432a064c28e7@q14g2000vbi.googlegroups.com> (raw)
In-Reply-To: 1bfadfca-66ba-4aec-bb90-eb3a460c660c@l13g2000yqb.googlegroups.com
On Sep 6, 9:03 pm, bolega <gnuist...@gmail.com> wrote:
> I have a bunch of related questions, but the solution is desired in
> emacs lisp and to work inside emacs only.
>
> 1) How do I convert hex numbers to decimal ?
> 2) How do I convert ascii to the character that it represents, short
> of a table ? Any function or simpler algorithm ?
> 3) What are the variables and how to set their values ?
>
> read-quoted-char-radix
> quoted-char-radix
>
> 4) How do i find the emacs lisp code for C-x = to see how it gives the
> ascii of the char at the cursor and then use to find the reverse, ie
> ascii to char ?
>
> Thanks a lot to the star who can explain.
Emacs Lisp has
(string-to-number string &optional base)
Parse string as a decimal number and return the number.
This parses both integers and floating point numbers.
It ignores leading spaces and tabs.
If base, interpret string as a number in that base. If base
isn't
present, base 10 is used. base must be between 2 and 16
(inclusive).
If the base used is not 10, floating point is not recognized.
I found this in the Elisp Info documentation under String Conversion.
In your case you want to use (string-to-number "f00" 16)
prev parent reply other threads:[~2009-10-05 7:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-07 1:03 How do I convert hex numbers to decimal ? bolega
2009-09-07 1:11 ` Janis Papanagnou
2009-09-07 14:44 ` Wang Lei
2009-09-07 2:56 ` Eli Zaretskii
[not found] ` <mailman.6147.1252292305.2239.help-gnu-emacs@gnu.org>
2009-09-07 5:52 ` bolega
2009-09-07 6:38 ` Teemu Likonen
2009-09-07 7:12 ` Pascal J. Bourguignon
2009-10-05 7:05 ` josephoswald+gg@gmail.com [this message]
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