Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.c > #151829
| Newsgroups | comp.lang.c |
|---|---|
| Date | 2020-04-30 06:13 -0700 |
| References | <a844dd76-5343-4845-a9d2-1d05d042baa0@googlegroups.com> <r8eebl$ru0$1@news.albasani.net> <9bf151f2-e3f8-488b-bf10-9ba136d23a4f@googlegroups.com> <DZzqG.217998$dx4.55655@fx05.am4> |
| Message-ID | <f4fc690a-e6ff-481e-87ef-115db71652d7@googlegroups.com> (permalink) |
| Subject | Re: longer 'char literals' meaning in c |
| From | fir <profesor.fir@gmail.com> |
W dniu czwartek, 30 kwietnia 2020 15:00:29 UTC+2 użytkownik Bart napisał:
> On 30/04/2020 13:17, fir wrote:
> > W dniu czwartek, 30 kwietnia 2020 13:55:42 UTC+2 użytkownik Bonita Montero napisał:
> >> Am 30.04.2020 um 13:43 schrieb fir:
> >>> by char literal i name things like 'a' '2'
> >>> (libe by string literal i name "aaa" "2")
> >>>
> >>> the wuestion is does have those longer char literals like 'aaaaaaaa' some defined meaning
> >>> in c? (mostly thinking on older C like c89)
> >>
> >> Multibyte character-literals are mapped to an int and have a implemen-
> >> tation-defined mapping according to the byte-ordering of the machine.
> >
> > implementation defined?
> > is for example '%$' value implementation defined?
> > % is 0x25, $ is 0x24
> >
> > shouldnt it be 0x2524 anywhere?
> >
>
> Take this:
>
> #include <stdio.h>
> int main(void) {
> printf("%08X\n",'ABCD');
> }
>
> Some compilers will brint 41424344, and others will show 44434241, even
> on the same little-endian machine.
>
> So it is implementation-defined, meaning you can't rely on it being a
> particular way around unless you specify a certain compiler always to be
> used.
>
> C with 32-bit ints also limit the length to 4 characters.
>
> Those compilers showing 41424344 (most of them), will be using a layout
> in memory which is the reverse to that used for the string "ABCD", which
> is 44434241.
>
> (My C compiler, as well as Tcc, uses a memory layout for 'ABCD' that
> matches that of a string "ABCD". So the 'A' in 'ABCD' is the lowest
> addressed when stored in memory, and the least significant byte of the
> int (for little-endian).
>
> My static language does the same, but also allows character constants of
> 64 bits and 128 bits, ie. up to 'ABCDEFGHIJKLMNOP'.)
i dont get it
logically if you rethink it (as i quickly did a minutes before) the proper mapping is simple
'ABCD' == 0x41424344
why dat? becouse 'D' is for sure 0x44
'CD' should be (also for sure) 0x4344
(becouse you shoulnt reverse digits in number as in common world the older is on left
it should have nothing as to big or little endians, in memory it should be simply stored as a number (say int number or short or long numbers depending hov compiler wona store it) according to opresent endian, but as numerical value it is clear and shouldnt make
various implementations
are you sure that theer are compilers who put it wrong? my gcc put it correctly
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar
longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 04:43 -0700
Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 13:55 +0200
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:17 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:22 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:24 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:29 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 06:16 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 05:44 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 14:00 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 06:13 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 14:41 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 07:18 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 07:31 -0700
Re: longer 'char literals' meaning in c Spiros Bousbouras <spibou@gmail.com> - 2020-04-30 15:49 +0000
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 09:12 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 15:49 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 08:31 -0700
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 14:00 -0700
Re: longer 'char literals' meaning in c Spiros Bousbouras <spibou@gmail.com> - 2020-04-30 21:16 +0000
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 15:22 -0700
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-04-30 18:36 -0400
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 22:25 +0100
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 15:30 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 00:01 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 16:15 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 16:29 -0700
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 17:15 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 01:47 +0100
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-04-30 18:38 -0700
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-04-30 18:55 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 11:35 +0100
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-01 05:47 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-05-01 06:15 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 15:53 +0100
Re: longer 'char literals' meaning in c Richard Damon <Richard@Damon-Family.org> - 2020-05-01 12:38 -0400
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-01 09:57 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-05-01 20:50 +0100
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-01 13:11 -0700
Re: longer 'char literals' meaning in c jameskuyper@stellarscience.com - 2020-05-01 12:05 -0700
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-01 19:08 -0400
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-01 09:51 -0700
Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-02 15:22 +0200
Re: longer 'char literals' meaning in c Richard Damon <Richard@Damon-Family.org> - 2020-05-02 12:13 -0400
Re: longer 'char literals' meaning in c Les Cargill <lcargill99@comcast.com> - 2020-05-04 00:17 -0500
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 10:51 -0400
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 10:23 -0400
Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-04 16:48 +0200
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 12:39 -0400
Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-04 19:37 +0200
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 15:03 -0400
Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-05 08:33 +0200
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-05 09:47 -0400
Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-05-05 16:22 +0200
Re: longer 'char literals' meaning in c Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-04 10:27 -0700
Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-05 00:47 +0000
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-04 20:08 -0700
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-04 23:52 -0400
Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-05 17:10 +0000
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-05 13:41 -0700
Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-05 22:29 +0000
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-05 16:18 -0700
Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-06 02:33 +0000
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-05 20:06 -0700
Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-06 18:57 +0000
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-06 13:37 -0700
Re: longer 'char literals' meaning in c Spiros Bousbouras <spibou@gmail.com> - 2020-05-07 13:48 +0000
Re: longer 'char literals' meaning in c Spiros Bousbouras <spibou@gmail.com> - 2020-05-07 13:58 +0000
Re: longer 'char literals' meaning in c Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-07 18:01 -0700
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-05 20:18 -0400
Re: longer 'char literals' meaning in c antispam@math.uni.wroc.pl - 2020-05-06 20:01 +0000
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-06 18:20 -0400
Re: longer 'char literals' meaning in c Siri Cruise <chine.bleu@yahoo.com> - 2020-04-30 20:13 -0700
Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 16:58 +0200
Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 16:59 +0200
Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 17:14 +0200
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 08:33 -0700
Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 18:15 +0200
Re: longer 'char literals' meaning in c James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-04-30 08:33 -0700
Re: longer 'char literals' meaning in c David Brown <david.brown@hesbynett.no> - 2020-04-30 17:49 +0200
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 17:23 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 09:38 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 17:56 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 10:04 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 18:28 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 10:39 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 19:16 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:24 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 19:58 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 12:08 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 20:16 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 12:29 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 12:10 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:17 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 10:31 -0700
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 19:20 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:28 -0700
Re: longer 'char literals' meaning in c Richard Damon <Richard@Damon-Family.org> - 2020-04-30 13:48 -0400
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 09:01 -0700
Re: longer 'char literals' meaning in c Vir Campestris <vir.campestris@invalid.invalid> - 2020-04-30 21:32 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 13:43 -0700
Re: longer 'char literals' meaning in c Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-04-30 16:54 -0400
Re: longer 'char literals' meaning in c Vir Campestris <vir.campestris@invalid.invalid> - 2020-05-03 21:23 +0100
Re: longer 'char literals' meaning in c Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2020-05-03 16:48 -0400
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:38 -0700
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 11:57 -0700
Re: longer 'char literals' meaning in c Bonita Montero <Bonita.Montero@gmail.com> - 2020-04-30 21:01 +0200
Re: longer 'char literals' meaning in c Bart <bc@freeuk.com> - 2020-04-30 20:07 +0100
Re: longer 'char literals' meaning in c fir <profesor.fir@gmail.com> - 2020-04-30 12:41 -0700
Re: longer 'char literals' meaning in c Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-04 10:30 -0700
csiph-web