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Re: Octal

Path csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Octal
Date Tue, 27 Dec 2016 16:38:38 -0800
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supercat@casperkitty.com writes:
> On Tuesday, December 27, 2016 at 2:44:15 PM UTC-6, Keith Thompson wrote:
>> supercat writes:
>> You've shown one case of someone running into the issue.  In that one
>> case, did adding spaces actually cause line width problems, or is that
>> just a theoretical issue?  (If so, prepending "1+" rather than appending
>> "+1" would have been a workaround.  Taking the time to modify the
>> constants, perhaps using a script, might have been even better.)
>
> I don't know that adding spaces would have caused line-width problems in
> that particular case, but I've certainly had other cases where a need to
> add extra spaces to tables would cause line-width issues.
>
>> > A simple way to address the issue would be to say that compilers may at
>> > their option process 0x1E+1 as three tokens 0x1E + 1, or may issue a
>> > diagnostic.  There are already many situations where some compilers will
>> > silently accept code for which others would issue a diagnostic (e.g.
>> >
>> >     int q[256u*256u];
>> 
>> 256u*256u clearly doesn't require a diagnostic.  Compilers are permitted
>> to warn about anything they like.
>
> What is the value of 256u*256u on systems where UINT_MAX is 65535?  Why
> would a diagnostic not be required on all such systems?

The value of 256u*256u on such a system is 0u.  A diagnostic is required
because a zero-length array is a constraint violation.  A diagnostic is
not required on systems with UINT_MAX > 65535 because on such systems no
constraint is violated.  This is irrelevant to the topic of this thread.
Start a new thread and I might consider discussing it further.

[...]

>> Ok, so let's say the standard is updated to say that a conforming
>> compiler may, but need not, treat 0x1E+1 as three tokens --
>> and if it does so it needn't warn about it.  You happen to use
>> that construct in your code, without being aware of the issue.
>> Years later you port the code to another compiler that rejects it.
>> But hey, at least you were *temporarily* able to save two whole
>> columns in one line of your C source file.
>
> I would expect that compilers would quickly evolve to accept the new syntax
> without complaint if allowed to do so.  Perhaps there's some non-contrived
> way of writing a scanner where it's easier to regard "E+" and "E-" as special
> within any number, than to regard an "E" as special only when processing a
> decimal literal, but I would think using single-character look-ahead would
> be easier than using multi-character.
>
> Is there some reason you think compiler writers would want to stick with
> extra complexity whose primary purpose is to produce syntax errors from code
> which would otherwise be unambiguous, rather than remove the weird cases
> from their scanner and replace them with something simpler?

What "extra complexity"?  Have you read section 6.4.8 of the standard,
describing preprocessing numbers?

Again, suppose such a change is made.  How long do you think it would
take before C programmers can reliably assume that 0x1E+1 will *always*
be treated as 3 tokens?

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Octal BartC <bc@freeuk.com> - 2016-12-27 14:08 +0000
  Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-27 06:19 -0800
    Re: Octal BartC <bc@freeuk.com> - 2016-12-27 14:58 +0000
      Re: Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-27 07:07 -0800
        Re: Octal BartC <bc@freeuk.com> - 2016-12-27 15:22 +0000
          Re: Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-27 07:37 -0800
            Re: Octal BartC <bc@freeuk.com> - 2016-12-27 16:24 +0000
              Re: Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-27 08:30 -0800
              Re: Octal supercat@casperkitty.com - 2016-12-27 09:10 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 09:35 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-27 10:47 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 12:03 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-27 12:27 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 12:44 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-27 13:37 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 16:38 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-27 17:53 -0800
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-27 20:26 -0600
                Re: Octal supercat@casperkitty.com - 2016-12-27 18:48 -0800
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-27 22:20 -0600
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 18:41 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-27 19:19 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-29 14:52 +1300
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 18:41 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-28 16:54 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-27 17:44 +0000
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 12:17 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-27 22:39 +0000
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-28 11:49 +1300
                Re: Octal BartC <bc@freeuk.com> - 2016-12-27 23:09 +0000
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-28 12:32 +1300
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 00:51 +0000
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-28 14:00 +1300
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 01:13 +0000
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-27 20:04 -0600
                Re: Octal supercat@casperkitty.com - 2016-12-27 18:45 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-29 13:35 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-29 14:49 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-29 15:33 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-30 12:35 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-13 15:19 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2017-01-13 15:32 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2017-01-14 12:35 +1300
                Re: Octal Keith Thompson <kst-u@mib.org> - 2017-01-13 15:51 -0800
                Re: Octal supercat@casperkitty.com - 2017-01-13 18:25 -0800
                Re: Octal Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-14 06:21 -0800
                Re: Octal supercat@casperkitty.com - 2017-01-14 14:00 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-15 23:08 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-15 23:02 -0800
                Re: Octal supercat@casperkitty.com - 2017-01-13 18:52 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-15 23:46 -0800
                Re: Octal supercat@casperkitty.com - 2017-01-16 01:46 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-31 08:33 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 17:19 -0800
                Re: Octal raltbos@xs4all.nl (Richard Bos) - 2016-12-28 09:39 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 11:02 +0000
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-28 12:13 +0100
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 11:41 +0000
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 09:31 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 17:39 +0000
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-28 22:05 +0100
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 12:01 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 20:05 +0000
                Re: Octal asetofsymbols@gmail.com - 2016-12-28 11:20 -0800
                Re: Octal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-28 12:01 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 12:30 +0000
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-28 13:51 +0100
                Re: Octal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-28 16:26 +0000
                Re: Octal supercat@casperkitty.com - 2016-12-28 08:40 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 09:41 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 18:04 +0000
                Re: Octal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-28 19:36 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 19:42 +0000
                Re: Octal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-29 00:34 +0000
                Re: Octal supercat@casperkitty.com - 2016-12-28 11:04 -0800
                Re: Octal raltbos@xs4all.nl (Richard Bos) - 2016-12-28 12:09 +0000
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 16:46 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 00:56 +0000
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 17:52 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 11:27 +0000
                Re: Octal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-28 12:09 +0000
                Re: Octal supercat@casperkitty.com - 2016-12-28 08:17 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 17:02 +0000
                Re: Octal Ike Naar <ike@iceland.freeshell.org> - 2016-12-28 17:25 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 17:45 +0000
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 10:21 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-28 09:27 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 10:23 -0800
                Re: Octal supercat@casperkitty.com - 2016-12-28 11:18 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 10:19 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-29 15:54 +0000
                Re: Octal Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-29 12:57 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-30 10:01 +1300
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-30 10:44 +0100
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-29 17:32 +0100
                Re: Octal BartC <bc@freeuk.com> - 2016-12-29 17:03 +0000
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-29 16:26 -0600
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-30 11:31 +1300
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-29 16:58 -0600
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-30 11:59 +1300
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-30 09:00 +1300
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-30 10:21 +0100
                Re: Octal asetofsymbols@gmail.com - 2016-12-30 01:29 -0800
                Re: Octal asetofsymbols@gmail.com - 2016-12-30 01:29 -0800
                Re: Octal asetofsymbols@gmail.com - 2016-12-30 01:36 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-29 11:52 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-29 17:10 +0000
                Re: Octal supercat@casperkitty.com - 2016-12-29 05:52 -0800
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-28 19:51 -0600
                Re: Octal BartC <bc@freeuk.com> - 2016-12-29 21:09 +0000
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-30 10:15 +1300
                Re: Octal Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-29 13:53 -0800
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-30 12:07 +0100
                Re: Octal BartC <bc@freeuk.com> - 2016-12-30 13:04 +0000
                Re: Octal Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-30 05:31 -0800
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-30 15:00 +0100
                Re: Octal BartC <bc@freeuk.com> - 2016-12-30 15:55 +0000
                Re: Octal David Brown <david.brown@hesbynett.no> - 2017-01-01 16:00 +0100
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2017-01-02 08:33 +1300
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2017-01-02 09:02 +1300
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2017-01-02 09:38 +1300
                Re: Octal Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-01 13:59 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2017-01-01 14:24 -0800
                Re: Octal supercat@casperkitty.com - 2017-01-01 15:51 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2017-01-02 13:09 +1300
                Re: Octal supercat@casperkitty.com - 2017-01-01 16:50 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2017-01-02 14:24 +1300
                Re: Octal David Brown <david.brown@hesbynett.no> - 2017-01-02 01:53 +0100
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2017-01-02 14:15 +1300
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-02 02:28 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-31 06:24 +1300
                Re: Octal BartC <bc@freeuk.com> - 2016-12-30 17:53 +0000
                Re: Octal luser droog <luser.droog@gmail.com> - 2016-12-30 10:01 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-31 09:57 +1300
                Re: Octal supercat@casperkitty.com - 2016-12-30 13:50 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-31 11:09 +1300
                Re: Octal supercat@casperkitty.com - 2016-12-30 14:46 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-31 12:28 +1300
                Re: Octal supercat@casperkitty.com - 2016-12-30 16:01 -0800
                Re: Octal Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-12-30 14:48 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-30 22:51 +0000
                Re: Octal supercat@casperkitty.com - 2016-12-30 15:20 -0800
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-31 12:34 +1300
                Re: Octal BartC <bc@freeuk.com> - 2016-12-30 23:40 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-30 22:12 +0000
                Re: Octal raltbos@xs4all.nl (Richard Bos) - 2016-12-28 21:38 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-29 12:04 +0000
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-29 13:42 +0100
                Re: Octal Ian Collins <ian-news@hotmail.com> - 2016-12-30 08:59 +1300
                Re: Octal supercat@casperkitty.com - 2016-12-29 12:23 -0800
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-30 10:56 +0100
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 22:09 +0000
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-29 12:27 +0100
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 21:18 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 20:46 +0000
                Re: Octal raltbos@xs4all.nl (Richard Bos) - 2016-12-28 20:55 +0000
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-28 14:54 -0600
                Re: Octal BartC <bc@freeuk.com> - 2016-12-29 15:44 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 19:39 +0000
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-28 15:04 -0600
                Re: Octal raltbos@xs4all.nl (Richard Bos) - 2016-12-28 19:52 +0000
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-29 09:36 -0800
                Re: Octal BartC <bc@freeuk.com> - 2016-12-29 18:02 +0000
                Re: Octal BartC <bc@freeuk.com> - 2016-12-30 16:17 +0000
                Re: Octal David Brown <david.brown@hesbynett.no> - 2017-01-01 16:09 +0100
                Re: Octal BartC <bc@freeuk.com> - 2016-12-28 20:02 +0000
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 12:32 -0800
                Re: Octal Richard Heathfield <rjh@cpax.org.uk> - 2016-12-29 13:45 +0000
                Re: Octal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-28 17:16 +0000
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 10:04 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-02 02:26 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2017-01-02 12:35 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-12 23:22 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2017-01-13 10:04 -0800
                Re: Octal Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-14 00:45 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 09:59 -0800
                Re: Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-27 09:45 -0800
        Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-27 17:14 +0100
          Re: Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-27 08:23 -0800
            Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-28 10:37 +0100
              Re: Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-28 03:07 -0800
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-28 12:25 +0100
                Re: Octal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-28 11:58 +0000
                Re: Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-28 04:35 -0800
                Re: Octal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-28 17:31 +0000
                Re: Octal "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2016-12-28 09:38 -0800
                Re: Octal Robert Wessel <robertwessel2@yahoo.com> - 2016-12-28 15:12 -0600
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 12:01 -0800
              Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 09:20 -0800
                Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-28 13:39 -0800
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-29 12:29 +0100
                Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-28 22:20 +0100
      Re: Octal Noob <root@127.0.0.1> - 2016-12-28 13:02 +0100
        Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-28 13:30 +0100
        Re: Octal BartC <bc@freeuk.com> - 2016-12-28 13:25 +0000
  Re: Octal Manfred <noname@invalid.add> - 2016-12-27 15:19 +0100
    Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 08:37 -0800
      Re: Octal Manfred <noname@invalid.add> - 2016-12-27 18:43 +0100
        Re: Octal Keith Thompson <kst-u@mib.org> - 2016-12-27 12:07 -0800
    Re: Octal Manfred <noname@invalid.add> - 2016-12-27 18:21 +0100
  Re: Octal David Brown <david.brown@hesbynett.no> - 2016-12-27 15:28 +0100
  Re: Octal BGB <cr88192@hotmail.com> - 2016-12-27 11:42 -0600

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