Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]);

From	BartC <bc@freeuk.com>
Newsgroups	comp.lang.c
Subject	Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]);
Date	2016-12-30 17:31 +0000
Organization	A noiseless patient Spider
Message-ID	<o465j7$f80$1@dont-email.me> (permalink)
References	(3 earlier) <87y3yxinjl.fsf@bsb.me.uk> <o45mdq$j5p$1@dont-email.me> <871swpiiu8.fsf@bsb.me.uk> <o460jn$pho$1@dont-email.me> <ln60m1z7xc.fsf@kst-u.example.com>

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On 30/12/2016 16:41, Keith Thompson wrote:
> BartC <bc@freeuk.com> writes:
>> On 30/12/2016 14:37, Ben Bacarisse wrote:
>>> BartC <bc@freeuk.com> writes:
>>
>>>> Has anyone ever complained that they can't do 'offset-P'?
>>>
>>> Subtraction is never commutative.  It's a red-herring.
>>
>> That doesn't matter, and not my point.
>>
>> With addition A+B and B+A are both allowed for all types that allow +.
>>
>> With subtraction, A-B and B-A are also both allowed for all types that
>> allow -, *except* when one is a pointer and the other a number.
>>
>> That is the discrepancy.
>
> Which exists because there is no unary "-" for pointers, and negating a
> pointer makes no sense.

Neither does negating an unsigned int.

-- 
Bartc

Thread

How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Veek M <vek.m1234@gmail.com> - 2016-12-30 11:35 +0530
  Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Veek M <vek.m1234@gmail.com> - 2016-12-30 11:39 +0530
    Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Barry Schwarz <schwarzb@dqel.com> - 2016-12-29 22:24 -0800
      Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); raltbos@xs4all.nl (Richard Bos) - 2017-01-01 10:56 +0000
        Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-02 02:40 -0800
          Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); raltbos@xs4all.nl (Richard Bos) - 2017-01-03 21:09 +0000
            Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-13 16:30 -0800
  Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Keith Thompson <kst-u@mib.org> - 2016-12-29 23:35 -0800
  Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); jt@toerring.de (Jens Thoms Toerring) - 2016-12-30 09:59 +0000
    Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2016-12-30 10:43 +0000
      Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-30 12:55 +0000
        Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2016-12-30 13:12 +0000
          Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-30 14:37 +0000
            Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2016-12-30 16:06 +0000
              Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Keith Thompson <kst-u@mib.org> - 2016-12-30 08:41 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2016-12-30 17:31 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-30 19:20 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2016-12-30 19:41 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2016-12-30 12:46 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-31 00:31 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2016-12-30 11:50 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); raltbos@xs4all.nl (Richard Bos) - 2017-01-01 10:54 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-01 11:35 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-01 12:00 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-01 12:16 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-01 13:03 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-01 14:52 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-01 15:42 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-01 16:14 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-01 17:18 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Keith Thompson <kst-u@mib.org> - 2017-01-01 13:09 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-01 19:24 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); bart4858@gmail.com - 2017-01-01 11:24 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-01 20:05 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Keith Thompson <kst-u@mib.org> - 2017-01-01 13:11 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-01 22:25 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-02 02:00 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-01 13:51 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-01 21:59 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-01 14:34 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-02 02:09 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-02 05:44 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-02 15:18 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-02 15:21 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-02 17:07 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-02 09:53 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-02 23:37 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-02 15:07 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ian Collins <ian-news@hotmail.com> - 2017-01-03 12:11 +1300
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-02 15:46 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-03 00:54 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-03 00:33 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-03 11:11 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-03 11:32 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-03 14:05 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-03 14:23 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-03 16:04 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-03 16:09 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-03 17:23 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2017-01-03 09:00 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-03 20:33 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); luser droog <luser.droog@gmail.com> - 2017-01-03 11:40 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2017-01-03 12:23 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); luser droog <luser.droog@gmail.com> - 2017-01-03 12:39 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2017-01-03 13:51 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-15 22:58 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2017-01-16 10:24 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-31 08:36 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-14 00:53 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ian Collins <ian-news@hotmail.com> - 2017-01-03 13:13 +1300
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Keith Thompson <kst-u@mib.org> - 2017-01-02 15:51 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-03 00:51 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); jt@toerring.de (Jens Thoms Toerring) - 2017-01-02 23:32 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-02 23:46 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-03 01:00 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-03 00:42 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ian Collins <ian-news@hotmail.com> - 2017-01-03 21:47 +1300
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-03 01:31 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-03 10:34 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-03 11:19 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-03 16:19 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Thompson <dave.thompson2@verizon.net> - 2017-01-18 07:51 -0500
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Gareth Owen <gwowen@gmail.com> - 2017-01-18 21:30 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Richard Heathfield <rjh@cpax.org.uk> - 2017-01-18 21:45 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); raltbos@xs4all.nl (Richard Bos) - 2017-01-18 21:55 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Gareth Owen <gwowen@gmail.com> - 2017-01-19 22:25 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-02 00:08 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-02 02:05 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Malcolm McLean <malcolm.mclean5@btinternet.com> - 2017-01-01 09:45 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-01 19:20 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2017-01-01 15:26 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2017-01-01 23:48 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-02 00:25 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2017-01-01 16:44 +0100
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Philip Lantz <prl@canterey.us> - 2017-01-01 23:54 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Keith Thompson <kst-u@mib.org> - 2017-01-01 13:25 -0800
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-01-01 22:36 +0000
                Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2017-01-01 15:38 -0800
        Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); BartC <bc@freeuk.com> - 2016-12-30 13:42 +0000
          Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); David Brown <david.brown@hesbynett.no> - 2016-12-30 15:07 +0100
    Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); supercat@casperkitty.com - 2016-12-30 10:21 -0800
  Re: How is he doing: int a[2] = { 1, 2 }; printf("%d\n", 2[a]); Veek M <vek.m1234@gmail.com> - 2016-12-31 07:37 +0530

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