Re: extern array as a pointer

From	Keith Thompson <kst-u@mib.org>
Newsgroups	comp.lang.c
Subject	Re: extern array as a pointer
Date	2016-07-12 09:28 -0700
Organization	None to speak of
Message-ID	<lnfureizw5.fsf@kst-u.example.com> (permalink)
References	<27db6ff2-216f-41c6-a9e0-c06d206f5262@googlegroups.com> <nm2ho6$455$1@dont-email.me>

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BartC <bc@freeuk.com> writes:
> On 12/07/2016 11:06, sinbad wrote:
>> why does the following program crash at line# 20.
>> Is it even legal to define array as an integer
>> pointer while infact it's original definition is
>> single dimensional array or five elements.
[...]
>>   5 int array[5];
[...]
>>  16 extern int *array;
[...]
>
> You have a normal array in one module which is defined as a pointer to 
> array in another, assuming arr was meant to be array.

No, it's declared (not defined) as a pointer to int, not a pointer to an
array.  A pointer to an array would be something like
    extern int (*a)[];
or
    extern int (*a)[5];

>                                                       Try writing:
>
> extern int array[];

Yup.

-- 
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"

Thread

extern array as a pointer sinbad <sinbad.sinbad@gmail.com> - 2016-07-12 03:06 -0700
  Re: extern array as a pointer BartC <bc@freeuk.com> - 2016-07-12 11:45 +0100
    Re: extern array as a pointer Frank Tetzel <s1445051@mail.zih.tu-dresden.de> - 2016-07-12 13:58 +0200
      Re: extern array as a pointer Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-12 13:33 +0100
      Re: extern array as a pointer Keith Thompson <kst-u@mib.org> - 2016-07-12 09:30 -0700
        Re: extern array as a pointer James Kuyper <jameskuyper@verizon.net> - 2016-07-12 12:52 -0400
          Re: extern array as a pointer Keith Thompson <kst-u@mib.org> - 2016-07-12 11:30 -0700
            Re: extern array as a pointer supercat@casperkitty.com - 2016-07-12 11:51 -0700
        Re: extern array as a pointer supercat@casperkitty.com - 2016-07-12 10:55 -0700
    Re: extern array as a pointer Keith Thompson <kst-u@mib.org> - 2016-07-12 09:28 -0700
  Re: extern array as a pointer Nobody <nobody@nowhere.invalid> - 2016-07-12 13:26 +0100
    Re: extern array as a pointer Keith Thompson <kst-u@mib.org> - 2016-07-12 09:26 -0700
  Re: extern array as a pointer Richard Heathfield <rjh@cpax.org.uk> - 2016-07-12 13:46 +0100
  Re: extern array as a pointer James Kuyper <jameskuyper@verizon.net> - 2016-07-12 12:33 -0400

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