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NNTP-Posting-Date: Tue, 07 Feb 2017 12:29:35 -0600
From: Gareth Owen <gwowen@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: How to compile several C files
References: <ddcc4bba-8f05-4537-9deb-1d5c759602f5@googlegroups.com> <o7cnp0$esp$1@dont-email.me> <af4dd6a4-bfa9-4865-aebb-ea5e0c9c25e2@googlegroups.com> <137458b9-1471-27ef-8c1e-8d9e781f315f@verizon.net> <lno9yd29wk.fsf@kst-u.example.com>
Date: Tue, 07 Feb 2017 18:29:35 +0000
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Keith Thompson <kst-u@mib.org> writes:

> "James R. Kuyper" <jameskuyper@verizon.net> writes:
> [...]
>> All of the following are object definitions. They do NOT belong in a 
>> header file - you need to move each of these definitions to one or the 
>> other of the *.c files. If an object's name is used in both *.c file, 
>> you should have a declaration for that object in one of the two header 
>> files. But that declaration would look different from from these 
>> definitions. At a minimum, you would put "extern" at the beginning of 
>> each declaration. Also, for the arrays, it's not necessary to put the 
>> actual number of elements in the object declaration, only in the object 
>> definition.
>
> It's not necessary to include the length in the declaration.  For example
> you could have
>     extern balance bal[];
> in a .h file and
>     balance bal[YEARS];
> in the corresponding .c file.

As an interesting exercise for Bart and Malcolm,
I recommend that they put

extern balance *bal;

in the .h file and

balance bal[YEARS];

in the .c file, and rely on the the equivalence of arrays and pointers.