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From: scjones@sdrc.UUCP (Larry Jones)
Newsgroups: comp.lang.c
Subject: Re: C pointers
Keywords: C
Message-ID: <526@sdrc.UUCP>
Date: 10 Feb 89 23:48:44 GMT
References: <1707@shaffer.UUCP>
Organization: Structural Dynamics Research Corp., Cincinnati
Lines: 38

In article <1707@shaffer.UUCP>, jcrowe@shaffer.UUCP (Joe Crowe) writes:
> Consider this a niave question.  I have a structure which contains among
> other things a pointer to an array of structures declared as follows:
> 
> typedef struct XYZ
> {
>      .
>      .
>      .
>      struct diag_cmd    (*p_cmd_blk)[];
>      .
>      .
> } t_xyz;
> 
>      I am allocating storage for the above structures dynamically and
> setting the pointer p_cmd_blk manually.  All of this works.  But when
> I try various methods of accessing a structure member one of the array
> of structures I am getting compiler errors.  I have tried most combinations
> but with no luck.  Any ideas??

The rule of thumb is C is declarations look just like references
and vice versa.  (Of course, you do have to correct for the
structure name being in a different place in the declaration than
in the usage.)   Just work it out one level at a time.  The references
would look like:

	xyz_struct				- struct XYZ
	xyz_struct.p_cmd_blk			- ptr to ary of structs
	(*xyz_struct.p_cmd_blk)			- ary of structs
	(*xyz_struct.p_cmd_blk)[i]		- struct diag_cmd
	(*xyz_struct.p_cmd_blk)[i].member	- member

----
Larry Jones                         UUCP: uunet!sdrc!scjones
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