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From: jsdy@hadron.UUCP (Joseph S. D. Yao)
Newsgroups: net.lang.c
Subject: Re: No. of elements in initialized array
Message-ID: <295@hadron.UUCP>
Date: Wed, 12-Mar-86 08:59:05 EST
Article-I.D.: hadron.295
Posted: Wed Mar 12 08:59:05 1986
Date-Received: Sat, 15-Mar-86 19:52:43 EST
References: <250@vu-vlsi.UUCP>
Reply-To: jsdy@hadron.UUCP (Joseph S. D. Yao)
Organization: Hadron, Inc., Fairfax, VA
Lines: 19
Keywords: sizeof, struct
Summary: Two ways: yours, and the other.

In article <250@vu-vlsi.UUCP> colin@vu-vlsi.UUCP (Colin Kelley) writes:
>struct termentry { ... } term_tbl[] = { ... };
>  ...  However, code that must look at term_tbl[] needs to know how many
>elements it has.  The solution we're using now is:
>#define TERMCOUNT (sizeof(term_tbl)/sizeof(struct termentry))

This is one of the two classic solutions.  The other, if you have code
that steps through your structure, is to have an empty final member of
your structure array.  In your case, { "", 0, 0 }.  Then, code going
through the array can check for *tp->name == NUL, or for tp->xmax ==
0, or whatever you feel is best.

Incidentally, just as a matter of self-preservation in larger projects
(not to mention good style, sanity, etc.), it's been found good to
prefix each member of a structure with a "unique" prefix.  E.g.,
te_name, te_xmax, te_ymax.
-- 

	Joe Yao		hadron!jsdy@seismo.{CSS.GOV,ARPA,UUCP}