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From: jsdy@hadron.UUCP (Joseph S. D. Yao)
Newsgroups: net.lang.c
Subject: Re: PASSING MULTIDIMENSIONAL ARRAYS
Message-ID: <104@hadron.UUCP>
Date: Fri, 29-Nov-85 19:15:11 EST
Article-I.D.: hadron.104
Posted: Fri Nov 29 19:15:11 1985
Date-Received: Sun, 1-Dec-85 03:32:57 EST
References: <138@brl-tgr.ARPA>
Reply-To: jsdy@hadron.UUCP (Joseph S. D. Yao)
Organization: Hadron, Inc., Fairfax, VA
Lines: 26
Summary: Only with constant dimensions

In article <138@brl-tgr.ARPA> jeff@isi-vaxa.arpa (Jeffery A. Cavallaro) writes:
>I have an application where I want to pass a 2D array to a subroutine.
>The data does not easily avail itself to being converted to a 1D array
>of structures.  How can one access the array in the subroutine???
>Calling routine:
>	struct x a[M][N];
>	subrout(M, N, a);
>The only way I can see to do it is:
>	subrout(m, n, a)
>	struct x *a;
>and do the address arithmetic yourself.  ...

Yes, you could do it the second way; and unfortunately this is the
only way to implement a routine that has several different sized
matrices being passed to it.  However, it seems to me that you are
implying a known fixed matrix size in your application.  In that
case, you can call:
	struct x a[M][N];
	subrout(a)
and just declare
	subrout(arg)
	  struct x arg[M][N];
	{  ...
-- 

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