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From: jeff@isi-vaxa.arpa (Jeffery A. Cavallaro)
Newsgroups: net.lang.c
Subject: PASSING MULTIDIMENSIONAL ARRAYS
Message-ID: <138@brl-tgr.ARPA>
Date: Wed, 27-Nov-85 18:30:05 EST
Article-I.D.: brl-tgr.138
Posted: Wed Nov 27 18:30:05 1985
Date-Received: Fri, 29-Nov-85 21:43:02 EST
Sender: news@brl-tgr.ARPA
Lines: 28

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???

For example:

Calling routine:

	struct x a[M][N];
	
	subrout(M, N, a);

C does not have "adjustable arrays" like FORTRAN.  So what is one to do?

The only way I can see to do it is:

	subrout(m, n, a)
	struct x *a;

and do the address arithmetic yourself.  I believe that this is OK, because
the innermost (leftmost) index is guaranteed to increase fastest, and
C compilers are required to be consistent about packing when doing
address arithmetic or aggregate allocation (I think).

Any hints???

					Thanx,
					Jeff