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From: eao@anumb.UUCP (e.a.olson)
Newsgroups: comp.lang.fortran,comp.lang.pascal
Subject: Re: Array storage order
Message-ID: <105@anumb.UUCP>
Date: Mon, 29-Jun-87 19:56:33 EDT
Article-I.D.: anumb.105
Posted: Mon Jun 29 19:56:33 1987
Date-Received: Wed, 1-Jul-87 04:43:40 EDT
References: <1215@batcomputer.tn.cornell.edu>
Organization: AT&T Bell Labs, Andover MA
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Xref: mnetor comp.lang.fortran:134 comp.lang.pascal:176

> We're trying to arrange for a C subroutine library to be callable from
> Fortran and Pascal and also transportable between machines. 
> 
> One of the questions that has come up is with respect to the storage
> order of 2-dimensional arrays. In C, array element [1][2] is stored
> in memory immediately after element [1][1]. I believe this is locked
> into the language - pointer arithmetic and all that. On the Fortran
> compilers I can get to, (2,1), not (1,2), immediately follows (1,1).
> The pascal I haven't investigated yet.
> 
> Question: is this array storage order mandated by the Fortran-77 standard?
> How about the Pascal standard?   If so, then I'll document the arrays as being
> "backwards" in these languages. If not, I'll keep two code versions. 
> Obviously, two manual versions would be less hassle.
> 
> Help appreciated.
> 
> garry wiegand   (garry@oak.cadif.cornell.edu - ARPA)
> 		(garry@crnlthry - BITNET)

    The order is mandated by the standard.
    In fortran, arrays are stored in row-major order.  In 'C'
    and Pascal arrays are stored in column-major order.