From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,2078dddcdcd8d83
X-Google-Attributes: gid103376,public
From: ohk@fandango2-ether.nta.no (Ole-Hjalmar Kristensen FOU.TD/DELAB)
Subject: Re: Warning: Religious naming convention discussion :-) [was: assign
 help!!]
Date: 1997/05/14
Message-ID: <OHK.97May14101723@fandango2-ether.nta.no>#1/1
X-Deja-AN: 241437566
References: <5kjvcv$evt@news.cis.nctu.edu.tw> <dewar.863448507@merv>
 <EA33qK.KtA@world.std.com> <dewar.863495951@merv> <EA4J04.LpH@world.std.com>
 <dewar.863575928@merv>
Organization: Telenor Online Public Access
Newsgroups: comp.lang.ada
Date: 1997-05-14T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <dewar.863575928@merv> dewar@merv.cs.nyu.edu (Robert Dewar) writes:

   Bob Duff said

   <<4. Array indexing is defined in terms of pointer arithmetic.
   (Well, I admit this is a rather weak reason.)>>


   Actually I think that's a bit backwards, I would say that pointer arithmetic
   in C is defined in terms of indexing in some sense. A pointer in C is
   conceptually a pair (base address, offset), and pointer arithmetic adjusts
   the offset, which is closely related to an array index.
   (indeed it is EXACTLY what COBOL would call an array index :-)

   But I agree with some of your other reasons, although I do not agree
   that pointers and arrays are synonymous in C, it is just that there
   are implicit coercions between these two types.

>From "The C programming language", 2. ed., page 99:

"The correspondence between indexing and pointer arithmetic is very
close. By definition, the value of a variable or expression of type
array is the address of element zero of the array."

and further:

"In short, an array-and-index expression is equivalent to one written
as a pointer and offset"