Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!hplabs!otter!pdc
From: pdc@otter.hple.hp.com (Damian Cugley)
Newsgroups: comp.lang.c
Subject: Re: "Numerical Recipes in C" is nonportable code
Message-ID: <1670013@otter.hple.hp.com>
Date: 30 Aug 88 20:18:02 GMT
References: <5162@hoptoad.uucp>
Organization: Hewlett-Packard Laboratories, Bristol, UK.
Lines: 14

... if you want to index an array starting at one, but

	int	b[4], *bb = &b[-1];

and variations thereof are interdit, why not use

	int	bb[5];

Before I am flamed to death for wasting *four* *whole* *bytes* of memory,
I think I can claim excemption under the `speed-vs-space' banner.
Using a pointer as an array probably involves an extra instruction or
CPU cycle somewheres - and `#define bb(x) (b[(x)-1])' does countless
`invisible' subtractions...

pdc