Newsgroups: comp.lang.c
Path: utzoo!henry
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: How to reverse bits...
Message-ID: <1990Aug14.175900.23517@zoo.toronto.edu>
Organization: U of Toronto Zoology
References: <1990Aug13.185757.3236@sti.fi>
Date: Tue, 14 Aug 90 17:59:00 GMT

In article <1990Aug13.185757.3236@sti.fi> ttl@sti.fi (Timo Lehtinen) writes:
>What's the most optimal way to reverse the bits in an unsigned char,
>i.e. change from MSB to LSB ordering ?

What do you mean by "optimal"?  Fastest?  Most compact?  On what machine?
Your question has no single answer as it stands.

Unless your chars have a ridiculous number of bits, as others have mentioned,
a lookup table is almost certainly quickest.
-- 
It is not possible to both understand  | Henry Spencer at U of Toronto Zoology
and appreciate Intel CPUs. -D.Wolfskill|  henry@zoo.toronto.edu   utzoo!henry