From: eplmst AT lu DOT erisoft DOT se (Martin Stromberg)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: odd or even?
Date: 8 Mar 2000 08:20:55 GMT
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Damian Yerrick (DONT DOT YOU DOT DAREd_yerrick AT hotmail DOT comSEND DOT SPAM) wrote:
: On 5 Mar 2000 13:39:56 GMT, eplmst AT lu DOT erisoft DOT se (Martin Stromberg)
: wrote:

: >One's complement works as well:
: >+0 = 0x00000000 (lowest bit not set)
: >-0 = 0x80000000 (lowest bit not set)
: >-1 = 0x80000001 (lowest bit set)
: >-2 = 0x80000002 (lowest bit not set)

: This isn't ones' complement.  This is called "sign bit" representation
: and is one of the first things taught in Intro to Digital Logic
: (EC130) here at Rose.

Ooops! Sorry.

: >What other interesting representations are there? 

: There's ones' complement, where -foo = 0xffffffff xor foo

: -2 0xfffffffd
: -1 0xfffffffe
: -0 0xffffffff
: +0 0x00000000
: +1 0x00000001
: +2 0x00000002

So here the bit 0 masking does not work. So again it seems we should
let the optimisations be done by the compiler...


This Mortal Coil, Blood,

							MartinS


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