From: Damian Yerrick <DONT DOT YOU DOT DAREd_yerrick AT hotmail DOT comSEND DOT SPAM>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: odd or even?
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NNTP-Posting-Date: Mon, 06 Mar 2000 22:43:24 GMT
Distribution: world
Date: Mon, 06 Mar 2000 22:43:24 GMT
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

On Mon, 06 Mar 2000 09:48:33 -0500, "Campbell, Rolf [SKY:1U32:EXCH]"
<moscoop AT americasm01 DOT nt DOT com> wrote:

>Martin Stromberg wrote:
>
>> : >It should work fine with signed integers....
>> : >-1 = 0xFFFFFFFF (lowest bit set)
>> : >-2 = 0xFFFFFFFE (lowest bit not set)
>>
>> : Might not work on other machines, though.  (I honestly don't know,
>> : I've never used a machine that wasn't 2's-complement)
>>
>> 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)

(That's not ones' complement; that's sign bit.)

>> What other interesting representations are there?
>
>    Well, I've heard of a format where you only had to flip 1 bit to
>increment or decrement any integer.

Gray-like code.  Useful for encoding states in hardware finite
state machines and for reading the rotation of a shaft.

>But I don't know if anyone actually make a processor for it.

It's usually done with lookup tables from Gray to 2's.

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