From: "Florent" <florent AT oih DOT rwth-aachen DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: twin complement ......
Date: Thu, 17 Aug 2000 20:17:31 +0200
Organization: Aachen University of Technology (RWTH)
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

the complement of 0x10 is 0xF0 of course ....... sorry I wrote 16 which is
the decimal value ..... :o(

the pb is when I do :

int x=0x10
x=~x+1;

we found x=xFFF0, and that's not what I would like to get (0xF0), the pb is
that the non operation booleen transform all bits of the value and if this
value can be coded with less bits, we get an error. I'm thinking of doing
several operation , depends of how many bits the value is coded, but it's
going to be a big functions. my question was if there any functions for
doing it ???





Florent a écrit dans le message <8ngqu9$fl8$1 AT nets3 DOT rz DOT RWTH-Aachen DOT DE>...
>Hi,
>
>Is there any fonctions for the twin complement ?
>
>For example with 10 (in hexa) the twin complement is 16 but when I tried to
>get it in my computer with
>(~value)+1
>... it's completly wrong because the programme do the "non" booleen
>operation on all the bits
>
>I will have to make it myself or there is a fonction for it ?
>
>thank you for your help,
>
>Florent.
>
>