From:	"Rafał Maj" <r_maj AT poczta DOT onet DOT pl>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Odp: twin complement ......
Date:	Fri, 18 Aug 2000 01:08:22 +0200
Organization:	Academic Computer Center CYFRONET AGH
Lines:	30
Message-ID:	<8nhr5q$hs8$1@info.cyf-kr.edu.pl>
References:	<8ngqu9$fl8$1 AT nets3 DOT rz DOT RWTH-Aachen DOT DE> <8nhg65$ogi$1 AT nets3 DOT rz DOT RWTH-Aachen DOT DE>
NNTP-Posting-Host:	d-94-53-08.cyfronet.krakow.pl
X-Trace:	info.cyf-kr.edu.pl 966553594 18312 149.156.1.168 (17 Aug 2000 23:06:34 GMT)
X-Complaints-To:	news AT cyf-kr DOT edu DOT pl
NNTP-Posting-Date:	17 Aug 2000 23:06:34 GMT
X-Priority:	3
X-MSMail-Priority:	Normal
X-Newsreader:	Microsoft Outlook Express 5.00.2615.200
X-MimeOLE:	Produced By Microsoft MimeOLE V5.00.2615.200
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Florent <florent AT oih DOT rwth-aachen DOT de> wrote :
> What do you think about this function, I tried it with some values and it
> seems to work.
>
> long int TwinComplement(long int Value) {
>
>  long int Temp;
>  Temp=Value;
>  Value=(~Value)+1;
>  if (Temp<=0xf) Value=Value&0x0000000f;
>  if (Temp<=0xff) Value=Value&0x000000ff;
>  if (Temp<=0xfff) Value=Value&0x00000fff;
>  if (Temp<=0xffff) Value=Value&0x0000ffff;
>  if (Temp<=0xfffff) Value=Value&0x000fffff;
>  if (Temp<=0xffffff) Value=Value&0x00ffffff;
>  if (Temp<=0xfffffff) Value=Value&0x0fffffff;
>
>  return Value;
> }
>

1) This function will work quit slow (if you're going to use it in some loop
for example)
2) Can you tell me what exacly is twin complement ? How this function is
suppose to work ?

Rafal

- Raw text -