Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!postnews.google.com!news2.google.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail
NNTP-Posting-Date: Thu, 05 Apr 2012 05:48:47 -0500
Message-ID: <4F7D788E.45B9@mindspring.com>
Date: Thu, 05 Apr 2012 06:48:46 -0400
From: pete <pfiland@mindspring.com>
Reply-To: pfiland@mindspring.com
Organization: PF
X-Mailer: Mozilla 3.04Gold (WinNT; I)
MIME-Version: 1.0
Newsgroups: comp.lang.c
Subject: Re: Odd benchmark behavior
References: <9talg3F84gU1@mid.individual.net> <4f70351c$0$1385$4fafbaef@reader2.news.tin.it> <4f703bfa$0$1386$4fafbaef@reader2.news.tin.it> <4f71688a$0$1383$4fafbaef@reader2.news.tin.it> <4f716921$0$1383$4fafbaef@reader2.news.tin.it> <4F727C20.5A49@mindspring.com> <4f7d7076$0$1379$4fafbaef@reader2.news.tin.it>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Lines: 45
X-Usenet-Provider: http://www.giganews.com
NNTP-Posting-Host: 4.154.216.205
X-Trace: sv3-P3TTd2QxXEEQiIHxktno5a90WJBR48LlO8vsCLm691wmi+2jsttflfhD+1hpN0DqXBZbysOdtqRK9IE!ACpSFima7Ra+eCtWAo9uUmqusgiwGBUFuqaLpg7Yx8iaENNHl0KdKk4vZ1JhT4/aTyYdcj5vN5dC!9AcXyzC5WdU=
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly
X-Postfilter: 1.3.40
X-Original-Bytes: 2262
Xref: csiph.com comp.lang.c:19354

io_x wrote:
> 
> "pete" <pfiland@mindspring.com> ha scritto nel messaggio
> news:4F727C20.5A49@mindspring.com...
> > io_x wrote:
> >>
> >> "io_x" <a@b.c.invalid> ha scritto nel messaggio
> >> news:4f71688a$0$1383$4fafbaef@reader2.news.tin.it...
> >>
> >> there is someone that know if  (unsigned) sqrt(9.0) can be
> >> follow the C standard the unsigned 2???
> >> Thank you
> >
> > You could do it this way instead:
> >
> > la:
> >    v = p;
> >    for (i = ((1 == v) + v) / 2; v > i; i = (p / v + v) / 2) {
> >        v = i;
> >    }
> 
> the above is wrong, for example
> if p==0 than v=0, i=0/2=0; 0>0 is false;
> so i=0/0 and here seg fault

After 0>0 is false, the loop stops 
and then there is no i=0/0.


 
> if 0.0<p<1.0  i have some doubit too

> it depend how they round float number

This is the code that you wrote:

    #define  u32  uint32_t

    u32    i, p, cnt, v;

There are no float numbers in that code.


-- 
pete