Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!ames!hc!lanl!jlg
From: jlg@lanl.gov (Jim Giles)
Newsgroups: comp.lang.c
Subject: Re: "for" loops
Message-ID: <8544@lanl.gov>
Date: 28 Jan 89 23:54:02 GMT
References: <9527@smoke.BRL.MIL>
Organization: Los Alamos National Laboratory
Lines: 16

From article <9527@smoke.BRL.MIL>, by gwyn@smoke.BRL.MIL (Doug Gwyn ):
> In article <8515@lanl.gov> jlg@lanl.gov (Jim Giles) writes:
>>      for (x=0.0; x<=1.0, x+=0.1) {...}
>>For a loop from 0.0 to 1000.0 by 0.01 on a 32-bit floating-point machine,
>>the round-off of the last 100 adds is comparable to the increment itself!
>> [...]
> 
> No, I don't think so.  I've never known anyone to recommend a loop
> like the above.  [...]

I know of at least one person who recommended such a loop - the person
I was originally responding to.  He felt that the above loop was a
clear advantage over what Fortran DO loops could do.  He was wrong
on both counts (Fortran CAN do it and it's not an improvement).

J. Giles