Re: Floating point arithmetic.

From: Subhash (subhash_daga_at_yahoo.com)
Date: 07/11/04 

Date: 11 Jul 2004 08:01:32 -0700

Amit Bhatia <bhatia2@nospam.com> wrote in message news:<ccqf0m$lfj$2@news.ks.uiuc.edu>...
> Hi there.
> I am cross posting this on comp.lang.c as well: sorry for same.
> The problem I am facing is as follows:
> For example:
> double a= 0.15;
> double b=2.4;
> const double VERYTINY =1.e-10;
> I know b/a = 16 and hence the remainder is zero; but I am not
> able to find any suitable thing to encode it into in c.
> for example (fmod(b,a)>VERYTINY) returns true!
> Now for this particular instance, (fmodf(b,a)>VERYTINY)
> does return false.
> But now if
> a=0.15;
> b=4.5;
> then fmodf and fmod both don't help...
>
> any suggestions on this?
> I was pointed to a reference on floating point arithmetic, where they talk
> of ulps etc, but is there a small function or fix to deal with this problem
> available somewhere?
>
> thanks,
> amit.

int main() {
  double a = 0.15;
  double b = 2.4;
  const double VERYTINY =1.e-10;
  printf("%d", (fmod(b,a) > VERYTINY));
  return 0;
}

This gives me false!

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