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Re: Bug with numeric calculation

From: John Cowan
Subject: Re: Bug with numeric calculation
Date: Thu, 17 Aug 2006 14:51:49 -0400
User-agent: Mutt/1.3.28i

Dr. C. Griewatsch scripsit:

> echo 1.0 1.1 | gawk '{print 0.1+$1-$2}'
> 0
> echo 1.1 1.2 | gawk '{print 0.1+$1-$2}'
> 2.22045e-16
> The same error can be reproduced with gawk 3.1.5 on the same machine,
> or with gawk 3.1.0 on Solaris 5.8, and with gawk 3.1.4 on Suse 9.3.

This is not a gawk bug, but a consequence of the fact that 0.1 does
not have an exact representation using IEEE floating-point numbers.
If you want exact decimal fraction arithmetic, use bc or dc or
Common Lisp or Scheme.

Here lies the Christian,                        John Cowan
        judge, and poet Peter,                  http://www.ccil.org/~cowan
Who broke the laws of God                       address@hidden
        and man and metre.

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