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wrong value for pi?

X-seq: zsh-workers 25352
From: Julius Plenz <julius@xxxxxxxxx>
To: zsh-workers@xxxxxxxxxx
Subject: wrong value for pi?
Date: Wed, 30 Jul 2008 14:54:58 +0200
Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm

Hi!

Playing around, I noticed that Z-Shell wrongly evaluates the
expression "4.0*atan(1)" (which is equal to pi):

    zsh> zmodload zsh/mathfunc
    zsh> typeset -F 48 pi='4.0*atan(1)'
    zsh> echo $pi
    3.141592653589793115997963468544185161590576171875
                     ^- here the first error occurs

Is this indended, a bug or just owing to some sort of optimization or some C
library's shortcomings?

Julius

Follow-Ups:
- Re: wrong value for pi?
  - From: Peter Stephenson

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