strange behavior with perl v 5.8.8
Thu Sep 27 15:47:00 GMT 2007
On 27 September 2007 16:14, Andrew Louie wrote:
> I've run into a strange adding problem with perl:
> when incrementing by 0.1
... an infinite, non-repeating fraction in binary floating-point, that can
only be inexactly approximated ...
> i get a strange behavior where at some
> arbitrary number, it will append 0.9999999999 to the end of the
'fraid so. Use rounding if you like.
This is bog-standard floating point behaviour, part of the fundamental
limitations of the representation. See, e.g.
or in general google for "floating point accuracy".
Can't think of a witty .sigline today....
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