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Re: Bug fix for $((x**y)) algorithm on 64+ bits machines.
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From: |
Chet Ramey |
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Subject: |
Re: Bug fix for $((x**y)) algorithm on 64+ bits machines. |
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Date: |
Sun, 02 Oct 2011 21:07:57 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:6.0.2) Gecko/20110902 Thunderbird/6.0.2 |
On 9/19/11 2:35 PM, Stephane CHAZELAS wrote:
>> Thanks for the report. This looks like an independent reimplementation of
>> the "exponentiation by squaring" method. I did a little looking around,
>> and it's the best algorithm out there. I used a slightly different but
>> equivalent implementation.
> [...]
>
> FYI, ksh93 uses pow(3). So does zsh, but only in floating point
> mode.
Bash doesn't use floating point. It does all of its arithmetic in
intmax_t.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/