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From: Andreas Leitgeb <avl@logic.at>
Newsgroups: comp.lang.java.programmer
Subject: Re: Can Java compute 9^(9^9) ?
Date: Wed, 6 Jun 2018 08:50:52 -0000 (UTC)
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bursejan@gmail.com <bursejan@gmail.com> wrote:
> The 8.5 secs are plausible. I already tested another
> system, which could do it in around 20 secs.
>
>   ECLiPSe Constraint Logic Programming System [kernel threads]
>   Version 7.0 #36 (x86_64_nt), Sun Jan 28 10:18 2018
>
>   [eclipse 2]: _ is 9^(9^9).
>   Yes (20.09s cpu)
>
> So the magnitude of this time measure is plausible.
> I did not double check the result, the 370 mio digits. 
>
> Not sure whether I should check the result..

Maybe, both SWI-Prolog and ECLiPSe are both smart in detecting
and avoiding calculations "assigned" to "_".

Unless you can store the result in a variable and query some
properties of it for checking it might just have skipped some
of the calculations.