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How to set signifcant figures of $((..)) ?

X-seq: zsh-users 19049
From: Han Pingtian <hanpt@xxxxxxxxxxxxxxxxxx>
To: zsh-users@xxxxxxx
Subject: How to set signifcant figures of $((..)) ?
Date: Tue, 2 Sep 2014 21:22:35 +0800
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Hi,

I have this results:

  % zsh  -f
  localhost% print $((2**63))
  -9223372036854775808
  localhost% print $((2.0**63))
  9.2233720368547758e+18
  localhost%

How can the second print puts 9.223372036854775808e+18, please?

Thanks in advance!

Follow-Ups:
- Re: How to set signifcant figures of $((..)) ?
  - From: Kurtis Rader
- Re: How to set signifcant figures of $((..)) ?
  - From: Peter Stephenson

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