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Date: Mon, 4 Mar 2013 07:29:02 +0000
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: zsh-users@zsh.org
Cc: embe8573@student.uu.se
Subject: force floating point arithmetics
Message-ID: <20130304072902.GA9639@chaz.gmail.com>
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User-Agent: Mutt/1.5.21 (2010-09-15)

Hiya,

this is a follow up on
http://unix.stackexchange.com/a/66755/22565

I was trying to find a way for $((...)) to always do floating
point arithmetics as in $((1/3)) not returning 0, and the best I
could come up with was appending . to any sequence of decimal
digits that is not otherwise part of a hex number (or number in
another base) or of a variable name or 12e-20 type numbers like:

setopt extendedglob
calc() printf '%.6g\n' $((${*//(#bm)(([0-9.]##[eE][-+][0-9]##|[[:alnum:]_#]#[.#_[:alpha:]][[:alnum:]_#]#)|([0-9]##))/$MATCH${match[3]:+.}}))
alias 'calc=noglob calc'

calc 1/3

...

Like the OP there, I'm surprised there's no easier way to do it,
but maybe I've not looked hard enough.

So, is there a way to force floating point arithmetics there
even when entering integer constants?

Thanks,
Stephane