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From: Michael Heerdegen <michael_heerdegen@web.de>
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Subject: Re: Elisp function that performs numeric computations
Date: Wed, 19 Jan 2022 16:31:10 +0100
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fatiparty--- via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> I would like to construct an elisp function that performs numeric
> computations and outputs the result.

Unless this is just for learning: have a look at M-x quick-calc.
Requires to specify the input at a prompt.  But it offers much
more than Elisp's mathematical functions.

Michael.