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Setting variables, argumunts in defun

From: wael-zwaiter
Subject: Setting variables, argumunts in defun
Date: Sat, 13 Feb 2021 17:14:57 +0100 
I would like to set up devi and scal by selecting either one or
the other.  Wow can I do this in elisp.  Should I pass parameters
to the function.  Can one pass a string, then check its contents?

(defun deviscal ()

  (setq devi 0.18)
  (setq scal 0.2)

  (setq devi 0.0)
  (setq scal 1.0) )
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