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Multiplying a number to a inputbox value


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I just want to ask regarding the program I want to make cause I am having a problem on how to multiply the two values ( a real number and value from an input box):


Part of my DCL;

 : edit_box  {     
      key = "sc";     
             label = "ENTER SCALE :";
    alignment = centered;    
      width = 10;     
      fixed_width = true;
    is_enabled = false;}


Part in my LISP;

 (set_tile "sc" "500")
 (mode_tile "sc" 2)

 (action_tile "en" "(progn (setq en $value)(mode_tile \"sc\" 0))")
 (action_tile "accept"
   "(setq scale (get_tile \"sc\")
      (done_dialog 1)


(defun Styles()
 (setq size (* 0.00225 scale))



but after running the program just exit.


Hope someone can have time to help with this. Thank you!

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