With plain AutoLISP this is not possible.
  You can either pass all your arguments in a list like this:

  ;;; print a variable number of arguments (of any type)
  (defun my-princ (x)
    ;; simple version, for better stuff look at the SDK2: PRINTF.LLB
    (if (listp x)
      (mapcar 'princ x)
      (princ x)))

  Or you have to define the function in ADS and export it to
  AutoLISP.
  Then you are free to write:
    (ads-print "Hello " "World " 1 2 3)
  or even
    (ads-printf "Hello %s %i %i" "World" 2 3)

  Look at Reini Urban's and Vladimir Nesterovsky's ADS samples at
  http://xarch.tu-graz.ac.at/autocad/ads for implementations of the
  above examples.

  Official wishes were pointed to Autodesk regarding &optional as
  AutoLISP language enhancement, but it was not implemented in R14.

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