Example MYFACT.PRT
; MYFACT
;
; Program for Proteus
;
; (C) 1998-2004 Simone Zanella Productions
;
; Ignore input and print out factorial of numbers from Start to End.
; Demonstrate the usage of recursive UDFs.

FUNCTION MyFact(n)

  IF LT(n, 1)
    ; This RETURN does not end definition, because inside IF
    RETURN 1
  FI
  ; This RETURN end definition
RETURN MUL(n, MyFact(DEC(n)))


; Here main code begins

Start = 0
End = 20

FOR J = Start TO End
  CONSOLELN "Factorial of " PFORMAT("2d", J) " is: " MyFact(J)
NEXT
ABORT 0
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