num ← ##.factorial num                      ⍝ Tail recursive factorial.

An  illustration  of  tail recursion with a left argument accumulator. Note that
this function is intended only as an illustration of a coding technique. The re-
commended way of producing a factorial in APL is to use primitive function: _!_.


1 2 6 24 120 720 5040 40320 362880 3628800

See also: fibonacci

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