Back to notes -- Keyboard shortcut: 'u'  previous -- Keyboard shortcut: 'p'  next -- Keyboard shortcut: 'n'  Slide program -- Keyboard shortcut: 't'    A definition of fac with letrec.Lecture 2 - slide 10 : 35
Program 3
(letrec ((fac (lambda (n)
                 (if (= n 0) 1 (* n (fac (- n 1)))))))
  (fac 5))

; OK: 120