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sicp-all-tasks/sicp/5_002e1

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Exercise 5.1: Design a register machine to
compute factorials using the iterative algorithm specified by the following
procedure. Draw data-path and controller diagrams for this machine.
(define (factorial n)
(define (iter product counter)
(if (> counter n)
product
(iter (* counter product)
(+ counter 1))))
(iter 1 1))