【SICP练习】112 练习3.28

练习3-28

原文

Exercise 3.28. Define an or-gate as a primitive function box. Your or-gate constructor should be similar to and-gate.

代码

(define (or-gate input-1 input-2 output) (define (or-action-procedure) (let ((new-value (logical-or (get-signal input-1) (get-signal input-2)))) (after-delay or-gate-delay (lambda () (set-signal! output new-value))))) (add-action! input-1 or-action-procedure) (add-action! input-2 or-action-procedure) 'ok)

(define (logical-or x y) (if (or (= x 1) (= y 1)) 1 0))

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