Exercise 3.28. Define an or-gate as a primitive function box. Your or-gate constructor should be similar to and-gate.
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(define (and-gate a1 a2 output) | |
(define (and-action-procedure) | |
(let | |
((new-value | |
(logical-and (get-signal a1) (get-signal a2)))) | |
(after-delay | |
and-gate-delay | |
(lambda () | |
(set-signal! output new-value))))) | |
(add-action! a1 and-action-procedure) | |
(add-action! a2 and-action-procedure) | |
'ok) | |
(define (or-gate a1 a2 output) | |
(define (or-action-procedure) | |
(let | |
((new-value | |
(logical-or (get-signal a1) (get-signal a2)))) | |
(after-delay | |
or-gate-delay | |
(lambda () | |
(set-signal! output new-value))))) | |
(add-action! a1 or-action-procedure) | |
(add-action! a2 or-action-procedure) | |
'ok) | |
(define (logical-or s1 s2) | |
(if | |
(or (eq? s1 1) (eq? s2 1)) | |
1 | |
0)) | |