练习3-33

原文

Exercise 3.33. Using primitive multiplier, adder, and constant constraints, define a procedure averager that takes three connectors a, b, and c as inputs and establishes the constraint that the value of c is the average of the values of a and b.

代码

(define (averager a b c)    (let ((sum (make-connector))          (d (make-connector)))        (adder a b sum)        (multiplier sum d c)        (constant (/ 1 2) d)        'ok))

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