【SICP练习】113 练习3.33

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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