【SICP练习】138 练习3.69

练习3-69

原文

代码

(define (triples s t u) (cons-stream (list (stream-car s) (stream-car t) (stream-car u)) (interleave (stream-map (lambda (x) (cons (stream-car s) x)) (stream-cdr (pairs t u))) (triples (stream-cdr s) (stream-cdr t) (stream-cdr u)))))
;Value: triples

(define (phythagorean-numbers) (define (square x) (* x x)) (define numbers (triles integers integers integers)) (stream-filter (lambda (x) (= (square (caddr x)) (+ (square (car x)) (square (cadr x))))) numbers))
;Value: phythagorean-numbers

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