【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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