【SICP练习】120 练习3.51

练习3-51

原文

Exercise 3.51. In order to take a closer look at delayed evaluation, we will use the following procedure, which simply returns its argument after printing it:

(define (show x)    (display-line x)    x)

What does the interpreter print in response to evaluating each expression in the following sequence?

(define x (stream-map show (stream-enumerate-interval 0 10))) (stream-ref x 5) (stream-ref x 7)

代码

(define (show x)  (display-line x)  x)(define x (stream-map show (stream-enumerate-interval 0 10)))0;Value: x(stream-ref x 5)12345;Value: 5(stream-ref x 7)67;Value: 7

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