【SICP练习】123 练习3.54

练习3-54

原文

Exercise 3.54. Define a procedure mul-streams, analogous to add-streams, that produces the elementwise product of its two input streams. Use this together with the stream of integers to complete the following definition of the stream whose nth element (counting from 0) is n + 1 factorial:

(define factorials (cons-stream 1 (mul-streams <??> <??>)))

代码

(define factorials (cons-stream 1
                (mul-streams (add-streams ones integers)
                         factorials)))
;Value: factorials

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