【SICP练习】124 练习3.55

练习3-55

原文

Exercise 3.55. Define a procedure partial-sums that takes as argument a stream S and returns the stream whose elements are S0, S0 + S1, S0 + S1 + S2, …. For example, (partial-sums integers) should be the stream 1, 3, 6, 10, 15, ….

代码

(define (partial-sums s) (cons-stream (stream-car s) (add-streams (stream-cdr s) (partial-sums s))))

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