Structure and Interpretation of Computer Programs by Harold Abelson; Gerald Jay Sussman; Julie Sussman

Author:Harold Abelson; Gerald Jay Sussman; Julie Sussman
Language: eng
Format: mobi
ISBN: 0262011530
Publisher: MIT Press
Published: 2011-12-03T05:58:22+00:00

(define ones (cons-stream 1 ones))

This works much like the definition of a recursive procedure: ones is a pair whose car is 1 and whose cdr is a promise to evaluate ones. Evaluating the cdr gives us again a 1 and a promise to evaluate ones, and so on.

We can do more interesting things by manipulating streams with operations such as add-streams, which produces the elementwise sum of two given streams:62

(define (add-streams s1 s2)

(stream-map + s1 s2))

Now we can define the integers as follows:

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