Exercise 3.58 · 习题

Exercise 3.58: Give an interpretation of the
stream computed by the following procedure:

(define (expand num den radix)
(cons-stream
(quotient (* num radix) den)
(expand (remainder (* num radix) den)
den
radix)))

(Quotient is a primitive that returns the integer quotient of two

integers.) What are the successive elements produced by (expand 1 7

10)? What is produced by (expand 3 8 10)?

练习 3.58：解释以下过程所计算的流的含义：

(define (expand num den radix)
(cons-stream
(quotient (* num radix) den)
(expand (remainder (* num radix) den)
den
radix)))

（Quotient 是一个基本过程，返回两个整数相除的整数商。）(expand 1 7 10) 依次产生哪些元素？(expand 3 8 10) 产生什么？