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kouddy/SICP 1.8

Created February 20, 2015 05:03
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SICP 1.8
(define (square x) (* x x))
(define (improve guess x)
(/ (+ (/ x (square guess)) (* 2 guess)) 3))
(define (good-enough? guess improved-guess x)
(< (/ (abs (- guess improved-guess)) guess) 0.001))
(define (cubic-root-iter guess x)
(if (good-enough? guess (improve guess x) x)
guess
(cubic-root-iter (improve guess x) x)))
(define (cubic-root x)
(cubic-root-iter 1.0 x))
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