1.31
secje
posted @ 2010年7月09日 06:24
in sicp
, 1508 阅读
(define (product term a next b) (if (> a b) 1 (* (term a) (product term (next a) next b)))) (define (inc n) (+ n 1)) (define (indentity x) x) (define (factoral n) (product indentity 1 inc n)) (define (pi-up n) (cond ((= n 1) 2) ((even? n) (+ n 2)) (else (+ n 1)))) (define (pi-down n) (cond ((even? n ) (+ n 1)) (else (+ n 2)))) (define (sequare x) (* x x)) (define (get-pi n) (* 1.0 (/ (product pi-up 1 inc n) (product pi-down 1 inc n)))) (define (pi-all n) (cond ((= n 1) (/ 2 3)) ((even? n) (/ (+ n 2) (+ n 1))) (else (/ (+ n 1) (+ n 2))))) (define (fast-pi n) (* 1.0 (product pi-all 1 inc n))) (define (product term a next b result) (if (> a b) result (product term (next a) next b (* result (term a))))) (define (product term a next b) (define (iter a result) (iter (next a) (* (term a) result))) (iter a 1))
2021年2月26日 22:13
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2022年9月26日 22:03
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2024年1月17日 06:32
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