prime-test
secje
posted @ 2010年5月10日 10:22
in sicp
, 733 阅读
(define (square x) (* x x))
(define (fast-prime? n times)
(define (expmod base exp m)
(cond ((= exp 0) 1)
((even? exp)
(remainder (square (expmod base (/ exp 2) m))
m))
(else
(remainder (* (remainder base m) (expmod base (- exp 1) m))
m))))
(define (fermat-test n)
(define (try-it a)
(= (expmod a n n) a))
(try-it (+ 1 (random (- n 1)))))
(cond ((= times 0) true)
((fermat-test n) (fast-prime? n (- times 1)))
(else false)))
PLT不认random，改用MIT Scheme了，看来要加快emacs的脚步了，越到后面谁知道还会发生什么，现在就是蛋疼的用PLT当编辑器和调试器，edwin做解释器
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