摘要: 最初我们学到的是这种朴素的写法: (define (prime? n) (cond [(or (= n 2) (= n 3)) #t] [(even? n) #f] [else (prime-test-loop n)])) (define (prime-test-loop n) (let ((top 阅读全文
posted @ 2017-01-09 12:05 fmcdr 阅读(443) 评论(0) 推荐(0) 编辑