摘要：
Welcome to DrRacket, version 5.1.1 [3m].Language: R5RS; memory limit: 128 MB.> 9defune (abs x). . reference to undefined identifier: 9defune. . reference to undefined identifier: x> (defune (abs x) (cond ((> x 0) x) ((= x 0) 0) ((< x 0) (- x)))). . reference to undefined identifier: defu 阅读全文
posted @ 2011-06-26 13:37 红色壁虎 阅读(277) 评论(0) 推荐(0) 编辑