SICP: 第二章之序列操作:程序的共性
摘要:
#lang racket;guo lv qi(define (filter predicate sequence) (cond ((null? sequence) '()) ((predicate (car sequence)) (cons (car sequence) ... 阅读全文
posted @ 2015-04-20 21:52 Zachary_wiz 阅读(303) 评论(0) 推荐(0) 编辑