difference between pair? and list? 

 1 > (cons 1 3)
 2 (1 . 3)
 3 > (car (cons 1 3))
 4 1
 5 > (pair? (cons 1 3))
 6 #t
 7 > (cdr (cons 1 3))
 8 3
 9 > (list? (cons 1 3))
10 #f
11 > (pair? '())
12 #f
13 > (list? '())
14 #t

 

posted @ 2013-02-26 11:59  NiJc  阅读(104)  评论(0)    收藏  举报