我面临着car和cdr函数的问题首先,我定义了一个名为x的列表所以x现在等于(a (bc) d ( (ef) g ) )例如,现在我需要只使用和cdr从列表中获取car g (!)正确的答案是:但是怎么做呢?我按照规则工作( car给出列表的头,cdr给出尾部)
而不是得到上面的答案,我总是得出错误的答案。
(unless (assoc d (cdr(assoc c (cdr(assoc b (cdr(assoc a vocab :test #'equal (when e
(unless (assoc e (cdr(assoc d (cdr(assoc c (cdr(assoc b (cdr(assoc a(assoc e (cdr(assoc d(<e