设指针变量head指向循环链表的头结点,next是结点的指针域,则判断此链表为空的条件是
A. head->next==NULL B. head->next==head C. head->next!=NULL D. head->next!=head->next正确答案B
设指针变量head指向循环链表的头结点,next是结点的指针域,则判断此链表为空的条件是
A. head->next==NULL B. head->next==head C. head->next!=NULL D. head->next!=head->next正确答案B