设带头结点的单向循环链表的头指针变量为head,则空循环链表的判定条件是
A.head==NULL B.head->next==NULL C.head->next==head D.head=NULL正确答案C
设带头结点的单向循环链表的头指针变量为head,则空循环链表的判定条件是
A.head==NULL B.head->next==NULL C.head->next==head D.head=NULL正确答案C
