单选题
带头结点的双向循环链表 L 为空的条件是( )
问题1选项
A.L->next = = L->prior
B.L->prior = =NULL
C.(L->next = = L)&&(L->prior = = L)
D.(L->next = = L)&&(L->prior =NULL)
A.L->next = = L->prior
B.L->prior = =NULL
C.(L->next = = L)&&(L->prior = = L)
D.(L->next = = L)&&(L->prior =NULL)
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