带头结点的单链表head为空的判定条件是()
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带头结点的单链表head为空的判定条件是()
A.head—>next= =NUL
B.head= =NULL
C.head—>next= =head
D.head!=NULL

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B
带头结点的单链表head为空的判定条件是()
A.head—>next= =NUL
B.head= =NULL
C.head—>next= =head
D.head!=NULL

B