帶頭結點的單鏈表head為空的判定條件是()
A.head= =NULL
B.head->next= =NULL
C.head->next= =head
D.head!=NULL
正確答案:head->next= =NULL
帶頭結點的單鏈表head為空的判定條件是()
A.head= =NULL
B.head->next= =NULL
C.head->next= =head
D.head!=NULL
正確答案:head->next= =NULL