问题
单项选择题
带头结点的链队列中，队列头和队列尾指针分别为front和rear，则判断队列空的条件为
A．front==rear
B．front!=NULL
C．rear!==NULL
D．front==NULL
答案
参考答案：A
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带头结点的链队列中，队列头和队列尾指针分别为front和rear，则判断队列空的条件为
A．front==rear
B．front!=NULL
C．rear!==NULL
D．front==NULL
参考答案：A
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