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队列空判断条件为front == rear，访问队头元素操作为return queue[front]
front == rear
return queue[front]
队列空判断条件为(rear + 1) % MAXSIZE == front，访问队头元素操作为return queue[rear]
(rear + 1) % MAXSIZE == front
return queue[rear]
队列空判断条件为front == 0 && rear == 0，访问队头元素操作为return queue[0]
front == 0 && rear == 0
return queue[0]
队列空判断条件为front == (rear + 1) % MAXSIZE，访问队头元素操作为return queue[front + 1]
front == (rear + 1) % MAXSIZE
return queue[front + 1]