typedef struct Queue {? ? QElemType data[MAXSIZE];? ? QElemType front;? ? QElemType rear;? ? QElemType next;}SeqQueue;SeqQueue *sq;這是結(jié)構(gòu)體創(chuàng)建空隊(duì)后實(shí)現(xiàn)元素e入隊(duì)此時(shí)if (q->rear == MAXSIZE){? ? ? ? printf("隊(duì)列已滿");? ? ? ? exit(0);? ? }和?if((q->rear+1)%MAXSIZE ==q->front){??????????printf("隊(duì)列已滿");? ? ? ? exit(0);????}??其中if的條件是什么意思？?jī)烧哂惺裁磪^(qū)別？