QSIZE
struct words *queue[QSIZE];
if (rear >= &queue[QSIZE - 1]) overflo();
if (front == &queue[QSIZE-1])
if (rear >= &queue[QSIZE-1])
if (q->length == QSIZE(q)) {
if (q->start == QSIZE(q))
#define QELEM(q,i) ((q)->elem[(i)%QSIZE(q)])