#include <queue.h>
Status InitQueue(SqQueue *Q)
{
	Q->front=0;
	Q->rear=0;
	return  OK;
}


Status ClearQueue(SqQueue *Q)
{
	Q->front=Q->rear=0;
	return OK;
}


Status QueueEmpty(SqQueue *Q)
{ 
	if(Q->front==Q->rear) 
		return TRUE;
	else
		return FALSE;
}


int QueueLength(SqQueue *Q)
{
	return  (Q->rear-Q->front+MAXSIZE)%MAXSIZE;
}


Status GetHead(SqQueue *Q,QElemType *e)
{
	if(Q->front==Q->rear) 
		return ERROR;
	*e=Q->data[Q->front];
	return OK;
}


Status EnQueue(SqQueue *Q,QElemType e)
{
	if ((Q->rear+1)%MAXSIZE == Q->front)	
		return ERROR;
	Q->data[Q->rear]=e;			
	Q->rear=(Q->rear+1)%MAXSIZE;								
	return  OK;
}


Status DeQueue(SqQueue *Q,QElemType *e)
{
	if (Q->front == Q->rear)		
		return ERROR;
	*e=Q->data[Q->front];			
	Q->front=(Q->front+1)%MAXSIZE;
	return  OK;
}