C语言——循环队列源代码

#define _QUEUE_DEFAULT_SIAE 8

typedef struct CycleSeqQueue{
     
	ElemType *base;
	int capacity;
	int front;
	int rear;
}CycleSeqQueue;


void CycleSeqQueueInit(CycleSeqQueue *pcq, int sz = _QUEUE_DEFAULT_SIZE);
void CycleSeqQueueShow(CycleSeqQueue *pcq);
void CycleSeqQueueEn(CycleSeqQueue *pcq,ElemType x);
void CycleSeqQueueDe(CycleSeqQueue *pcq);
void CycleSeqQueueDestroy(CycleSeqQueue *pcq);
bool CycleSeqQueueEmpty(CycleSeqQueue *pcq);
bool CycleSeqQueueFull(CycleSeqQueue *pcq);
void CycleSeqQueueFront(CycleSeqQueue *pcq);





void CycleSeqQueueInit(CycleSeqQueue *pcq, int sz)
{
     
	assert(pcq != NULL);
	pcq->capacity = sz > _QUEUE_DEFAULT_SIZE ? sz : _QUEUE_DEFAULT_SIZE;
	pcq->base = (ElemType*)malloc(sizeof(ElemType)*(pcq->capacity+1));
	pcq->front = pcq->rear = 0;
	
}
void CycleSeqQueueShow(CycleSeqQueue *pcq)
{
     
	assert(pcq != NULL);
	assert(pcq != NULL);
	int i = 0;
	for (i = pcq->front; i !=pcq->rear;)
	{
     
		printf("%d ", pcq->base[i]);
		i = (i + 1) % (pcq->capacity+1);
	}
	printf("\n");
}

void CycleSeqQueueEn(CycleSeqQueue *pcq,ElemType x)
{
     
	assert(pcq != NULL);
	if (CycleSeqQueueFull(pcq))
	{
     
		printf("队列已满，%d不能入队.\n",x);
		return;
	}
	pcq->base[pcq->rear] = x;
	pcq->rear = (pcq->rear + 1) % (pcq->capacity + 1);

}

void CycleSeqQueueDe(CycleSeqQueue *pcq)
{
     

	assert(pcq != NULL);
	if (CycleSeqQueueEmpty(pcq))
	{
     
		printf("队列已空，不能出队");
	}
	pcq->front = (pcq->front + 1) % (pcq->capacity + 1);

}
bool CycleSeqQueueFull(CycleSeqQueue *pcq)
{
     

	assert(pcq != NULL);
	return (pcq->rear + 1) % (pcq->capacity + 1) == pcq->front;

}

bool CycleSeqQueueEmpty(CycleSeqQueue *pcq)
{
     
	assert(pcq != NULL);
	return pcq->front == pcq->rear;
}
ElemType CycleSeqQueueSize(CycleSeqQueue *pcq)
{
     

	assert(pcq != NULL);
	size_t size = 0;
	size_t i= 0;
	for (i = pcq->front; i != pcq->rear; )
	{
     
		size++;
		i = (i + 1) % (pcq->capacity + 1);
	}

	return size;
}
void CycleSeqQueueDestroy(CycleSeqQueue *pcq)
{
     
	assert(pcq != NULL);
	free(pcq->base);
	pcq->base = NULL;
	pcq->front = pcq->rear =pcq->capacity= 0;
}
#endif