链队列 (C语言描述)

#include
#include

typedef struct QNode
{
   int data;
   struct QNode *next;
}QNode;

typedef struct LiQueue
{
	QNode *front;
	QNode *rear;
}LiQueue;

LiQueue intiQueue()
{
	LiQueue *lq=(LiQueue *)malloc(sizeof(LiQueue));
	if(lq==NULL)
	lq->front=NULL;
	lq->rear=NULL;
	return *lq;
}

int isEmpty(LiQueue *lq)//判断是否为空
{
	if(lq->front==NULL || lq->rear==NULL)
	{
		return 0;
	}
	else
	{
		return 1;
	}

}

void enQueue(LiQueue *lq,int x)
{
	QNode *p;
	p=(QNode *)malloc(sizeof(QNode));
    p->data=x;
	p->next=NULL;
	if(lq->rear==NULL)
	{
      lq->front=p;
	  lq->rear=p;
	}
	else
	{
		lq->rear->next=p;
		lq->rear=p;
	}
}

int deQueue(LiQueue *lq,int *y)
{
	QNode *p=lq->front;
	if(lq->rear==NULL || lq->front==NULL)
	{
		return 0;
	}
	else
	{
		lq->front=lq->front->next;
	}
	*y=p->data;
	free(p);
	return 1;
}

int printQueue(LiQueue lq)
{
	if(lq.front==NULL || lq.rear==NULL)
	{
       return 0;		
	}
	while(lq.front!=NULL)
	{
		printf("%d\n",lq.front->data);
		lq.front=lq.front->next;
	}
	return 1;
}

void main()
{
	int y=0;
	LiQueue lq=intiQueue();
	enQueue(&lq,1);
	enQueue(&lq,2);
    enQueue(&lq,3);
	enQueue(&lq,4);
	enQueue(&lq,5);
	deQueue(&lq,&y);
	printQueue(lq);
	printf("出队列元素=%d\n",y);
}










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