学步园

真是无语，自己写好的队列的代码居然搁置了这么长的时间，拿出来晒一晒把：

#include <stdio.h>
#include <stdlib.h>

typedef int QElemType;
typedef int Status;
typedef struct QNode
{
	QElemType data;
	struct QNode *next;
}QNode,*QueuePtr;
typedef struct  
{
	QueuePtr front;
	QueuePtr rear;
}LinkQueue;



//基本操作
Status InitQueue(LinkQueue *Q);
Status DestroyQueue(LinkQueue *Q);
Status ClearQueue(LinkQueue *Q);
Status QueueEmpty(LinkQueue *Q);
Status QueueLength(LinkQueue *Q);
Status GetHead(LinkQueue *Q);
Status EnQueue(LinkQueue *Q,QElemType data);
Status DeQueue(LinkQueue *Q);
Status QueueTraverse(LinkQueue *Q);

//具体实现
Status InitQueue(LinkQueue *Q)
{
	Q->front = Q->rear = (QueuePtr)malloc(sizeof(QNode));
	if(! Q->front)exit(1);
	Q->front->next = NULL;
	return 1;
}

Status DestroyQueue(LinkQueue *Q)
{
	while(Q->front)
	{
		Q->rear = Q->front->next;
		free(Q->front);
		Q->front = Q->rear;
	}

	return 1;
}

Status ClearQueue(LinkQueue *Q)
{
	Q->front = Q->rear = NULL;

	return 1;
}

Status QueueEmpty(LinkQueue *Q)
{
	return ((Q->front == Q->rear)? 1:0);
}

Status QueueLength(LinkQueue *Q)
{
	int flag=0;
	QueuePtr temp = Q->front;
	while(temp->next)
	{
		Q->rear = temp->next;
		flag++;
		temp = Q->rear;
	}

	return flag;
}

Status GetHead(LinkQueue *Q)
{
	if(Q->front == Q->rear)
	{
		printf("Queue Handle Error.\n");
		exit(1);
	}
	return Q->front->next->data;
}

Status EnQueue(LinkQueue *Q,QElemType data)
{
	QueuePtr tmp;
	tmp = (QueuePtr)malloc(sizeof(QNode));
	tmp->data = data;
	tmp->next = NULL;

	Q->rear->next = tmp;
	Q->rear = tmp;
	return 1;
}

Status DeQueue(LinkQueue *Q)
{
	QueuePtr temp;
	if (Q->front == Q->rear)
	{
		printf("error.\n");
		return 0;
	}

	temp = Q->front->next;
	Q->front->next = temp->next;
	if(Q->rear == temp)Q->rear = Q->front;		//如果删除的是队列最后一个元素，要将队尾指针重新赋值
	free(temp);
	return 1;

}

Status QueueTraverse(LinkQueue *Q)
{
	QueuePtr temp = Q->front;
	if(Q->front == Q->rear)
	{
		printf("error!\n");
		return 0;
	}

	while(temp->next)
	{
		Q->rear = temp->next;
		printf("%d ",Q->rear->data);
		temp = Q->rear;
	}
	printf("\n");
	return 1;
}

int main()
{
	QElemType number;
	LinkQueue queue;
	InitQueue(&queue);
	while(scanf("%d",&number) != EOF)
	{
		EnQueue(&queue,number);
	}
	printf("当前该队列是 : %-6s\n",QueueEmpty(&queue) ? "空队列":"非空队列");
	printf("当前队列长度为: %-6d\n",QueueLength(&queue));
	printf("当前队头为： %-6d\n",GetHead(&queue));
	printf("当前遍历队列的结果是：\n");
	QueueTraverse(&queue);
	DestroyQueue(&queue);
	return 0;

}