链队列(LinkQueue.h和LinkQueue.c) 分享

/*链队列存储结构(LinkQueue.h)*/
typedef struct QNode
{
QElemType data;
struct QNode *next;
}QNode, *QueuePtr;

typedef struct
{
QueuePtr front;
QueuePtr rear;
}LinkQueue;

/**************************************************/

/* 链队列的基本操作(LinkQueue.c)*/
Status InitQueue(LinkQueue *Q)
{
if ((Q->front = (QueuePtr) malloc(sizeof(QNode))) == NULL)
  exit(OVERFLOW);
Q->rear = Q->front;
Q->front->next = NULL;
return OK;
}

Status DestroyQueue(LinkQueue *Q)
{
QueuePtr p = Q->front;

while (p != Q->rear)
{
  Q->front = p->next;
  free(p);
  p = Q->front;
}
free(Q->rear);
Q->front = Q->rear = NULL;
return OK;
}

Status DestroyQueue1(LinkQueue *Q)
{
while (Q->front != NULL)
{
  Q->rear = Q->front->next;
  free(Q->front);
  Q->front = Q->rear;
}
return OK;
}

Status ClearQueue(LinkQueue *Q)
{
QueuePtr p = Q->front->next;

while(p != NULL)
{
  Q->rear = p->next;
  free(p);
  p = Q->rear;
}
Q->rear = Q->front;
Q->front->next = NULL;
return OK;
}

Status QueueEmpty(LinkQueue Q)
{
return Q.front == Q.rear;
}

int QueueLength(LinkQueue Q)
{
int len = 0;

while (Q.front != Q.rear)
{
  len++;
  Q.front = Q.front->next;
}
return len;
}

Status GetHead_Q(LinkQueue Q,QElemType *e)
{
if (!QueueEmpty(Q))
{
  *e = Q.front->next->data;
  return OK;
}
else
  return FALSE;
}

Status EnQueue(LinkQueue *Q,QElemType e)
{
QueuePtr p;

if ((p = (QueuePtr) malloc(sizeof(QNode))) == NULL)
  exit(OVERFLOW);
p->data = e;
p->next = NULL;

Q->rear->next = p;
Q->rear = p;
return OK;
}

Status DeQueue(LinkQueue *Q,QElemType *e)
{
QueuePtr p;

if (!QueueEmpty(*Q))
{
  p = Q->front->next;
  if (p == Q->rear)
   Q->rear = Q->front;
  Q->front->next = p->next;
  *e = p->data;
  free(p);
 
  return OK;
}
else
  return FALSE;
}

Status QueueTraverse(LinkQueue Q,Status(*Visit)(QElemType))
{
QueuePtr p = Q.front->next;
while (p != NULL)
{
  if (!Visit(p->data))
   return ERROR;
  p = p->next;
}
printf("\n");
return OK;
}

/***************************************************/

/*LinkQueue_Main.c 检验LinkQueue.c的主程序 */
#include"DS.h"
typedef int QElemType;
#include"LinkQueue.h"
#include"LinkQueue.c"

Status visit(QElemType i)
{
   printf("%d ",i);
   return OK;
}

void main()
{
   int i;
   QElemType d;
   LinkQueue q;
   i=InitQueue(&q);
   if(i)
     printf("成功地构造了一个空队列!\n");
   printf("是否空队列？%d(1:空 0:否)  ",QueueEmpty(q));
   printf("队列的长度为%d\n",QueueLength(q));
   EnQueue(&q,-5);
   EnQueue(&q,5);
   EnQueue(&q,10);
   printf("插入3个元素(-5,5,10)后,队列的长度为%d\n",QueueLength(q));
   printf("是否空队列？%d(1:空 0:否)  ",QueueEmpty(q));
   printf("队列的元素依次为：");
   QueueTraverse(q,visit);
   i=GetHead_Q(q,&d);
   if(i==OK)
     printf("队头元素是：%d\n",d);
   DeQueue(&q,&d);
   printf("删除了队头元素%d\n",d);
   i=GetHead_Q(q,&d);
   if(i==OK)
     printf("新的队头元素是：%d\n",d);
   ClearQueue(&q);
   printf("清空队列后,q.front=%u q.rear=%u q.front->next=%u\n",q.front,q.rear,q.front->next);
   DestroyQueue(&q);
   printf("销毁队列后,q.front=%u q.rear=%u\n",q.front, q.rear);
}