顺序队列的基本操作

傷城~ 2022-03-22 01:55 316阅读 0赞

**顺序队列会发生假溢出的情况，具体运行情况请看效果截图，相关代码如下：**  
**一、顺序队列的定义：**

#include<stdio.h>
    #include<stdlib.h>
    #include<assert.h>
    
    #define ERROR  0
    #define OK     1
    #define TRUE   1
    #define FALSE  0
    #define QUEUESIZE 10
    
    
    typedef int Status;
    typedef int QElemtype;
    
    typedef struct QNode{
    	QElemtype *base;
    	int front;
    	int rear;
    }SqQueue;

**二、顺序队列的初始化：**

void InitQueue(SqQueue *Q)
    {
    	Q->base=(QElemtype*)malloc(sizeof(QElemtype)*QUEUESIZE);
    	assert(Q->base!=NULL);
    	Q->front=Q->rear=0; 
    }

**三、入队操作：**

Status EnQueue(SqQueue *Q,QElemtype e)
    {
    	if(Q->rear==QUEUESIZE)
    	{
    		return ERROR;
    	}
    	Q->base[Q->rear]=e;
    	Q->rear++;
    	return OK;
    }

**四、判断队列是否为空：**

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

**五、求队列长度：**

Status QueueLength(SqQueue Q)
    {
    	return Q.rear-Q.front;
    }

**六、获取队头元素：**

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

**七、销毁队列：**

void DestoryQueue(SqQueue *Q)
    {
    	if(Q->base)      //队列Q存在 
    	{
    		free(Q->base);
    	}
    	Q->base=NULL;
    	Q->front=Q->rear=0;
    }

**八、清空队列：**

void ClearQueue(SqQueue *Q)
    {
    	Q->front=Q->rear=0;
    }

**九、出队操作：**

Status DeQueue(SqQueue *Q,QElemtype *e)
    {
    	if(Q->front==Q->rear)
    	{
    		return ERROR;
    	}
    	*e=Q->base[Q->front];
    	Q->front++;
    	return OK;
    }

**十、遍历队列：**

void QueueTraverse(SqQueue Q,void(*visit)(QElemtype))
    {
    	int i=Q.front;
    	while(i!=Q.rear)
    	{
    		visit(Q.base[i]);
    		i++;
    	}
    	printf("\n");
    } 
    void Print(QElemtype e)
    {
    	printf("%d ",e);
    }

**十一、主函数：**

int main()
    {
    	QElemtype i,e,d;
    	SqQueue Q;
    	InitQueue(&Q);
    	printf("请输入队列的%d个元素：\n",QUEUESIZE);
    	for(i=0;i<QUEUESIZE;i++)
    	{
    		scanf("%d",&d);
    		EnQueue(&Q,d);
    	}
    	printf("队列的元素为:");
    	QueueTraverse(Q,Print);
    	printf("队列长度为：%d\n",QueueLength(Q));
    	int k=QueueLength(Q);
    	printf("连续%d次由对头删除元素，队尾插入元素:\n",k/2);
    	for(i=0;i<k/2;i++)
    	{
    		DeQueue(&Q,&e);
    		printf("删除的队列的元素是：%d,请输入插入的元素：",e);
    		scanf("%d",&d);
    		EnQueue(&Q,d);
    	}
    	printf("新的队列元素为：\n");
    	QueueTraverse(Q,Print);
    	
    	int n=GetHead(&Q,&e);
    	if(n)printf("对头元素为：%d\n",e);
    	else {
    		printf("队空!\n");	return -1;
    	}
    	ClearQueue(&Q);
    	printf("清空队列后队列是否为空：%d\t(1:为空 ,0:不为空)\n",QueueEmpty(&Q));
    	DestoryQueue(&Q);
    	printf("销毁队列后:\nQ.base=%u\tQ.front=%d\tQ.rear=%d\t\n",Q.base,Q.front,Q.rear);
    	return 0; 
    }

**十二、运行效果截图：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNTUyNTMz_size_16_color_FFFFFF_t_70]

## 如何解决顺序队列假溢出的现象([https://blog.csdn.net/qq\_42552533/article/details/86648556][https_blog.csdn.net_qq_42552533_article_details_86648556]) ##

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNTUyNTMz_size_16_color_FFFFFF_t_70]: /images/20220322/b77f3869e4b141438f3728e6103494ee.png
[https_blog.csdn.net_qq_42552533_article_details_86648556]: https://blog.csdn.net/qq_42552533/article/details/86648556