Linux下的C语言编程——队列

ゝ一世哀愁。 2022-07-15 07:22 393阅读 0赞

队列基本功能的实现

#include <stdio.h>
    #include <stdlib.h>
    
    #define MAX 10
    
    struct queue_data
    {
    	int queue[MAX];
    	int top;
    	int buttom;
    };
    
    typedef struct queue_data Queue;
    typedef struct queue_data *Data;
    
    void creat_queue(Data *queue)
    {
    	*queue = (Data)malloc(sizeof(Queue));
    
    	if(!(*queue))
    	{
    		printf("malloc error!\n");
    		exit(-1);
    	}
    }
    
    void init_queue(Data queue)
    {
    	queue->top = -1;
    	queue->buttom = -1;
    }
    
    int is_full(Data *queue)
    {
    	if((*queue)->buttom == -1)
    	{
    		if((*queue)->top == MAX - 1)
    		{
    			return 1;
    		}
    		else
    		{
    			return 0;
    		}
    	}
    	else
    	{
    		if(((*queue)->top - (*queue)->buttom) + 1 == MAX)
    		{
    			return 1;
    		}
    		else
    		{
    			return 0;
    		}
    	}
    }
    
    int push_queue(Data *queue,int num)
    {
    	int i;
    
    	if(is_full(queue))
    	{
    		printf("the queue is full!\n");
    		exit(0);
    	}
    	else
    	{
    		if((*queue)->top < MAX - 1)//<MAX - 1涓轰簡闃叉top = max,瓒呭嚭queue[i]鐨勮寖鍥?		{
    			((*queue)->top)++;
    			((*queue)->queue[(*queue)->top]) = num;
    		}
    		else
    		{
    			for(i = (*queue)->buttom; i <= (*queue)->top; i++)
    			{
    				(*queue)->queue[i - (*queue)->buttom] = (*queue)->queue[i];
    			}
    			(*queue)->top = (*queue)->top - (*queue)->buttom - 1;
    			(*queue)->buttom = 0;
    			((*queue)->top)++;
    			((*queue)->queue[(*queue)->top]) = num;
    		}
    
    		return 1;
    	}
    }
    
    int is_empty(Data *queue)
    {
    	if((*queue)->top <= (*queue)->buttom)
    	{
    		return 1;
    	}
    	else
    	{
    		return 0;
    	}
    }
    
    int pop_queue(Data *queue)
    {
    	if(is_empty(queue))
    	{
    		printf("the queue is empty!\n");
    		exit(0);
    	}
    	else
    	{
    		return((*queue)->queue[++((*queue)->buttom)]);
    	}
    }
    
    void get_queue(Data * queue)
    {
    	if(is_empty(queue))
    	{
    		printf("the queue is empty!\n");
    		return ;
    	}
    	else
    	{
    		while((*queue)->buttom < (*queue)->top)
    		{
    			((*queue)->buttom)++;
    			printf("queue = %d\n",(*queue)->queue[(*queue)->buttom]);
    		}
    	}
    }
    
    int main()
    {
    	Data queue;
    
    	creat_queue(&queue);
    	init_queue(queue);
    
    	int i;
    
    	for(i = 0; i < MAX; i++)
    	{
    		if(push_queue(&queue,i + 1))
    		{
    			printf("push num\t%d\n",i+1);
    		}
    	}
    
    	for(i = 0; i < MAX; i++)
    	{
    		printf("pop num:\t%d\n",pop_queue(&queue));
    	}
    
    	get_queue(&queue);
    
        return 0;
    }