C语言数组实现队列

#include <stdio.h>
#include <stdlib.h>
#include <string.h> 
#define MAX_QUEUE_SIZE 10

typedef struct
{
	unsigned int queue[MAX_QUEUE_SIZE];
	int head;
	int tail;
	int count;
}array_queue;

/*初始化队列*/
array_queue* initialize_array_queue()
{
	array_queue* arr_queue = NULL;
	arr_queue = (array_queue*)malloc(sizeof(array_queue));
	memset(arr_queue,0,sizeof(array_queue));
	arr_queue->head = MAX_QUEUE_SIZE-1;
	arr_queue->tail = MAX_QUEUE_SIZE-1;
	return arr_queue;
}

/*销毁队列*/
void destroy_array_queue(array_queue* arr_queue)
{
	if(arr_queue != NULL)
	{
		free(arr_queue);
	}
	return;
}
/*入队列*/
void in_queue(array_queue* arr_queue,unsigned int value)
{
	if(arr_queue != NULL)
	{
		if(arr_queue->count == MAX_QUEUE_SIZE)
		{
			return ;	
		}
		else
		{
			arr_queue->tail = (arr_queue->tail+1)%MAX_QUEUE_SIZE;
			arr_queue->queue[arr_queue->tail] = value;
			arr_queue->count++;
		}
	}
}
/*出队列*/
unsigned int out_queue(array_queue* arr_queue)
{
	unsigned int value;

	if(arr_queue != NULL)
	{
		if(arr_queue->count == 0)
		{
			return -1;	
		}
		else
		{
			arr_queue->head = (arr_queue->head+1)%MAX_QUEUE_SIZE;
			value = arr_queue->queue[arr_queue->head];
			arr_queue->queue[arr_queue->head] = 0;
			arr_queue->count--;
		}
	}
}

void print_queue(array_queue* arr_queue)
{
	int i = 0;
	for(i=0;i<MAX_QUEUE_SIZE;i++)
	{
		printf("%d,",arr_queue->queue[i]);
	}
	printf("\n");
	printf("head is %d, tail is %d\n",arr_queue->head,arr_queue->tail);
}

void main()
{
	array_queue* queue = initialize_array_queue();

	in_queue(queue, 5);
	in_queue(queue, 6);

	out_queue(queue);

	print_queue(queue);	
	destroy_array_queue(queue);

}