数组实现的队列

/*
 * queue.c
 *
 *  Created on: Dec 17, 2012
 *      Author: fsxchen
 *      线性表实现的队列
 */


#include 
#define MAXSIZE 100

typedef struct
{
	int data[MAXSIZE];
	int front;
	int rear;
}SqQueue;                          //定义一个队列的结构体

void InitQueue(SqQueue *q)
{
	q->front = 0;
	q->rear = 0;
}

/*若队列没有满，则插入一个元素*/

void InsertQueue(SqQueue *q)
{
	if((q->rear + 1) % MAXSIZE == q->front)  /*此时队列为满，这里采用的是循环队列处理的*/
		return;
	int val;
	printf("请输入你要插入的值");
	scanf("%d", &val);
	q->data[q->rear] = val;                   /*将值放到队尾*/
	q->rear = (q->rear + 1) % MAXSIZE;       /*队尾向后移动*/
	return;

}

int DeleteQueue(SqQueue *q)
{
	int n;
	if(q->front == q->rear)
	{
		printf("队列为空");
		return -1;
	}
	n = q->data[q->front];
	q->front = (q->front + 1) % MAXSIZE;
	return n;
}

void TraverseQueue(SqQueue *q)
{
	if(q->front == q->rear)
	{
		printf("队列为空");
		return ;
	}
	int ptr;
	ptr = q->front;
	while(ptr != q->rear)
	{
		printf("%d\t",q->data[ptr]);
		++ptr;
	}

}

int main()
{
	SqQueue s;
	InitQueue(&s);
	InsertQueue(&s);
	TraverseQueue(&s);
	InsertQueue(&s);
	TraverseQueue(&s);
	printf("%d",DeleteQueue(&s) );
	return 0;
}

只需要知道队列先进先出，只能在队尾增加，只能从队尾取出数据