浙大数据结构 队列的实现（数组）

//浙大数据结构 队列的实现（数组）
#include
#include
#include 

#define ERROR -1
#define MAXSIZE 4

typedef int ElementType;
typedef int Position;

struct QNode {
	ElementType *Data;     /* 存储元素的数组 */
	Position Front, Rear;  /* 队列的头、尾指针 */
	int MaxSize;           /* 队列最大容量 */
};
typedef struct QNode *Queue;

Queue CreateQueue(int MaxSize)
{
	Queue Q = (Queue)malloc(sizeof(struct QNode));
	Q->Data = (ElementType *)malloc(MaxSize * sizeof(ElementType));
	Q->Front = Q->Rear = 0;
	Q->MaxSize = MaxSize;
	return Q;
}

bool IsFull(Queue Q)
{
	return ((Q->Rear + 1) % Q->MaxSize == Q->Front);
}

bool AddQ(Queue Q, ElementType X)
{
	if (IsFull(Q)) {
		printf("队列满\n");
		return false;
	}
	else {
		Q->Rear = (Q->Rear + 1) % Q->MaxSize;
		Q->Data[Q->Rear] = X;
		return true;
	}
}

bool IsEmpty(Queue Q)
{
	return (Q->Front == Q->Rear);
}

ElementType DeleteQ(Queue Q)
{
	if (IsEmpty(Q)) {
		printf("队列空\n");
		return ERROR;
	}
	else {
		Q->Front = (Q->Front + 1) % Q->MaxSize;
		return  Q->Data[Q->Front];
	}
}

int main()
{

	Queue Q = CreateQueue(MAXSIZE);

	AddQ(Q, 1);
	AddQ(Q, 2);
	AddQ(Q, 3);
	//实际只能放MAXSIZE-1个元素，
	//位置0不放数据，用以区分满(Q->Rear + 1) % Q->MaxSize == Q->Front和
	//空Q->Front == Q->Rear
	AddQ(Q, 4);  //队列满

	printf("%d \n", DeleteQ(Q));
	printf("%d \n", DeleteQ(Q));
	printf("%d \n", DeleteQ(Q));
	printf("%d \n", DeleteQ(Q)); //队列空

	free(Q->Data); 
	free(Q);

	_CrtDumpMemoryLeaks(); //检查内存泄漏

	system("pause");
	return 0;
}