顺序环形队列的各种基本运算

#include<iostream>
using namespace std;
#define MaxSize 50

typedef char ElemType;
typedef struct
{
	ElemType data[MaxSize];
	int front ,rear;
}SqQueue;

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

void ClearQueue(SqQueue *&q)
{
	free(q);
}

int QueueEmpty(SqQueue *&q)
{
	return (q->rear==q->front);
}

int enQueue(SqQueue * &q,ElemType e)
{
	if(q->rear+1%MaxSize==q->front)       //队满
		return 0;
	q->rear=(q->rear+1)%MaxSize;
	q->data[q->rear]=e;
	return 1;
}

int deQueue(SqQueue *&q,ElemType &e)
{
	if(q->rear==q->front)                 //队空
		return 0;
	
	q->front=(q->front+1)%MaxSize;
	e=q->data[q->front];
	return 1;
}

void main()
{
	ElemType e='0';
	SqQueue *q;
	cout<<"初始化队列；"<<endl;
	InitQueue(q);
	cout<<"判断队列是否为空：";
	if(QueueEmpty(q))
		cout<<"空；"<<endl;
	else
		cout<<"非空；"<<endl;
	cout<<"将元素a,b,c进队："<<endl;
	enQueue(q,'a');
	enQueue(q,'b');
	enQueue(q,'c');
	deQueue(q,e);
	cout<<"出队元素为："<<e<<endl;
	ClearQueue(q);
}