注意：判空，判佇列滿，
MyQueue.h

#ifndef MYQUEUE_H
#define MYQUEUE_H
/*
    環形佇列C++實現
*/
class MyQueue{
public:
    MyQueue(int queueCapacity);     //建構函式
    virtual ~MyQueue();
    void ClearQueue();
    bool QueueEmpty() const;
    bool QueueFull() const;
    int QueueLength() const;
    bool EnQueue(int element);
    bool
 
 DeQueue(int &element);
    void QueueTraverse();
private:
    int *m_pQueue;
    int m_iQueueLen;
    int m_iQueueCapacity;
    int m_iHead;
    int m_iTail;
};
#endif

MyQueue.cpp

#include "MyQueue.h"
#include<iostream>
using namespace std;

MyQueue::MyQueue(int queueCapacity){
    m_iQueueCapacity = queueCapacity;
    m_pQueue = new
 
 int[m_iQueueCapacity];//有可能申請失敗
    ClearQueue();
}

MyQueue::~MyQueue(){
    delete[]m_pQueue;
    m_pQueue = nullptr;


}
void MyQueue::ClearQueue(){
    m_iHead = 0;
    m_iTail = 0;
    m_iQueueLen = 0;
}

bool MyQueue::QueueEmpty() const{
    return m_iQueueLen == 0 ? true : false;
}

int MyQueue::QueueLength() const
 
{
    return m_iQueueLen;
}

bool MyQueue::QueueFull() const{
    if (m_iQueueLen == m_iQueueCapacity)
        return true;
    return false;
}
bool MyQueue::EnQueue(int element){
    if (QueueFull())
        return false;
    m_pQueue[m_iTail] = element;
    m_iTail++;
    m_iQueueLen++;
    m_iTail %= m_iQueueCapacity;
    return true;
}

bool MyQueue::DeQueue(int &element){
    if (QueueEmpty())
        return false;
    element = m_pQueue[m_iHead];
    m_iHead++;
    m_iQueueLen--;
    m_iHead %= m_iQueueCapacity;
    return true;
}

void MyQueue::QueueTraverse(){
    cout << endl;
    for (int i = m_iHead; i < m_iQueueLen + m_iHead; i++){
        cout << m_pQueue[i%m_iQueueCapacity] << endl;
    }
    cout << endl;
}

Test.cpp

#include<iostream>
#include "MyQueue.h"
using namespace std;

int main(){
    MyQueue *p = new MyQueue(4);
    p->EnQueue(10);
    p->EnQueue(12);
    p->EnQueue(16);
    p->EnQueue(18);
    p->QueueTraverse();

    int e = 0;
    p->DeQueue(e);
    cout << endl;
    cout << e << endl;

    p->DeQueue(e);
    cout << endl;
    cout << e << endl;

    cout << endl;
    p->QueueTraverse();

    p->ClearQueue();
    p->QueueTraverse();

    p->EnQueue(20);
    p->EnQueue(30);
    p->QueueTraverse();

    delete p;
    p = NULL;
    return 0;
}