C++队列实现代码：QUEUE.cpp

以下是一个用C++语言实现的队列代码，具体内容如下：

#include<iostream>
using namespace std;

#define MAX 100

class Queue {
private:
    int front, rear;
    int queue[MAX];

public:
    Queue() {
        front = rear = -1;
    }

    void enqueue(int item) {
        if (rear == MAX - 1) {
            cout << "队列已满！无法添加元素。" << endl;
        }
        else {
            if (front == -1) {
                front = 0;
            }
            rear++;
            queue[rear] = item;
            cout << "已向队列中添加元素：" << item << endl;
        }
    }

    void dequeue() {
        if (front == -1 || front > rear) {
            cout << "队列为空！无法删除元素。" << endl;
        }
        else {
            cout << "已从队列中删除元素：" << queue[front] << endl;
            front++;
        }
    }

    void display() {
        if (front == -1) {
            cout << "队列为空！" << endl;
        }
        else {
            cout << "队列元素为：";
            for (int i = front; i <= rear; i++) {
                cout << queue[i] << " ";
            }
            cout << endl;
        }
    }
};

int main() {
    Queue q;

    q.enqueue(10);
    q.enqueue(20);
    q.enqueue(30);

    q.display();

    q.dequeue();

    q.display();

    return 0;
}
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