C++代码实现链队列详解

主要功能：

初始化、入队、出队、取队头元素、销毁队列、输出队列

完整代码展示：

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									#include <iostream>

									using namespace std;

									#define MAXSIZE 100

									typedef struct QueNode{  //定义链队列存储结构

									    int data;

									    QueNode * next;

									}QNode,*QuePtr;

									typedef struct {  //定义链队列指针

									    QuePtr front;  //队头指针

									    QuePtr rear;  //队尾指针

									}LinkQue;

									bool InitQue(LinkQue &Q){  //初始化

									    Q.front = Q.rear = new QNode;

									    if (!Q.front) return false;

									    Q.front->next = NULL;

									    return true;

									}

									bool DestoryQue(LinkQue &Q){  //销毁表

									    while (Q.front){

									        Q.rear = Q.front->next;

									        delete(Q.front);

									        Q.front = Q.rear;

									    }

									    return true;

									}

									bool EnQue(LinkQue &Q,int e){  //入队

									    QuePtr p = new QNode;

									    if(!p) return false;

									    p->data = e;

									    p->next = NULL;

									    Q.rear->next = p;

									    Q.rear = p;

									    return true;

									}

									bool OutQue(LinkQue &Q,int e){  //出队

									    if(Q.front == Q.rear) return false;  //队空

									    QuePtr p = Q.front->next;

									    e = p->data;

									    Q.front->next = p->next;

									    if(Q.rear == p) Q.rear = Q.front;

									    delete p;

									    return true;

									}

									bool GetHead(LinkQue Q,int &e){  //取队头元素

									    if(Q.front == Q.rear) return false;

									    e = Q.front->next->data;

									    return true;

									}

									void ShowList(LinkQue Q){   //输出链队

									    QuePtr p = Q.front->next;

									    while (p){

									        cout<<p->data<<" ";

									        p = p->next;

									    }

									    cout<<endl;

									}

									int main() {

									    LinkQue Q;

									    int e;

									    int choose = -1;

									    cout<<"1.入队-------------------2.出队"<<endl;

									    cout<<"3.取头元素---------------4.销毁"<<endl;

									    cout<<"5.输出链队---------------0.退出"<<endl;

									    InitQue(Q);

									    while (choose != 0) {

									        cout << "请选择功能：";

									        cin >> choose;

									        switch (choose) {

									            case 1:

									                cout << "请输入入队元素：";

									                cin >> e;

									                if (EnQue(Q, e))

									                    cout << "入队成功" << endl;

									                break;

									            case 2:

									                if (OutQue(Q, e))

									                    cout << "出队成功" << endl;

									                break;

									            case 3:

									                if (GetHead(Q, e))

									                    cout << "队头元素为" << e << endl;

									                break;

									            case 4:

									                if (DestoryQue(Q))

									                    cout << "销毁成功" << endl;

									                break;

									            case 5:

									                cout << "队列元素为：";

									                ShowList(Q);

									                break;

									        }

									    }

									    return 0;

									}