链表实现队列——————数据结构作业

旧城等待， 2022-05-06 12:57 245阅读 0赞

## 作业code2: ##

##### \- 仿照作业code1的功能，将课本上链表的实现队列能完整实现 #####

##### \- 需要通过main函数调用并能进行友好的人机交互输入 #####

[作业code1][code1]

链表实现队列的代码：

#include<bits/stdc++.h>
    #define OK 1
    #define ERROR 0
    using namespace std;
    typedef int QElemType;
    typedef int Status;
    typedef int SElemType;
    typedef struct QNode
    {
        
            QElemType data;
            struct QNode *next;
    }QNode,*QueuePtr;
    typedef struct
    {
        
            QueuePtr front;
            QueuePtr rear;
    }LinkQueue;
    
    LinkQueue q;
    QueuePtr p;
    Status InitQueue(LinkQueue &Q)
    {
        
            Q.front = Q.rear = new QNode;
            Q.front->next = NULL;
            return OK;
    }
    Status EnQueue(LinkQueue &Q,QElemType &e)
    {
        
            p = new QNode;
            p->data = e;
            p->next = NULL;
            Q.rear->next = p;
            Q.rear = p;
            return OK;
    }
    
    Status DeQueue(LinkQueue &Q,QElemType &e)
    {
        
            if(Q.front == Q.rear)
                    return ERROR;
            p = Q.front->next;
            e = p->data;
            Q.front->next = p->next;
            if(Q.rear == p)
                    Q.rear = Q.front;
            delete p;
            return OK;
    }
    
    SElemType GetHead(LinkQueue Q)
    {
        
            if(Q.front != Q.rear)
                    return Q.front->next->data;
    }
    void menu()
    {
        
            printf(
                   "1.入队\n"\
                   "2.出队\n"\
                   "3.取队首\n"\
                   "4.menu\n"
                   "0.退出\n"\
                   );
    }
    
    int main()
    {
        
            menu();
            int e,choose;
            int k=0;
            InitQueue(q);
            while(true)
            {
        
                    cout<<"请输入：";
                    cin>>choose;
                    switch(choose)
                    {
        
                            case 1:
                                    printf("请输入入队元素：");
                                    cin>>e;
                                    EnQueue(q,e);
                                    if(q.front != q.rear)
                                    {
        
                                            printf("队列：");
                                            for(QueuePtr i=q.front->next;i!=q.rear->next;i=i->next)
                                                    printf("%d ",i->data);
                                    }
                                    printf("\n");
                                    break;
                            case 2:
                                    if(q.front == q.rear)
                                            printf("队列为空！\n");
                                    else
                                    {
        
                                            DeQueue(q,e);
                                            printf("出队元素是 %d\n",e);
                                    }
                                    if(q.front != q.rear)
                                    {
        
                                            printf("队列：");
                                            for(QueuePtr i=q.front->next;i!=q.rear->next;i=i->next)
                                                    printf("%d ",i->data);
                                    }
                                    printf("\n");
                                    break;
                            case 3:
                                    e=GetHead(q);
                                    printf("队首元素是：%d\n",e);
                                    break;
                            case 4:
                                    menu();
                                    break;
                            case 0:
                                    k=1;
                                    break;
                    }
                    if(k)   break;
            }
            return 0;
    }

[code1]: https://blog.csdn.net/Hpuer_Random/article/details/83042836