#include<stdlib.h> #include<iostream> #define TRUE 1 #define FALSE 0 using namespace std; typedef struct LinkQueueNode{ char data; LinkQueueNode *next; }LinkQueueNode; typedef struct CycQueue{ LinkQueueNode *front; LinkQueueNode *rear; int maxLength; int currentLength; }CycQueue; CycQueue *Q=(CycQueue*)malloc(sizeof(CycQueue)); int InitialCycQueue(CycQueue *Q) { LinkQueueNode *QueueHead= (LinkQueueNode*)malloc(sizeof(LinkQueueNode)); if(QueueHead!=NULL){ Q->front=QueueHead; Q->front->next=NULL; Q->rear=Q->front; cout<<"请输入循环队列的大小\n"; cin>>Q->maxLength; Q->currentLength=0; return TRUE; } return FALSE; } //元素进入队尾,队尾指针指向新加入的元素 int EnterCycQueue(CycQueue *Q,char data) { if(Q->currentLength==Q->maxLength){ cout<<"队列已经满了\n"; return FALSE; } LinkQueueNode *newNode=(LinkQueueNode*)malloc(sizeof(LinkQueueNode)); if(newNode==NULL)return FALSE; newNode->data=data; Q->rear->next=newNode; Q->rear=newNode; Q->rear->next=Q->front; Q->currentLength++; return TRUE; } //队首元素出队 int QuitCycQueue(CycQueue *Q) { if(Q->front==Q->rear) { cout<<"队列为空\n"; return FALSE; } LinkQueueNode *p=(LinkQueueNode*)malloc(sizeof(LinkQueueNode)); if(p==NULL)return FALSE; p=Q->front->next; Q->front->next=p->next; Q->currentLength--; free(p); } //获取队首元素值 char GetCycHead(CycQueue *Q) { if(Q->front==Q->rear){ cout<<"队列为空\n"; return FALSE; } return Q->front->next->data; } //初始化队列并添加队列元素 void procInitial() { char data; InitialCycQueue(Q); cout<<"输入队列元素,当输入#时结束\n"; cin>>data; while(data!='#') { if(EnterCycQueue(Q,data)==FALSE)return; //Q->currentLength++; cin>>data; } } int main() { procInitial(); QuitCycQueue(Q); cout<<GetCycHead(Q)<<"\n"; cout<<"当前队列大小"<<Q->currentLength; return 0; }
转载于:https://my.oschina.net/u/1167421/blog/546470
文章来源: https://blog.csdn.net/weixin_33782386/article/details/92080784