#include<iostream>
#include<string.h>
#include<stdlib.h>
using namespace std;
#define OK 1
#define ERROR 0
#define OVERFLOW -1
typedef int Status;
typedef struct QNode{
char data;
struct QNode *next;
}QNode,*QueuePtr;
typedef struct{
QueuePtr front;
QueuePtr rear;
}LinkQueue;
Status InitQueue(LinkQueue &Q){
Q.front=Q.rear=new QNode;
Q.front->next=NULL;
return OK;
}
Status EnQueue(LinkQueue &Q,char e){
QueuePtr p=new QNode;
p->data=e;
p->next=NULL;
Q.rear->next=p;
Q.rear=p;
return OK;
}
Status DeQueue(LinkQueue &Q,char &e){
if(Q.front==Q.rear)
return ERROR;
QueuePtr p;
p=Q.front->next;
e=p->data;
Q.front->next=p->next;
if(Q.rear==p)
Q.rear=Q.front;
delete p;
return OK;
}
char GetHead(LinkQueue Q){
if(Q.front!=Q.rear)
return Q.front->next->data;
}
int main(){
LinkQueue Q;
while(1){
int option=0;
char str;
system("cls");
cout<<"链队的表示与实现"<<endl;
cout<<"1.链队的初始化"<<endl;
cout<<"2.链队的入队"<<endl;
cout<<"3.链队的出队"<<endl;
cout<<"4.取出队头元素"<<endl;
cout<<"0.退出"<<endl;
cout<<"请输入你的选择:";
cin>>option;
switch(option){
case 1:
if(InitQueue(Q)==OK)
cout<<"1.Success!"<<endl;
else
cout<<"1.Error!"<<endl;
system("pause");
break;
case 2:
cout<<"Plesea input str:";
cin>>str;
if(EnQueue(Q,str)==OK)
cout<<"2."<<str<<" input successly!"<<endl;
else
cout<<"2.Error!"<<endl;
system("pause");
break;
case 3:
if(DeQueue(Q,str)==OK){
cout<<"3.出队成功!"<<endl;
cout<<"The str is "<<str<<endl;
}
else
cout<<"3.Error!"<<endl;
system("pause");
break;
case 4:
str=GetHead(Q);
cout<<"当前队头元素是:"<<str<<endl;
system("pause");
break;
case 0:
exit(0);
break;
default:
cout<<"Your Input Is Wrong!"<<endl;
system("pause");
break;
}
}
return 0;
}