#include<iostream>
#include<string.h>
#include<stdlib.h>
using namespace std;
#define OK 1
#define ERROR 0;
#define OVERFLOW -1
typedef int Status;
#define MAXSIZE 100
typedef struct{
char *base;
int front;
int rear;
}SqQueue;
Status InitQueue(SqQueue &Q){
Q.base=new char[MAXSIZE];
if(Q.base==NULL)
exit(OVERFLOW);
Q.front=Q.rear=0;
return OK;
}
int QueueLength(SqQueue Q){
return (Q.rear-Q.front+MAXSIZE)%MAXSIZE;
}
Status EnQueue(SqQueue &Q,char e){
if((Q.rear+1)%MAXSIZE==Q.front)
return ERROR;
Q.base[Q.rear]=e;
Q.rear=(Q.rear+1)%MAXSIZE;
return OK;
}
Status DeQueue(SqQueue &Q,char &e){
if(Q.rear==Q.front)
return ERROR;
e=Q.base[Q.front];
Q.front=(Q.front+1)%MAXSIZE;
return OK;
}
char GetHead(SqQueue Q){
if(Q.front!=Q.rear)
return Q.base[Q.front];
}
int main(){
SqQueue Q;
while(1){
int option=0;
char str;
system("cls");
cout<<"循环队列——队列的顺序表示和实现"<<endl;
cout<<"1.循环队列的初始化"<<endl;
cout<<"2.循环队列的入队"<<endl;
cout<<"3.循环队列的出队"<<endl;
cout<<"4.取出循环队列的头元素"<<endl;
cout<<"5.退出"<<endl;
cout<<"Please input your select:";
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 a char:";
cin>>str;
if(EnQueue(Q,str)==OK)
cout<<"2.Success!"<<endl;
else
cout<<"2.Error!"<<endl;
system("pause");
break;
case 3:
if(DeQueue(Q,str)==OK){
cout<<"3.Success!"<<endl;
cout<<"The char is "<<str<<endl;
}
else
cout<<"3.Error!"<<endl;
system("pause");
break;
case 4:
str=GetHead(Q);
cout<<"4.Success!"<<endl;
cout<<"4.The head char is "<<str<<endl;
system("pause");
break;
case 0:
exit(0);
break;
default:
cout<<"Warming!"<<endl;
break;
}
}
return 0;
}