Membuat Codingan C++ Struct Queue

#include <iostream>
#define MAX 20

using namespace std;

struct queue{
int front, rear, data[MAX];

}q;

bool isFull(){
return q.rear == MAX;
}

bool isEmpty(){
return q.rear == 0;
}

void printqueue(){
if(isEmpty()){
cout<<"antrian kosong gaess"<<endl;

}else{
cout<<"queue :";
for(int i= q.front; i<q.rear; i++){
cout<<q.data[i]<<((q.front - 1 == i)? "" : ",");

}
}
}
void enqueue(){
if(isFull()){
cout<<"antrian udah penuh nih!!"<<endl;
}else{
int data;
cout<<"masukkan data:";
cin>>data;
q.data[q.rear]= data;
q.rear++;
cout<<"data telah di tambahkan !";
printqueue();
}
}
void dequeue(){
if(isEmpty()){
cout<<"antrian kosong"<<endl;
}else{
cout<<"mengambil data\""<<q.data[q.front]<<"\"..."<<endl;
for(int i=q.front; i<q.rear; i++){
q.data[i]=q.data[i+1];

}
q.rear--;
printqueue();

}
}
int main(){
int pilih;
do{
cout<<"\nMenu pilihan\n";
cout<<"1. enqueue\n";
cout<<"2. dequeue\n";
cout<<"3. keluar\n";
cout<<"masukkan pilihan anda :";
cin>>pilih;

switch(pilih){
case 1:
enqueue();
break;
case 2:
dequeue();
break;
default:
cout<<"exit";
break;
}
}
while(pilih != 3);
return 0;
}