Program Queue

#include <iostream>
#define maks 5

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

using namespace std;

class Queue{
 friend ostream&operator<<(ostream&,const Queue&);
 public:
  Queue();
  int penuh(int);
  int kosong (int);
  void cetak();
  void enqueue(char x);
  char dequeue();
 private:
  char A[maks];
  int banyak;
};

ostream&operator<<(ostream&out,const Queue& s){
 cout<<"\nIsi Queue :";
 for(int i=0;i<s.banyak;i++)
 out<<s.A[i]<<" ";

}

Queue::Queue(){

 banyak=0;
 for(int i=0;i<maks;i++)
 A[i]='0';

}

int Queue::penuh(int s){

 return s==maks ? 1:0;
}

int Queue::kosong(int s){

 return s==0?1:0;
}
void Queue::cetak(){
 cout<<"\nIsi Queue: ";
 for(int i=0;i<banyak;i++)
 cout<<A[i]<<" ";
}
void Queue::enqueue(char x){
 cout<<"\n element: "<<x<<" masuk antrian";
 if(penuh(banyak))cout<<"queue penuh";
 else if(A[0]=='0'){
 
  A[0]=x;
  banyak++;
 }
 else {
  for (int i=banyak;i>=0;i--)
  A[i+1]=A[i];
  A[0]=x;
  banyak++;
 }
}

char Queue::dequeue(){

 char temp=A[--banyak];
 cout<<"\nDequeue elemen-->"<<temp;
 A[banyak]='0';
 return temp;
}

int main() {
Queue q;
for (char c='a';c<'d';c++){
 q.enqueue(c);
 cout<<q;
}
char p =q.dequeue();
  q.cetak();
 cout<<"\n\nCetak paakai overloading: "<<q;
 return 0;
}