Circular Queue

#include<iostream>
#include<cstdlib>
#include<conio.h>
#define n 10
void INSERT(void);
void DELETE(void);
void CETAKLAYAR(void);
void inisialisasi(void);
int PIL,F,R,COUNTER;
char PILIHAN[1],HURUF;
char Q[n];
using namespace std;
int main()
{
    inisialisasi();
    do
    {

        cout<<"                          CIRCULAR QUEUE                             "<<endl;
        cout<<"_____________________________________________________________________"<<endl;
        cout<<" PROGRAM ANIMASI QUEUE                                               "<<endl;
        cout<<"====================================================================="<<endl;
        cout<<" 1.INSERT                                                            "<<endl;
        cout<<" 2.DELETE                                                            "<<endl;
        cout<<" 3.CETAK ANTRIAN                                                     "<<endl;
        cout<<" 4.KELUAR                                                            "<<endl;
        cout<<" * CATATAN : BATAS INPUT = 10 HURUF                                   "<<endl;
        cout<<"_____________________________________________________________________"<<endl;
        cout<<endl;
        cout<<" SILAHKAN MASUKKAN PILIHAN : ";cin>>PILIHAN;
        PIL=atoi(PILIHAN);
        switch(PIL)
        {
            case 1:
                INSERT();
                break;
            case 2:
                DELETE();
                break;
            case 3:
                CETAKLAYAR();
                break;
            default :
            cout<<"TERIMA KASIH"<<endl;
            break;
        }
        cout<<"Press any key to continue"<<endl;
        getch();
        system("cls");
    }
    while (PIL<4);
    return 0;
}

void INSERT(void)
{
    if(COUNTER<n)
    {
        cout<<endl<<"Masukkan 1 huruf : ";
        cin>>HURUF;
        R = (R + 1) % n;
        Q[R] = HURUF;
        COUNTER++;
    }
    else
        cout<<"Antrian Penuh!"<<endl;

}
void CETAKLAYAR(void)
{
    if(COUNTER>0)
    {
        for(int k = 0; k < COUNTER; k++)
        {
            int i = (F+k) % n;
            cout << "Q["<<k<<"]="<<Q[i] << endl;
        }
    }
    else
        cout<<"Queue kosong!"<<endl;

}
void DELETE(void)
{
    if(COUNTER>0)
    {
        HURUF=Q[F];
        F = (F + 1) %n;
        COUNTER--;

        cout<<"Data yang di ambil :"<<HURUF<<endl;
    }
    else
        cout<<"Antrian Kosong!"<<endl;

}
void inisialisasi(void)
{
    F=0;
    R=-1;
    COUNTER=0;
}

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