circular queue (Antrian Melingkar) c++

coding:

#include<cstdlib> #include<iostream> #include<stdlib.h> #define n 3 void INSERT(void); void DELETE(void); void CETAKLAYAR(void); void Inisialisasi(void); void RESET(void); int PIL,F,R,counter,x; char PILIHAN[1],HURUF; char Q[n]; using namespace std; int main() { Inisialisasi(); do { cout<<" ANIMASI QUEUE"<<endl; cout<<" ============="<<endl; cout<<"1. INSERT"<<endl; cout<<"2. DELETE"<<endl; cout<<"3. CETAK QUEUE"<<endl; cout<<"4. QUIT"<<endl; cout<<"PILIHAN"<<endl; cin>>PILIHAN; PIL=atoi(PILIHAN); switch(PIL) { case 1: INSERT(); break; case 2: DELETE(); break; case 3: CETAKLAYAR(); break; } cout<<"TERIMA KASIH"<<endl; system("PAUSE"); system("cls"); } while (PIL<4); return 0; } void INSERT(void) { if (counter<n) { cout<<endl<<"MASUKKAN 1 HURUF:"; cin>>HURUF; Q[++R]=HURUF; HURUF=Q[R]; Q[R]=x; counter++; system("PAUSE"); } else cout<<"Antrian Penuh"<<endl; system("PAUSE"); } void CETAKLAYAR(void) { if(F<R+1) { for(int i=F;i<=R;i++) cout<<"Q["<<i<<"]="<<Q[i]<<endl; system("PAUSE"); } else cout<<"QUEUE Kosong"<<endl; system("PAUSE"); } void DELETE(void) { if(counter>0) { x=Q[F]; F=(F+1)%n; counter--; HURUF=Q[F]; Q[F++]='\0'; cout<<"Data yang diambil:"<<HURUF<<endl; if(F==n) RESET(); system("PAUSE"); } else cout<<"Antrian Kosong"<<endl; system("PAUSE"); } void Inisialisasi(void) { F=0; R=-1; counter=0; } void RESET(void) { F=0; R=-1; counter=0; }