Single Queue

#include <iostream>
#include <stdlib.h>
#define maks 5
using namespace std;

struct antrian{
    int top=-1;
    int bottom=-1;
    char data[maks];
}ant;

bool isempty(){
    if (ant.bottom ==  -1)
    {
        return true;
    }else{
        return false;
    }
}

bool isfull(){
    if(ant.top + 1 == maks)
    {
        return true;
    }else{
        return false;
    }
}

void enqueue(char data){
    if(isfull()){
        cout << "Antrian Penuh.. " << endl;
        system("pause");
    }else{
        if (ant.bottom == -1) {
            ant.bottom = ant.bottom + 1;
        }
        ant.top = ant.top + 1;
        ant.data[ant.top] = data;
    }
}

void dequeue(){
    char data;
    if(isempty()){
        cout << "Antrian kosong" << endl;
        system("pause");
    }else{
        data = ant.data[ant.top];
        cout << "Data " << data << " telah di hapus" << endl;
        if(ant.bottom == ant.top){
            ant.data[ant.bottom] = '\0';
            ant.bottom = ant.bottom - 1;
        }else{
            for (int i = 0; i < ant.top; ++i) {
                ant.data[i] = ant.data[i + 1];
            }
            ant.data[ant.top] = '\0';
        }
        ant.top = ant.top-1;
    }
}

void display(){
    for (int i = 0; i <maks; i++) {
        cout << "[" << ant.data[i] << "] ";
    }
}

int main(){
    char data;
    int menu;

    do{
        system("cls");
        cout << "Top : " << ant.top << endl;
        cout << "Buttom : " << ant.bottom << endl;
        cout << "Isempty ? "<< isempty() <<endl;
        cout << "Isfull ? " << isfull() <<endl;
        cout << "maks ? " << maks <<endl;

        display();
        cout << endl;
        cout << "Menu: "<<endl;
        cout << "1. Tambah(push)"<<endl;
        cout << "2. Hapus(POP)"<<endl;
        cout << "3. Keluar"<<endl;
        cout << "Masukkan menu: ";
        cin >> menu;

        if(menu == 1){
            cout << "Masukkan data : ";
            cin >>data;
            enqueue(data);
        }else{
            dequeue();
        }
    }while(menu != 3);


}