#include <iostream>

using namespace std;

int main()
{
    int *p = new int[10000];
    int *q;
    q = p;

    int n;  //INPUT USER
    int ctr;
    ctr = 0; //penghitung jumlah data

    do
    {
        cout << "\nMenu:\n1. Tambah\n2. Lihat\n3. Ambil\n4. Keluar\n";
        cout << "Pilihan Anda: "; cin  >> n;

        if (n == 1) //TAMBAH
        {
            if (p != NULL)
            {
                cout << "Masukkan bilangan yang mau ditambah: ";

                if (ctr == 0)
                {
                    cin  >> p[ctr];
                    cout << p[ctr] << " berhasil ditambah\n";
                }
                else
                {
                    int tmp = p[ctr - ctr];
                    cin >> p[ctr - ctr];
                    p[ctr] = tmp;
                    cout << p[ctr - ctr] << " berhasil ditambah\n";
                }
                ctr++;
            }
        }

        else if (n == 2) cout << "Bilangan paling depan adalah: " << p[0] << "\n";  //LIHAT

        else if (n == 3)    //AMBIL
        {
            if (p != NULL)
            {
                for (int i = 0; i < ctr; i++)
                {
                    //SWAP
                    int t = p[i];
                    p[i] = p[i+1];
                    p[i+1] = t;
                    //
                }
                ctr -= 1;
            }
        }

    } while (n != 4);

    //delete memory
    delete [] p;
    p = NULL;
    q = NULL;


    return 0;
}