import java.io.*;
public class stack2 {
public static void main(String [] args) throws IOException{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int ar [] = new int[10];
int top = -1;
System.out.print("Angka yang dimasukkan ke stack : "); //memasukkan angka ke stack
int angka = Integer.parseInt(br.readLine());
System.out.println();
boolean isEmpty;
if(top == -1) isEmpty = true; // Memeriksa stack apakah kosong
else isEmpty = false;
boolean isFull;
if(top == ar.length) isFull = true; // Memeriksa stack apakah penuh
else isFull = false;
// PUSH
if(isFull == !true){
top++; // top dinaikin
ar[top] = angka;
System.out.println("angka "+angka+" berhasil di input"); }
else System.out.println("Stack penuh");
// Menampilkan isi stack
System.out.print("isi stack adalah ");
for (int i = 0; i <= top; i++) {
System.out.print( ar[i] + " "); }
System.out.println();
// POP
if(isEmpty == true){
int indexPop = top; //Menghapus index paling atas (pop)
top--; //top diturunin
System.out.println("stack index "+indexPop+" (angka "+ar[top+1]+")"+" berhasil di pop"); }
else System.out.println("Stack kosong");
// Menampilkan isi stack
if(isEmpty == !true){
System.out.print("isi stack adalah :");
for (int i = 0; i <= top; i++) {
System.out.print( ar[i] + " "); } }
else System.out.println("isi stack adalah : kosong"); }}