package com.company;

public class Main {

    public static void main(String[] args) {
	// write your code here
        Stos stos = new Stos(10);
        stos.push(2);
        stos.peek();
        stos.push(3);
        stos.push(5);
        stos.peek();
        stos.pop();
        stos.peek();
    }

    public static class Stos{

        private int date[];
        public int top;

        public Stos(int size){
            top = 0;
            date = new int[size];
        }

        public void peek(){ // wyswietlenie pierwszego elementu w stosie
            System.out.println(date[top-1]);
        }

        public void pop(){ // zdjecie z stosu
            if(top>0){
                top--;
            }
            else{
                System.out.println("Stos jest pusty");
            }
        }

        public void push(int a){ // dodanie do stosu
            if(top+1 < date.length) {
                date[top] = a;
                top++;
            }
            else{
                System.out.println("Stos jest pełny");
            }
        }
    }
}