hackerearth2

1import java.util.*;
2import java.lang.*;
3interface IntNumber 
4{
5    void ins(int item); 
6    int delt();
7}
8
9class HackerEarth implements IntNumber 
10{
11    private int stck[];
12    private int pos;
13
14    HackerEarth(int size)
15    {
16        stck = new int[size];
17        pos = -1;
18    }
19    public void ins(int item) 
20    {
21        if(pos==stck.length-1)  
22            System.out.println("Overflow");
23        else
24            stck[++pos] = item;
25    }
26    
27    public int delt() 
28    {
29        if(pos < 0)
30        {
31            System.out.println("Underflow");
32            return 0;
33        }
34        else
35            return stck[pos--];
36    }
37}
38
39public class Main 
40{
41    public static void main(String args[]) 
42    {
43        HackerEarth obj = new HackerEarth(3);
44        for(int i=0; i<4; i++) obj.ins(i);
45            for(int i=0; i<=3; i++)
46                System.out.println(obj.delt());
47    }
48}