DAA 1 B - IMPLEMENT STACK USING ARRAYS

1 B - Write a Java program to implement the Stack using arrays.Write Push(), Pop(), and Display() methods to demonstrate its working.

import java.util.Scanner;
public class lab1b 
{
final int max=5;
int s[]=new int[max];
int top=-1;
void push(int ele)
{
if(top>=max-1)
System.out.println("stack overflow");
else
s[++top]=ele;
}
int pop()
{
int z=0;
if(top==-1)
System.out.println("stack underflow");
else
z=s[top--];
return z;
}
void display()
{
if(top==-1)
System.out.println("stack empty");
else
{
for(int i=top;i>-1;i--)
System.out.println(s[i]+" ");
}
}

public static void main(String args[])
{
int q=1;
lab1b m = new lab1b();
System.out.println("program to perform stack operations");
Scanner sc=new Scanner(System.in);
while(q!=0)
{
System.out.println("1. push 2.pop 3. display 4.Exit");
System.out.println("Enter your choice");
int ch=sc.nextInt();
switch(ch)
{
case 1:
System.out.println("enter the element to be pushed");
int ele=sc.nextInt();
m.push(ele);
break;
case 2:
int popele;
popele=m.pop();
System.out.println("the poped element is");
System.out.println(popele+" ");
break;
case 3:
System.out.println("elements in the stack are");
m.display();
break;
case 4:
q=0;
}
}
}

}

OUTPUT : (click on image to zoom)