DSA-practice-java/DSA-lab3(a)-stack at main · charull44/DSA-practice-java · GitHub

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import java.util.*;
public class Main {
    public final int max=4;
    public int[] arr = new int[max];
    public int tos=-1;

    public void push (int data){
        if (tos==max-1){
            System.out.println("overflow");
            return; }
        tos++;
        arr[tos]=data;
         System.out.println("Push="+data);
    }

    public void pop(){
        if (tos==-1){
            System.out.println("underflow");
            return;}

        int popd=arr[tos];
        tos--;
        System.out.println("Pop="+popd);
            return;
    }
    public static void main(String[] args) {
        Main stack=new Main();
        stack.push(10);
        stack.push(20);
        stack.push(10);
        stack.push(10);
        stack.push(50);
        stack.push(100);
        stack.pop();
        stack.pop();
        stack.pop();
        stack.pop();
        stack.pop();

    }
}