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package day1;

public class MyClass {

    public static void main(String args[]){

        //create object of Stack class
        Stack stack = new Stack();

        //push value into the stack
        stack.push(10);
        stack.push(20);
        stack.push(30);

        //display the stack
        stack.disp();

        //pop value from stack and then display the stack
        System.out.println("\n" + stack.pop() + " pop from stack");
        stack.disp();

        //create object of Queue class
        Queue queue = new Queue();

        //enqueue value into the stack
        queue.enqueue(10);
        queue.enqueue(20);
        queue.enqueue(30);

        //display the queue
        queue.disp();

        //dequeue value from queue and then display the queue
        System.out.println(queue.dequeue() + " dequeue from queue");
        queue.disp();
    }
}


//create stack class
class Stack{
    
    //declare variable
    final int MAX_SIZE = 5;
    int top = -1;
    
    //declare array
    int stackArray[] = new int[MAX_SIZE];

    //push() method
    public void push(int x){

        //check stack is full or not
        if(top == MAX_SIZE-1){
            System.out.println("Stack is overflow");

        }else{
            //assign value into the stack
            stackArray[++top] = x;
        }
    }

    //pop() method
    public int pop(){

        //check stack is empty or not
        if(top < 0){
            
            //if stack is empty, return -1
            return -1;
        }

        //return delete value
        return stackArray[top--];
    }

    //isfull() method
    public void isfull(){
        
        if(top == MAX_SIZE-1){
            System.out.println("Stack is overflow");
        }
    }

    //isempty() method
    public void isempty(){

        if(top < 0){
            System.out.println("Stack is underflow");
        }
    }

    //disp() method
    public void disp(){

        if(top > 0){

            System.out.println("Stack elements are");

            //print the stack
            for(int i = 0; i <= top; i++){
                System.out.println(stackArray[i]);
            }
        }

    }
}



//create Queue class
class Queue{

    //declare variable
    final int MAX_SIZE = 5;
    int f = 0, r = 0;

    //declare array
    int queueArray[] = new int[MAX_SIZE];

    //enqueue() method
    public void enqueue(int x){

        //check queue is full or not
        if(r == MAX_SIZE){
            System.out.println("Queue is overflow");

        }else{

            //assign value into the queue
            queueArray[r++] = x;
        }
    }

    //dequeue() method
    public int dequeue(){

        //check queue is empty or not
        if(f == r){

            //if queue is empty, return -1
            return -1;
        }

        //return delete value
        return queueArray[f++];
    }

    //isfull() method
    public void isfull(){
        
        if(r == MAX_SIZE){
            System.out.println("Queue is overflow");
        }
    }

    //isempty() method
    public void isempty(){

        if(f == r){
            System.out.println("Queue is underflow");
        }
    }

    //disp() method
    public void disp(){

        System.out.println("Queue elements are");

        //print the queue
        for(int i = f; i < r; i++){
            System.out.println(queueArray[i]);
        }
    }
}

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