Delete all even elements from a stack

Here given code implementation process.

// C program 
// Delete all even elements from a stack
#include <stdio.h>
#include <stdlib.h>

// Define stack node
struct StackNode
{
	int element;
	struct StackNode *next;
};
// Define a custom stack
struct MyStack
{
	struct StackNode *top;
	int size;
};
struct MyStack *newStack()
{
	//Make a stack
	struct MyStack *stack = (struct MyStack *) malloc(sizeof(struct MyStack));
	if (stack != NULL)
	{
		//Set node values
		stack->top = NULL;
		stack->size = 0;
	}
	else
	{
		printf("\nMemory overflow when create new stack\n");
	}
}
//Create a new node of stack
struct StackNode *newNode(int element, struct StackNode *next)
{
	//Make a new node
	struct StackNode *node = (struct StackNode *) malloc(sizeof(struct StackNode));
	if (node == NULL)
	{
		printf("\nMemory overflow when create new stack Node \n");
	}
	else
	{
		node->element = element;
		node->next = next;
	}
	return node;
}
// Returns the status of empty or non empty stacks
int isEmpty(struct MyStack *stack)
{
	if (stack->size > 0 && stack->top != NULL)
	{
		return 0;
	}
	else
	{
		return 1;
	}
}
// Add node at the top of stack
void push(struct MyStack *stack, int element)
{
	// Add stack element
	stack->top = newNode(element, stack->top);
	stack->size++;
}
// return top element of stack
int peek(struct MyStack *stack)
{
	return stack->top->element;
}
// Remove top element of stack
void pop(struct MyStack *stack)
{
	if (isEmpty(stack) == 0)
	{
		struct StackNode *temp = stack->top;
		// Change top element of stack
		stack->top = temp->next;
		// remove previous top
		free(temp);
		temp = NULL;
		stack->size--;
	}
}
// Remove Even element of stack
void deleteEven(struct MyStack *stack)
{
	if (isEmpty(stack) == 0)
	{
		// When stack not empty 
		// Get top element
		int element = peek(stack);
		// Remove top element
		pop(stack);
		deleteEven(stack);
		if (element % 2 != 0)
		{
			// Add odd element in stack
			push(stack, element);
		}
	}
}
// Print element of stack
void printData(struct MyStack *stack)
{
	struct StackNode *temp = stack->top;
	// iterate stack elements
	while (temp != NULL)
	{
		// Display element value
		printf("  %d", temp->element);
		temp = temp->next;
	}
	printf("\n");
}
int main()
{
	struct MyStack *stack = newStack();
	// Add the stack element
	push(stack, 17);
	push(stack, 6);
	push(stack, 5);
	push(stack, 14);
	push(stack, 9);
	push(stack, 12);
	push(stack, 14);
	/*
	Created Stack
	============

	    14 <- Top
	    12
	    9
	    14
	    5
	    6
	    17
	*/
	printf("\n  Stack element \n");
	printData(stack);
	// delete operation
	deleteEven(stack);
	/*
	After delete even key element
	============

	    9 <- Top
	    5
	    17
	*/
	printf("\n  After delete even node in stack \n");
	printData(stack);
	return 0;
}

Output

  Stack element
  14  12  9  14  5  6  17

  After delete even node in stack
  9  5  17
/*
   Java Program
   Delete all even elements from a stack
*/
// Define stack node
class StackNode
{
    public int element;
    public StackNode next;
    public StackNode(int element, StackNode next)
    {
        this.element = element;
        this.next = next;
    }
}
// Define a custom stack
class MyStack
{
    public StackNode top;
    public int size;
    public MyStack()
    {
        //Set node values
        this.top = null;
        this.size = 0;
    }
    // Add node at the top of stack
    public void push(int element)
    {
        this.top = new StackNode(element, this.top);
        this.size++;
    }
    public boolean isEmpty()
    {
        if (this.size > 0 && this.top != null)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    // Remove top element of stack
    public void pop()
    {
        if (this.size > 0 && this.top != null)
        {
            StackNode temp = this.top;
            // Change top element of stack
            this.top = temp.next;
            // remove previous top
            temp = null;
            this.size--;
        }
    }
    // return top element of stack
    public int peek()
    {
        return this.top.element;
    }
}
public class DeleteElement
{
    public MyStack stack;
    public DeleteElement()
    {
        this.stack = new MyStack();
    }
    // Print element of stack
    public void printData()
    {
        StackNode temp = this.stack.top;
        while (temp != null)
        {
            // Display element value
            System.out.print("   " + temp.element);
            temp = temp.next;
        }
        System.out.print("\n");
    }
    // Remove Even element of stack
    public void deleteEven()
    {
        if (this.stack.isEmpty() == false)
        {
            // When stack not empty 
            // Get top element
            int element = this.stack.peek();
            // Remove top element
            this.stack.pop();

            this.deleteEven();

            if (element % 2 != 0)
            {
                // Add odd element in stack
                this.stack.push(element);
            }
        }
    }
    public static void main(String[] args)
    {
        DeleteElement task = new DeleteElement();
        // Add the stack element
        task.stack.push(17);
        task.stack.push(6);
        task.stack.push(5);
        task.stack.push(14);
        task.stack.push(9);
        task.stack.push(12);
        task.stack.push(14);
        /*
        Created Stack
        ============

            14 <- Top
            12
            9
            14
            5
            6
            17
        */
        System.out.print("\n   Stack element \n");
        task.printData();
        // delete operation
        task.deleteEven();
        /*
        After delete even key element
        ============

            9 <- Top
            5
            17
        */
        System.out.print("\n   After delete even node in stack \n");
        task.printData();
    }
}

Output

   Stack element
   14   12   9   14   5   6   17

   After delete even node in stack
   9   5   17
// Include header file
#include <iostream>
using namespace std;

/*
   C++ Program
   Delete all even elements from a stack
*/

// Define stack node
class StackNode
{
    public: int element;
    StackNode *next;
    StackNode(int element, StackNode *next)
    {
        this->element = element;
        this->next = next;
    }
};
// Define a custom stack
class MyStack
{
    public: StackNode *top;
    int size;
    MyStack()
    {
        //Set node values
        this->top = NULL;
        this->size = 0;
    }
    // Add node at the top of stack
    void push(int element)
    {
        this->top = new StackNode(element, this->top);
        this->size++;
    }
    bool isEmpty()
    {
        if (this->size > 0 && this->top != NULL)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    // Remove top element of stack
    void pop()
    {
        if (this->size > 0 && this->top != NULL)
        {
            StackNode *temp = this->top;
            // Change top element of stack
            this->top = temp->next;
            // remove previous top
            delete temp;
            temp = NULL;
            this->size--;
        }
    }
    // return top element of stack
    int peek()
    {
        return this->top->element;
    }
};
class DeleteElement
{
    public: MyStack stack;
    DeleteElement()
    {
        this->stack = MyStack();
    }
    // Print element of stack
    void printData()
    {
        StackNode *temp = this->stack.top;
        while (temp != NULL)
        {
            // Display element value
            cout << "   " << temp->element;
            temp = temp->next;
        }
        cout << "\n";
    }
    // Remove Even element of stack
    void deleteEven()
    {
        if (this->stack.isEmpty() == false)
        {
            // When stack not empty
            // Get top element
            int element = this->stack.peek();
            // Remove top element
            this->stack.pop();
          
            this->deleteEven();
          
            if (element % 2 != 0)
            {
                // Add odd element in stack
                this->stack.push(element);
            }
        }
    }
};
int main()
{
    DeleteElement task = DeleteElement();
    // Add the stack element
    task.stack.push(17);
    task.stack.push(6);
    task.stack.push(5);
    task.stack.push(14);
    task.stack.push(9);
    task.stack.push(12);
    task.stack.push(14);
    /*
    Created Stack
    ============

        14 <- Top
        12
        9
        14
        5
        6
        17
    */
    cout << "\n   Stack element \n";
    task.printData();
    // delete operation
    task.deleteEven();
    /*
    After delete even key element
    ============

        9 <- Top
        5
        17
    */
    cout << "\n   After delete even node in stack \n";
    task.printData();
    return 0;
}

Output

   Stack element
   14   12   9   14   5   6   17

   After delete even node in stack
   9   5   17
// Include namespace system
using System;
/*
   C# Program
   Delete all even elements from a stack
*/
// Define stack node
public class StackNode
{
    public int element;
    public StackNode next;
    public StackNode(int element, StackNode next)
    {
        this.element = element;
        this.next = next;
    }
}
// Define a custom stack
public class MyStack
{
    public StackNode top;
    public int size;
    public MyStack()
    {
        //Set node values
        this.top = null;
        this.size = 0;
    }
    // Add node at the top of stack
    public void push(int element)
    {
        this.top = new StackNode(element, this.top);
        this.size++;
    }
    public Boolean isEmpty()
    {
        if (this.size > 0 && this.top != null)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    // Remove top element of stack
    public void pop()
    {
        if (this.size > 0 && this.top != null)
        {
            StackNode temp = this.top;
            // Change top element of stack
            this.top = temp.next;
            // remove previous top
            temp = null;
            this.size--;
        }
    }
    // return top element of stack
    public int peek()
    {
        return this.top.element;
    }
}
public class DeleteElement
{
    public MyStack stack;
    public DeleteElement()
    {
        this.stack = new MyStack();
    }
    // Print element of stack
    public void printData()
    {
        StackNode temp = this.stack.top;
        while (temp != null)
        {
            // Display element value
            Console.Write("   " + temp.element);
            temp = temp.next;
        }
        Console.Write("\n");
    }
    // Remove Even element of stack
    public void deleteEven()
    {
        if (this.stack.isEmpty() == false)
        {
            // When stack not empty
            // Get top element
            int element = this.stack.peek();
            // Remove top element
            this.stack.pop();
            this.deleteEven();
            if (element % 2 != 0)
            {
                // Add odd element in stack
                this.stack.push(element);
            }
        }
    }
    public static void Main(String[] args)
    {
        DeleteElement task = new DeleteElement();
        // Add the stack element
        task.stack.push(17);
        task.stack.push(6);
        task.stack.push(5);
        task.stack.push(14);
        task.stack.push(9);
        task.stack.push(12);
        task.stack.push(14);
        /*
        Created Stack
        ============

            14 <- Top
            12
            9
            14
            5
            6
            17
        */
        Console.Write("\n   Stack element \n");
        task.printData();
        // delete operation
        task.deleteEven();
        /*
        After delete even key element
        ============

            9 <- Top
            5
            17
        */
        Console.Write("\n   After delete even node in stack \n");
        task.printData();
    }
}

Output

   Stack element
   14   12   9   14   5   6   17

   After delete even node in stack
   9   5   17
<?php
/*
   Php Program
   Delete all even elements from a stack
*/
// Define stack node
class StackNode
{
    public $element;
    public $next;

    function __construct($element, $next)
    {
        $this->element = $element;
        $this->next = $next;
    }
}
// Define a custom stack
class MyStack
{
    public $top;
    public $size;

    function __construct()
    {
        //Set node values
        $this->top = null;
        $this->size = 0;
    }
    // Add node at the top of stack
    public  function push($element)
    {
        $this->top = new StackNode($element, $this->top);
        $this->size++;
    }
    public  function isEmpty()
    {
        if ($this->size > 0 && $this->top != null)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    // Remove top element of stack
    public  function pop()
    {
        if ($this->size > 0 && $this->top != null)
        {
            $temp = $this->top;
            // Change top element of stack
            $this->top = $temp->next;
            // remove previous top
            $temp = null;
            $this->size--;
        }
    }
    // return top element of stack
    public  function peek()
    {
        return $this->top->element;
    }
}
class DeleteElement
{
    public $stack;

    function __construct()
    {
        $this->stack = new MyStack();
    }
    // Print element of stack
    public  function printData()
    {
        $temp = $this->stack->top;
        while ($temp != null)
        {
            // Display element value
            echo "   ". $temp->element;
            $temp = $temp->next;
        }
        echo "\n";
    }
    // Remove Even element of stack
    public  function deleteEven()
    {
        if ($this->stack->isEmpty() == false)
        {
            // When stack not empty
            // Get top element
            $element = $this->stack->peek();
            // Remove top element
            $this->stack->pop();
            $this->deleteEven();
            if ($element % 2 != 0)
            {
                // Add odd element in stack
                $this->stack->push($element);
            }
        }
    }
}

function main()
{
    $task = new DeleteElement();
    // Add the stack element
    $task->stack->push(17);
    $task->stack->push(6);
    $task->stack->push(5);
    $task->stack->push(14);
    $task->stack->push(9);
    $task->stack->push(12);
    $task->stack->push(14);
    /*
    Created Stack
    ============

        14 <- Top
        12
        9
        14
        5
        6
        17
    */
    echo "\n   Stack element \n";
    $task->printData();
    // delete operation
    $task->deleteEven();
    /*
    After delete even key element
    ============

        9 <- Top
        5
        17
    */
    echo "\n   After delete even node in stack \n";
    $task->printData();
}
main();

Output

   Stack element
   14   12   9   14   5   6   17

   After delete even node in stack
   9   5   17
/*
   Node Js Program
   Delete all even elements from a stack
*/
// Define stack node
class StackNode
{
    constructor(element, next)
    {
        this.element = element;
        this.next = next;
    }
}
// Define a custom stack
class MyStack
{
    constructor()
    {
        //Set node values
        this.top = null;
        this.size = 0;
    }
    // Add node at the top of stack
    push(element)
    {
        this.top = new StackNode(element, this.top);
        this.size++;
    }
    isEmpty()
    {
        if (this.size > 0 && this.top != null)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    // Remove top element of stack
    pop()
    {
        if (this.size > 0 && this.top != null)
        {
            var temp = this.top;
            // Change top element of stack
            this.top = temp.next;
            // remove previous top
            temp = null;
            this.size--;
        }
    }
    // return top element of stack
    peek()
    {
        return this.top.element;
    }
}
class DeleteElement
{
    constructor()
    {
        this.stack = new MyStack();
    }
    // Print element of stack
    printData()
    {
        var temp = this.stack.top;
        while (temp != null)
        {
            // Display element value
            process.stdout.write("   " + temp.element);
            temp = temp.next;
        }
        process.stdout.write("\n");
    }
    // Remove Even element of stack
    deleteEven()
    {
        if (this.stack.isEmpty() == false)
        {
            // When stack not empty
            // Get top element
            var element = this.stack.peek();
            // Remove top element
            this.stack.pop();
            this.deleteEven();
            if (element % 2 != 0)
            {
                // Add odd element in stack
                this.stack.push(element);
            }
        }
    }
}

function main()
{
    var task = new DeleteElement();
    // Add the stack element
    task.stack.push(17);
    task.stack.push(6);
    task.stack.push(5);
    task.stack.push(14);
    task.stack.push(9);
    task.stack.push(12);
    task.stack.push(14);
    /*
    Created Stack
    ============

        14 <- Top
        12
        9
        14
        5
        6
        17
    */
    process.stdout.write("\n   Stack element \n");
    task.printData();
    // delete operation
    task.deleteEven();
    /*
    After delete even key element
    ============

        9 <- Top
        5
        17
    */
    process.stdout.write("\n   After delete even node in stack \n");
    task.printData();
}
main();

Output

   Stack element
   14   12   9   14   5   6   17

   After delete even node in stack
   9   5   17
#    Python 3 Program
#    Delete all even elements from a stack

#  Define stack node
class StackNode :
	
	def __init__(self, element, next) :
		self.element = element
		self.next = next
	

#  Define a custom stack
class MyStack :
	
	def __init__(self) :
		# Set node values
		self.top = None
		self.size = 0
	
	#  Add node at the top of stack
	def push(self, element) :
		self.top = StackNode(element, self.top)
		self.size += 1
	
	def isEmpty(self) :
		if (self.size > 0 and self.top != None) :
			return False
		else :
			return True
		
	
	#  Remove top element of stack
	def pop(self) :
		if (self.size > 0 and self.top != None) :
			temp = self.top
			#  Change top element of stack
			self.top = temp.next
			#  remove previous top
			temp = None
			self.size -= 1
		
	
	#  return top element of stack
	def peek(self) :
		return self.top.element
	

class DeleteElement :
	
	def __init__(self) :
		self.stack = MyStack()
	
	#  Print element of stack
	def printData(self) :
		temp = self.stack.top
		while (temp != None) :
			#  Display element value
			print("   ", temp.element, end = "")
			temp = temp.next
		
		print(end = "\n")
	
	#  Remove Even element of stack
	def deleteEven(self) :
		if (self.stack.isEmpty() == False) :
			#  When stack not empty 
			#  Get top element
			element = self.stack.peek()
			#  Remove top element
			self.stack.pop()
			self.deleteEven()
			if (element % 2 != 0) :
				#  Add odd element in stack
				self.stack.push(element)
			
		
	

def main() :
	task = DeleteElement()
	task.stack.push(17)
	task.stack.push(6)
	task.stack.push(5)
	task.stack.push(14)
	task.stack.push(9)
	task.stack.push(12)
	task.stack.push(14)
	# 
	#         Created Stack
	#         ============
	#             14 <- Top
	#             12
	#             9
	#             14
	#             5
	#             6
	#             17
	#         
	
	print("\n   Stack element ")
	task.printData()
	#  delete operation
	task.deleteEven()
	# 
	#         After delete even key element
	#         ============
	#             9 <- Top
	#             5
	#             17
	#         
	
	print("\n   After delete even node in stack ")
	task.printData()

if __name__ == "__main__": main()

Output

   Stack element
    14    12    9    14    5    6    17

   After delete even node in stack
    9    5    17
#  Ruby Program
#  Delete all even elements from a stack

#  Define stack node
class StackNode  
	# Define the accessor and reader of class StackNode  
	attr_reader :element, :next
	attr_accessor :element, :next
 
	
	def initialize(element, top) 
		self.element = element
		self.next = top
	end

end

#  Define a custom stack
class MyStack  
	# Define the accessor and reader of class MyStack  
	attr_reader :top, :size
	attr_accessor :top, :size
 
	
	def initialize() 
		# Set node values
		self.top = nil
		self.size = 0
	end

	#  Add node at the top of stack
	def push(element) 
		self.top = StackNode.new(element, self.top)
		self.size += 1
	end

	def isEmpty() 
		if (self.size > 0 && self.top != nil) 
			return false
		else 
			return true
		end

	end

	#  Remove top element of stack
	def pop() 
		if (self.size > 0 && self.top != nil) 
			temp = self.top
			#  Change top element of stack
			self.top = temp.next
			#  remove previous top
			temp = nil
			self.size -= 1
		end

	end

	#  return top element of stack
	def peek() 
		return self.top.element
	end

end

class DeleteElement  
	# Define the accessor and reader of class DeleteElement  
	attr_reader :stack
	attr_accessor :stack
 
	
	def initialize() 
		self.stack = MyStack.new()
	end

	#  Print element of stack
	def printData() 
		temp = self.stack.top
		while (temp != nil) 
			#  Display element value
			print("   ", temp.element)
			temp = temp.next
		end

		print("\n")
	end

	#  Remove Even element of stack
	def deleteEven() 
		if (self.stack.isEmpty() == false) 
			#  When stack not empty 
			#  Get top element
			element = self.stack.peek()
			#  Remove top element
			self.stack.pop()
			self.deleteEven()
			if (element % 2 != 0) 
				#  Add odd element in stack
				self.stack.push(element)
			end

		end

	end

end

def main() 
	task = DeleteElement.new()
	task.stack.push(17)
	task.stack.push(6)
	task.stack.push(5)
	task.stack.push(14)
	task.stack.push(9)
	task.stack.push(12)
	task.stack.push(14)
	# 
	#         Created Stack
	#         ============
	#             14 <- Top
	#             12
	#             9
	#             14
	#             5
	#             6
	#             17
	#         
	
	print("\n   Stack element \n")
	task.printData()
	#  delete operation
	task.deleteEven()
	# 
	#         After delete even key element
	#         ============
	#             9 <- Top
	#             5
	#             17
	#         
	
	print("\n   After delete even node in stack \n")
	task.printData()
end

main()

Output

   Stack element 
   14   12   9   14   5   6   17

   After delete even node in stack 
   9   5   17
/*
   Scala Program
   Delete all even elements from a stack
*/
// Define stack node
class StackNode(var element: Int , var next: StackNode);

// Define a custom stack
class MyStack(var top: StackNode , var size: Int)
{
    def this()
    {
        this(null, 0);
    }
    // Add node at the top of stack
    def push(element: Int): Unit = {
        this.top = new StackNode(element, this.top);
        this.size += 1;
    }
    def isEmpty(): Boolean = {
        if (this.size > 0 && this.top != null)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    // Remove top element of stack
    def pop(): Unit = {
        if (this.size > 0 && this.top != null)
        {
            var temp: StackNode = this.top;
            // Change top element of stack
            this.top = temp.next;
            // remove previous top
            temp = null;
            this.size -= 1;
        }
    }
    // return top element of stack
    def peek(): Int = {
        return this.top.element;
    }
}
class DeleteElement(var stack: MyStack)
{
    def this()
    {
        this(new MyStack());
    }
    // Print element of stack
    def printData(): Unit = {
        var temp: StackNode = this.stack.top;
        while (temp != null)
        {
            // Display element value
            print("   " + temp.element);
            temp = temp.next;
        }
        print("\n");
    }
    // Remove Even element of stack
    def deleteEven(): Unit = {
        if (this.stack.isEmpty() == false)
        {
            // When stack not empty
            // Get top element
            var element: Int = this.stack.peek();
            // Remove top element
            this.stack.pop();
            this.deleteEven();
            if (element % 2 != 0)
            {
                // Add odd element in stack
                this.stack.push(element);
            }
        }
    }
}
object Main
{
    def main(args: Array[String]): Unit = {
        var task: DeleteElement = new DeleteElement();
        // Add the stack element
        task.stack.push(17);
        task.stack.push(6);
        task.stack.push(5);
        task.stack.push(14);
        task.stack.push(9);
        task.stack.push(12);
        task.stack.push(14);
        /*
        Created Stack
        ============

            14 <- Top
            12
            9
            14
            5
            6
            17
        */
        print("\n   Stack element \n");
        task.printData();
        // delete operation
        task.deleteEven();
        /*
        After delete even key element
        ============

            9 <- Top
            5
            17
        */
        print("\n   After delete even node in stack \n");
        task.printData();
    }
}

Output

   Stack element
   14   12   9   14   5   6   17

   After delete even node in stack
   9   5   17
/*
   Swift 4 Program
   Delete all even elements from a stack
*/
// Define stack node
class StackNode
{
    var element: Int;
    var next: StackNode? ;
    init(_ element: Int, _ next: StackNode? )
    {
        self.element = element;
        self.next = next;
    }
}
// Define a custom stack
class MyStack
{
    var top: StackNode? ;
    var size: Int;
    init()
    {
        //Set node values
        self.top = nil;
        self.size = 0;
    }
    // Add node at the top of stack
    func push(_ element: Int)
    {
        self.top = StackNode(element, self.top);
        self.size += 1;
    }
    func isEmpty()->Bool
    {
        if (self.size > 0 && self.top != nil)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    // Remove top element of stack
    func pop()
    {
        if (self.size > 0 && self.top != nil)
        {
            var temp: StackNode? = self.top;
            // Change top element of stack
            self.top = temp!.next;
            // remove previous top
            temp = nil;
            self.size -= 1;
        }
    }
    // return top element of stack
    func peek()->Int
    {
        return self.top!.element;
    }
}
class DeleteElement
{
    var stack: MyStack;
    init()
    {
        self.stack = MyStack();
    }
    // Print element of stack
    func printData()
    {
        var temp: StackNode? = self.stack.top;
        while (temp != nil)
        {
            // Display element value
            print("   ", temp!.element, terminator: "");
            temp = temp!.next;
        }
        print(terminator: "\n");
    }
    // Remove Even element of stack
    func deleteEven()
    {
        if (self.stack.isEmpty() == false)
        {
            // When stack not empty
            // Get top element
            let element: Int = self.stack.peek();
            // Remove top element
            self.stack.pop();
            self.deleteEven();
            if (element % 2 != 0)
            {
                // Add odd element in stack
                self.stack.push(element);
            }
        }
    }
}
func main()
{
    let task: DeleteElement = DeleteElement();
    // Add the stack element
    task.stack.push(17);
    task.stack.push(6);
    task.stack.push(5);
    task.stack.push(14);
    task.stack.push(9);
    task.stack.push(12);
    task.stack.push(14);
    /*
    Created Stack
    ============

        14 <- Top
        12
        9
        14
        5
        6
        17
    */
    print("\n   Stack element ");
    task.printData();
    // delete operation
    task.deleteEven();
    /*
    After delete even key element
    ============

        9 <- Top
        5
        17
    */
    print("\n   After delete even node in stack ");
    task.printData();
}
main();

Output

   Stack element
    14    12    9    14    5    6    17

   After delete even node in stack
    9    5    17
/*
   Kotlin Program
   Delete all even elements from a stack
*/
// Define stack node
class StackNode
{
	var element: Int;
	var next: StackNode ? ;
	constructor(element: Int, next: StackNode ? )
	{
		this.element = element;
		this.next = next;
	}
}
// Define a custom stack
class MyStack
{
	var top: StackNode ? ;
	var size: Int;
	constructor()
	{
		//Set node values
		this.top = null;
		this.size = 0;
	}
	// Add node at the top of stack
	fun push(element: Int): Unit
	{
		this.top = StackNode(element, this.top);
		this.size += 1;
	}
	fun isEmpty(): Boolean
	{
		if (this.size>0 && this.top != null)
		{
			return false;
		}
		else
		{
			return true;
		}
	}
	// Remove top element of stack
	fun pop(): Unit
	{
		if (this.size>0 && this.top != null)
		{
			var temp: StackNode ? = this.top;
			// Change top element of stack
			this.top = temp?.next;
			this.size -= 1;
		}
	}
	// return top element of stack
	fun peek(): Int
	{
		return this.top!!.element;
	}
}
class DeleteElement
{
	var stack: MyStack;
	constructor()
	{
		this.stack = MyStack();
	}
	// Print element of stack
	fun printData(): Unit
	{
		var temp: StackNode ? = this.stack.top;
		while (temp != null)
		{
			// Display element value
			print("   " + temp.element);
			temp = temp.next;
		}
		print("\n");
	}
	// Remove Even element of stack
	fun deleteEven(): Unit
	{
		if (this.stack.isEmpty() == false)
		{
			// When stack not empty
			// Get top element
			var element: Int = this.stack.peek();
			// Remove top element
			this.stack.pop();
			this.deleteEven();
			if (element % 2 != 0)
			{
				// Add odd element in stack
				this.stack.push(element);
			}
		}
	}
}
fun main(args: Array<String>): Unit
{
	var task: DeleteElement = DeleteElement();
	// Add the stack element
	task.stack.push(17);
	task.stack.push(6);
	task.stack.push(5);
	task.stack.push(14);
	task.stack.push(9);
	task.stack.push(12);
	task.stack.push(14);
	/*
	        Created Stack
	        ============

	            14 <- Top
	            12
	            9
	            14
	            5
	            6
	            17
	        */
	print("\n   Stack element \n");
	task.printData();
	// delete operation
	task.deleteEven();
	/*
	        After delete even key element
	        ============

	            9 <- Top
	            5
	            17
	        */
	print("\n   After delete even node in stack \n");
	task.printData();
}

Output

   Stack element
   14   12   9   14   5   6   17

   After delete even node in stack
   9   5   17


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