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Queue.Dequeue() method with example in C#

C# Queue.Dequeue() method: Here, we are going to learn about the Dequeue() method of Queue class in C#.
Submitted by IncludeHelp, on March 30, 2019

C# Queue.Dequeue() method

Queue.Dequeue() method is used to remove an object/element from the beginning of the Queue and returns that object/element.

Syntax:

    Object Queue.Dequeue();

Parameters: None

Return value: Object – it returns the object/element to be removed.

Example:

    declare and initialize a Queue:
    Queue que = new Queue();   

    insertting elements:
    que.Enqueue(100);
    que.Enqueue(200);
    que.Enqueue(300);
    que.Enqueue(400);
    que.Enqueue(500);
    
    removing elements from Queue:
    que.Dequeue();
    que.Dequeue();
    que.Dequeue();

    Output:
    400 500

C# example to remove an object/element from the Queue using Queue.Dequeue() method

using System;
using System.Text;
using System.Collections;

namespace Test
{
    class Program
    {
        //function to print queue elements
        static void printQueue(Queue q)
        {
            foreach (Object obj in q)
            {
                Console.Write(obj + " ");
            }
            Console.WriteLine();
        }

        static void Main(string[] args)
        {
            //declare and initialize a Queue
            Queue que = new Queue();

            //insertting elements
            que.Enqueue(100);
            que.Enqueue(200);
            que.Enqueue(300);
            que.Enqueue(400);
            que.Enqueue(500);

            //printing queue elements
            Console.WriteLine("Queue elements are...");
            printQueue(que);

            //removing elements from Queue
            Console.WriteLine(que.Dequeue() + " is removed...");
            Console.WriteLine(que.Dequeue() + " is removed...");
            Console.WriteLine(que.Dequeue() + " is removed...");

            //printing queue elements after removing elements
            Console.WriteLine("Queue elements are...");
            printQueue(que);

            //hit ENTER to exit
            Console.ReadLine();
        }
    }
}

Output

Queue elements are...
100 200 300 400 500
100 is removed...
200 is removed...
300 is removed...
Queue elements are...
400 500

Reference: Queue.Dequeue Method



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