Difference between enqueue and dequeue

Question

Can somebody please explain the main differences  I don t have a clear knowledge about these functions in programming for any language

User · Answer

In my opinion one of the worst chosen word's to describe the process, as it is not related to anything in real-life or similar. In general the word "queue" is very bad as if pronounced, it sounds like the English character "q". See the inefficiency here?

enqueue: to place something into a queue; to add an element to the tail of a queue;

dequeue to take something out of a queue; to remove the first available element from the head of a queue

source: https://www.thefreedictionary.com

User · Answer

A queue is a certain 2-sided data structure  You can add new elements on one side  and remove elements from the other side  as opposed to a stack that has only one side   Enqueue means to add an element  dequeue to remove an element  Please have a look here

User · Answer

These are terms usually used when describing a  FIFO  queue  that is  first in  first out    This works like a line   You decide to go to the movies   There is a long line to buy tickets   you decide to get into the queue to buy tickets  that is  Enqueue    at some point you are at the front of the line  and you get to buy a ticket  at which point you leave the line  that is  Dequeue

User · Answer

Enqueue means to add an element  dequeue to remove an element   var stackInput         First stack var stackOutput         Second stack     For enqueue  just push the item into the first stack function enqueue stackInput  item      return stackInput push item      function dequeue stackInput  stackOutput         Reverse the stack such that the first element of the output stack is the      last element of the input stack  After that  pop the top of the output to      get the first element that was ever pushed into the input stack   if  stackOutput length  lt   0        while stackInput length  gt  0          var elementToOutput   stackInput pop          stackOutput push elementToOutput                return stackOutput pop

User · Answer

Some of the basic data structures in programming languages such as C and C   are stacks and queues    The stack data structure follows the  First In Last Out  policy  FILO  where the first element inserted or  pushed  into a stack is the last element that is removed or  popped  from the stack   Similarly  a queue data structure follows a  First In First Out  policy  as in the case of a normal queue when we stand in line at the counter   where the first element is pushed into the queue or  Enqueued  and the same element when it has to be removed from the queue is  Dequeued    This is quite similar to push and pop in a stack  but the terms enqueue and dequeue avoid confusion as to whether the data structure in use is a stack or a queue   Class coders has a simple program to demonstrate the enqueue and dequeue process  You could check it out for reference   http   classcoders blogspot in 2012 01 enque-and-deque-in-c html

User · Answer

Enqueue and Dequeue tend to be operations on a queue  a data structure that does exactly what it sounds like it does  You enqueue items at one end and dequeue at the other  just like a line of people queuing up for tickets to the latest Taylor Swift concert  I was originally going to say Billy Joel but that would date me severely   There are variations of queues such as double-ended ones where you can enqueue and dequeue at either end but the vast majority would be the simpler form              --- --- ---  enqueue - gt    3   2   1   - gt  dequeue             --- --- ---   That diagram shows a queue where you ve enqueued the numbers 1  2 and 3 in that order  without yet dequeuing any   By way of example  here s some Python code that shows a simplistic queue in action  with enqueue and dequeue functions  Were it more serious code  it would be implemented as a class but it should be enough to illustrate the workings  import random  def enqueue lst  itm       lst append itm           Just add item to end of list      return lst               And return list  for consistency with dequeue    def dequeue lst       itm   lst 0              Grab the first item in list      lst   lst 1              Change list to remove first item      return  itm  lst         Then return item and new list     Test harness  Start with empty queue   myList         Enqueue or dequeue a bit  with latter having probability of 10    for   in range 15       if random randint 0  9     0 and len myList   gt  0           itm  myList    dequeue myList          print f quot Dequeued  itm  to give  myList  quot       else          itm   10   random randint 1  9          myList   enqueue myList  itm          print f quot Enqueued  itm  to give  myList  quot      Now dequeue remainder of list   print  quot          quot   while len myList   gt  0       itm  myList    dequeue myList      print f quot Dequeued  itm  to give  myList  quot    A sample run of that shows it in operation  Enqueued 70 to give  70  Enqueued 20 to give  70  20  Enqueued 40 to give  70  20  40  Enqueued 50 to give  70  20  40  50  Dequeued 70 to give  20  40  50  Enqueued 20 to give  20  40  50  20  Enqueued 30 to give  20  40  50  20  30  Enqueued 20 to give  20  40  50  20  30  20  Enqueued 70 to give  20  40  50  20  30  20  70  Enqueued 20 to give  20  40  50  20  30  20  70  20  Enqueued 20 to give  20  40  50  20  30  20  70  20  20  Dequeued 20 to give  40  50  20  30  20  70  20  20  Enqueued 80 to give  40  50  20  30  20  70  20  20  80  Dequeued 40 to give  50  20  30  20  70  20  20  80  Enqueued 90 to give  50  20  30  20  70  20  20  80  90           Dequeued 50 to give  20  30  20  70  20  20  80  90  Dequeued 20 to give  30  20  70  20  20  80  90  Dequeued 30 to give  20  70  20  20  80  90  Dequeued 20 to give  70  20  20  80  90  Dequeued 70 to give  20  20  80  90  Dequeued 20 to give  20  80  90  Dequeued 20 to give  80  90  Dequeued 80 to give  90  Dequeued 90 to give

[queue] Difference between "enqueue" and "dequeue"

Examples related to queue

Examples related to programming-languages