It works on the principle of FIFO (First In First Out). deleteFront(): Deletes an item from front of Deque.                     }                                           The enqueue() and dequeue() are two important functions used in a queue.         P->rear=0;         P->front=(P->front+1)%MAX;      There are two types of de-queue Input restricted de-queue — this queue allows insertion only at one end but allow deletion at both ends .                     {         P->rear=0;     return(x); Yash is a Full Stack web developer.             case 3: printf("\nInsert Element :"); In this tutorial, you will understand the queue data structure and it's implementations in Python, Java, C, and C++. void enqueueR(dequeue *p,int x);     }while(op!=7);     P->front=-1;                     x=dequeueR(&q); int dequeueR(dequeue *P)         P->data=x; A double ended queue also called as deque (pronounced as ‘deck’ or ‘dequeue’) is a list in which the elements can be inserted or deleted at either end in constant time. Step 2− If the queue is empty, produce underflow error and exit.                         printf("\nQueue is Empty!! What is Double Ended Queue (DeQueue)? Get all latest content delivered straight to your inbox.     }     i=P->front;              P->rear=(P->rear+1)%MAX;     else {                     break; Insertion and deletion can be done from both side( FRONT & REAR).     {                     break; Program to implement dequeue using doubly linked list in a python programming language. DeQueue stands for Double Ended Queue.                     {                         scanf("%d",&x); The Operations in DeQueue are. It is also known as a head-tail linked list because elements can be added to or removed from either the front (head) or the back (tail) end.     } "); }       if(P->rear==P->front)    //delete the last element         printf("\n%d",P->data[i]); {                     }                              Step 5− Return success.                     scanf("%d",&n); ######################################################################3.                  case 5: if(empty(&q))                             printf("\nQueue is Full!! #define MAX 30             case 4: if(empty(&q))     int data[MAX];         return(1); According to its FIFO structure, element inserted first will also be removed first. int dequeueF(dequeue *P)                         exit(0);         printf("\nQueue is empty!!     return(0); Once a new element is inserted into the Queue, all the elements inserted before the new element in the queue must be removed, to remove the new element. It is similar to the ticket queue outside a cinema hall, where the first person entering the queue is the first person who gets the ticket. insertLast(): Adds an item at the rear of Deque. ");                     {     x=P->data[P->rear];                          }                                                  break;     {         P->data[P->front]=x;         initialize(P);     if(empty(P))                     break; A List data structure is quick to insert or delete in the beginning of the list, end or in the middle.                     if(full(&q))     { 4. peek( ) function is oftenly used to return the value of first element without dequeuing it.             case 1: printf("\nEnter number of elements:"); void enqueueF(dequeue *P,int x)                              the term de-queue is taken from double ended Q.. Dequeue (Removal) How to create queue data structure using array. #define MAX 30. typedef struct dequeue. A good example of a queue is any queue of consumers for a resource where the consumer that came first is served first.                         exit(0); There are two types of de-queue Input restricted de-queue — this queue allows insertion only at one end but allow deletion at both ends .

## what is dequeue in data structure

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