A queue is a linear data structure that follows the FIFO (First-In-First-Out)<\/strong> principle. Elements are inserted from the rear (enqueue) and removed from the front (dequeue) of the queue. It operates like a real-life queue, such as waiting in line for a ticket.<\/p>\n A queue is a linear data structure that follows the First-In-First-Out (FIFO) principle. It behaves like a real-life queue, where elements are added to the back and removed from the front, just like people waiting in line. The first element inserted is the first one to be removed.<\/p>\n A queue typically supports the following main operations<\/strong><\/p>\n Queues can be implemented using various data structures like arrays or linked lists. One popular implementation is using a linked list.<\/p>\n In C, a queue using a linked list can be represented by a structure containing a pointer to the front and rear nodes of the queue. Each node in the linked list holds an element and a pointer to the next node.<\/p>\n Basic Steps for Queue Implementation<\/strong><\/p>\n A common use case of a queue is in breadth-first search (BFS) algorithms, where nodes are processed level by leve Step 1.<\/strong> Define the Queue Structure<\/p>\n Step 2.<\/strong> Initialize the Queue<\/p>\n Step 3.<\/strong> Enqueue Operation<\/p>\n Step 4.<\/strong> Dequeue Operation<\/p>\nWhat is a Queue?<\/h2>\n
Main Operations of a Queue<\/h3>\n
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Implementation of Queue in C<\/h2>\n
Queue using Linked List<\/h3>\n
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\nhandle memory allocation and deallocation to avoid memory leaks properly.<\/li>\n<\/ol>\nExample Use Case<\/h2>\n
\nl, ensuring that nodes at the same level are visited before moving to the next level.<\/p>\nSteps To Implementation Queue In C<\/h3>\n
\r\n\/\/ queue.h\r\n#ifndef QUEUE_H\r\n#define QUEUE_H\r\n\/\/ Define the data type for elements in the queue\r\ntypedef int QueueElement;\r\n\/\/ Define the structure for the queue\r\ntypedef struct QueueNode {\r\nQueueElement data;\r\nstruct QueueNode* next;\r\n} QueueNode;\r\ntypedef struct Qu\r\neue {\r\nQueueNode* front;\r\nQueueNode* rear;\r\nint size;\r\n} Queue;\r\n#endif \/\/ QUEUE_H<\/code><\/pre>\n\r\n\/\/ queue.c\r\n#include <stdio.h>\r\n#include <stdlib.h>\r\n#include \"queue.h\"\r\n\/\/ Initialize an empty queue\r\nQueue* createQueue() {\r\nQueue* queue = (Queue*)malloc(sizeof(Queue));\r\nqueue->front = NULL;\r\nqueue->rear = NULL;\r\nqueue->size = 0;\r\nreturn queue;\r\n}<\/code><\/pre>\n\r\n\/\/ queue.c (Continued)\r\n\/\/ Add an element to the rear of the queue\r\nvoid enqueue(Queue* queue, QueueElement data) {\r\nQueueNode* newNode = (QueueNode*)malloc(sizeof(QueueNode));\r\nnewNode->data = data;\r\nnewNode->next = NULL;\r\nif (queue->rear == NULL) {\r\nqueue->front = newNode;\r\nqueue->rear = newNode;\r\n} else {\r\nqueue->rear->next = newNode;\r\nqueue->rear = newNode;\r\n}\r\nqueue->size++;\r\n}<\/code><\/pre>\n\r\n\/\/ queue.c (Continued)\r\n\/\/ Remove and return the front element of the queue\r\nQueueElement dequeue(Queue* queue) {\r\nif (queue->front == NULL) {\r\nfprintf(stderr, \"Error: Queue is empty.n\");\r\nexit(EXIT_FAILURE);\r\n}\r\nQueueElement data = queue->front->data;\r\nQueueNode* temp = queue->front;\r\nqueue->front = queue->front->next;\r\nfree(temp);\r\nqueue->size--;\r\nreturn data;\r\n}<\/code><\/pre>\n