{"id":3237,"date":"2025-12-27T05:29:48","date_gmt":"2025-12-27T04:29:48","guid":{"rendered":"https:\/\/codeflarelimited.com\/blog\/?p=3237"},"modified":"2025-12-27T05:29:50","modified_gmt":"2025-12-27T04:29:50","slug":"c-queue","status":"publish","type":"post","link":"https:\/\/codeflarelimited.com\/blog\/c-queue\/","title":{"rendered":"C++ Queue"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1. What Is a Queue?<\/h2>\n\n\n\n<p>A&nbsp;<strong>Queue<\/strong>&nbsp;is a&nbsp;<strong>linear data structure<\/strong>&nbsp;that follows the principle:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>FIFO \u2013 First In, First Out<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p><a href=\"https:\/\/codeflarelimited.com\">So many people are already benefiting from this software development course<\/a><\/p>\n\n\n\n<p>This means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The\u00a0<strong>first element added<\/strong>\u00a0is the\u00a0<strong>first one removed<\/strong><\/li>\n\n\n\n<li>Just like a\u00a0<strong>real-life queue<\/strong>\u00a0(bank line, food line)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Example (Real-Life Analogy)<\/h3>\n\n\n\n<p><a href=\"https:\/\/app.codeflarelimited.com\">Learn coding online<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">People in line:  A \u2192 B \u2192 C \u2192 D\nServed first:    A<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2. Basic Operations of a Queue<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Operation<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td><code>enqueue<\/code><\/td><td>Add an element to the&nbsp;<strong>rear<\/strong><\/td><\/tr><tr><td><code>dequeue<\/code><\/td><td>Remove an element from the&nbsp;<strong>front<\/strong><\/td><\/tr><tr><td><code>front<\/code><\/td><td>Get the front element<\/td><\/tr><tr><td><code>back<\/code><\/td><td>Get the last element<\/td><\/tr><tr><td><code>isEmpty<\/code><\/td><td>Check if queue is empty<\/td><\/tr><tr><td><code>size<\/code><\/td><td>Number of elements<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">3. Queue in C++ (STL)<\/h2>\n\n\n\n<p>C++ provides the&nbsp;<strong>queue container<\/strong>&nbsp;in the&nbsp;<strong>Standard Template Library (STL)<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Header File<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">#include &lt;queue><\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Declaration<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">queue&lt;int> q;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">4. Basic Queue Example<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">#include &lt;iostream>\n#include &lt;queue>\nusing namespace std;\n\nint main() {\n    queue&lt;int> q;\n\n    q.push(10);   \/\/ enqueue\n    q.push(20);\n    q.push(30);\n\n    cout &lt;&lt; \"Front: \" &lt;&lt; q.front() &lt;&lt; endl; \/\/ 10\n    cout &lt;&lt; \"Back: \" &lt;&lt; q.back() &lt;&lt; endl;   \/\/ 30\n\n    q.pop(); \/\/ dequeue\n\n    cout &lt;&lt; \"Front after pop: \" &lt;&lt; q.front() &lt;&lt; endl; \/\/ 20\n    cout &lt;&lt; \"Size: \" &lt;&lt; q.size() &lt;&lt; endl;\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">5. Queue Functions Explained<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Function<\/th><th>Purpose<\/th><\/tr><\/thead><tbody><tr><td><code>push(x)<\/code><\/td><td>Insert element at rear<\/td><\/tr><tr><td><code>pop()<\/code><\/td><td>Remove front element<\/td><\/tr><tr><td><code>front()<\/code><\/td><td>Access first element<\/td><\/tr><tr><td><code>back()<\/code><\/td><td>Access last element<\/td><\/tr><tr><td><code>empty()<\/code><\/td><td>Returns true if empty<\/td><\/tr><tr><td><code>size()<\/code><\/td><td>Returns number of elements<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">6. Visual Representation<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">Queue (FIFO)\n\nFront \u2192 [10] [20] [30] \u2190 Rear\n\npop() removes 10<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">7. Internal Working of STL Queue<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>STL\u00a0<code>queue<\/code>\u00a0is implemented using:\n<ul class=\"wp-block-list\">\n<li><code>deque<\/code>\u00a0(default)<\/li>\n\n\n\n<li>Can also be implemented with\u00a0<code>list<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">queue&lt;int, deque&lt;int>> q;\nqueue&lt;int, list&lt;int>> q;<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u2757 You&nbsp;<strong>cannot<\/strong>&nbsp;access elements randomly (no indexing like arrays).<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">8. Types of Queues<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Simple Queue<\/h3>\n\n\n\n<p>Basic FIFO structure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Circular Queue<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rear connects back to front<\/li>\n\n\n\n<li>Efficient memory usage<\/li>\n\n\n\n<li>Used in\u00a0<strong>CPU scheduling<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Priority Queue<\/h3>\n\n\n\n<p>Elements served based on&nbsp;<strong>priority<\/strong>, not order.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#include &lt;queue&gt;\n\npriority_queue&lt;int&gt; pq;\npq.push(10);\npq.push(50);\npq.push(20);\n\n\/\/ Top = 50\n<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Max Heap by default<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">4. Double-Ended Queue (Deque)<\/h3>\n\n\n\n<p>Insert\/remove from&nbsp;<strong>both ends<\/strong>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">#include &lt;deque&gt;\n\ndeque&lt;int&gt; dq;\ndq.push_front(10);\ndq.push_back(20);\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">9. Implementing Queue Using Array (Manual)<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">#define SIZE 5\nint arr[SIZE];\nint front = -1, rear = -1;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Enqueue<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">void enqueue(int x) {\n    if (rear == SIZE - 1)\n        cout &lt;&lt; \"Queue Overflow\";\n    else {\n        if (front == -1) front = 0;\n        arr[++rear] = x;\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Dequeue<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"cpp\" class=\"language-cpp\">void dequeue() {\n    if (front == -1 || front > rear)\n        cout &lt;&lt; \"Queue Underflow\";\n    else\n        front++;\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">10. Implementing Queue Using Linked List<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Each node has:\n<ul class=\"wp-block-list\">\n<li><code>data<\/code><\/li>\n\n\n\n<li><code>next<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>Advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dynamic size<\/li>\n\n\n\n<li>No overflow (until memory full)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">11. Time &amp; Space Complexity<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Operation<\/th><th>Time Complexity<\/th><\/tr><\/thead><tbody><tr><td>Enqueue<\/td><td>O(1)<\/td><\/tr><tr><td>Dequeue<\/td><td>O(1)<\/td><\/tr><tr><td>Front\/Back<\/td><td>O(1)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Space Complexity:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>O(n)<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">12. Applications of Queue<\/h2>\n\n\n\n<p>\u2714 CPU Scheduling<br>\u2714 Breadth-First Search (BFS)<br>\u2714 Print Queue<br>\u2714 Call Center Systems<br>\u2714 Message Queues<br>\u2714 Order Processing Systems<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">13. Queue vs Stack<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Stack<\/th><th>Queue<\/th><\/tr><\/thead><tbody><tr><td>LIFO<\/td><td>FIFO<\/td><\/tr><tr><td>Push\/Pop<\/td><td>Enqueue\/Dequeue<\/td><\/tr><tr><td>Used in recursion<\/td><td>Used in scheduling<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">14. Common Mistakes<\/h2>\n\n\n\n<p>\u274c Accessing queue elements using index<br>\u274c Calling&nbsp;<code>front()<\/code>&nbsp;on empty queue<br>\u274c Forgetting&nbsp;<code>#include &lt;queue&gt;<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">15. When to Use Queue?<\/h2>\n\n\n\n<p>Use a queue when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Order of processing matters<\/li>\n\n\n\n<li>Tasks must be handled sequentially<\/li>\n\n\n\n<li>Fair scheduling is required<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Summary<\/h3>\n\n\n\n<p>A&nbsp;<strong>queue in C++<\/strong>&nbsp;is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A FIFO data structure<\/li>\n\n\n\n<li>Provided by STL for efficiency<\/li>\n\n\n\n<li>Essential for algorithms and system design<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>1. What Is a Queue? A&nbsp;Queue&nbsp;is a&nbsp;linear data structure&nbsp;that follows the principle: FIFO \u2013 First In, First Out<\/p>\n","protected":false},"author":1,"featured_media":3238,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[98],"tags":[],"class_list":["post-3237","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-softare-development"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C++ Queue<\/title>\n<meta name=\"description\" content=\"A\u00a0Queue\u00a0is a\u00a0linear data structure\u00a0that follows the principle:FIFO \u2013 First In, First Out. 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