{"id":28372,"date":"2024-03-16T10:13:10","date_gmt":"2024-03-16T10:13:10","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-calculate-the-length-of-a-doubly-linked-list-in-the-c-language\/"},"modified":"2024-03-22T13:18:02","modified_gmt":"2024-03-22T13:18:02","slug":"how-to-calculate-the-length-of-a-doubly-linked-list-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-calculate-the-length-of-a-doubly-linked-list-in-the-c-language\/","title":{"rendered":"How to calculate the length of a doubly linked list in the C language?"},"content":{"rendered":"<p>To calculate the length of a doubly linked list, the following algorithm can be used:<\/p>\n<ol>\n<li>Declare a variable count and set it to 0 for counting purposes.<\/li>\n<li>Start from the head node of the linked list, and then traverse through each node of the linked list in order.<\/li>\n<li>Count increases by 1 each time a node is traversed.<\/li>\n<li>When reaching the last node of the linked list, the value of count is equal to the length of the linked list.<\/li>\n<li>Return the count as the length of the linked list.<\/li>\n<\/ol>\n<p>Here is a sample code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdlib.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-comment\">\/\/ \u53cc\u5411\u94fe\u8868\u7684\u8282\u70b9\u7ed3\u6784<\/span>\r\n<span class=\"hljs-keyword\">typedef<\/span> <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Node<\/span> {<\/span>\r\n    <span class=\"hljs-type\">int<\/span> data;\r\n    <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Node<\/span> *<span class=\"hljs-title\">prev<\/span>;<\/span> <span class=\"hljs-comment\">\/\/ \u524d\u9a71\u8282\u70b9\u6307\u9488<\/span>\r\n    <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Node<\/span> *<span class=\"hljs-title\">next<\/span>;<\/span> <span class=\"hljs-comment\">\/\/ \u540e\u7ee7\u8282\u70b9\u6307\u9488<\/span>\r\n} Node;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u8ba1\u7b97\u53cc\u5411\u94fe\u8868\u7684\u957f\u5ea6<\/span>\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">getLength<\/span><span class=\"hljs-params\">(Node *head)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> count = <span class=\"hljs-number\">0<\/span>;\r\n    Node *current = head;\r\n    <span class=\"hljs-keyword\">while<\/span> (current != <span class=\"hljs-literal\">NULL<\/span>) {\r\n        count++;\r\n        current = current-&gt;next;\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> count;\r\n}\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u53cc\u5411\u94fe\u8868<\/span>\r\n    Node *head = (Node *)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(Node));\r\n    head-&gt;data = <span class=\"hljs-number\">1<\/span>;\r\n    head-&gt;prev = <span class=\"hljs-literal\">NULL<\/span>;\r\n    Node *node2 = (Node *)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(Node));\r\n    node2-&gt;data = <span class=\"hljs-number\">2<\/span>;\r\n    node2-&gt;prev = head;\r\n    head-&gt;next = node2;\r\n    Node *node3 = (Node *)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(Node));\r\n    node3-&gt;data = <span class=\"hljs-number\">3<\/span>;\r\n    node3-&gt;prev = node2;\r\n    node2-&gt;next = node3;\r\n    node3-&gt;next = <span class=\"hljs-literal\">NULL<\/span>;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8ba1\u7b97\u94fe\u8868\u7684\u957f\u5ea6<\/span>\r\n    <span class=\"hljs-type\">int<\/span> length = getLength(head);\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Length of the doubly linked list: %d\\n\"<\/span>, length);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u91ca\u653e\u94fe\u8868\u5185\u5b58<\/span>\r\n    Node *current = head;\r\n    <span class=\"hljs-keyword\">while<\/span> (current != <span class=\"hljs-literal\">NULL<\/span>) {\r\n        Node *temp = current;\r\n        current = current-&gt;next;\r\n        <span class=\"hljs-built_in\">free<\/span>(temp);\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In this code snippet, we first create a doubly linked list with 3 nodes. We then use the getLength() function to calculate the length of the list and print the result. Finally, we release the memory of the list.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To calculate the length of a doubly linked list, the following algorithm can be used: Declare a variable count and set it to 0 for counting purposes. Start from the head node of the linked list, and then traverse through each node of the linked list in order. Count increases by 1 each time a [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-28372","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to calculate the length of a doubly linked list in the C language? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-calculate-the-length-of-a-doubly-linked-list-in-the-c-language\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to calculate the length of a doubly linked list in the C language?\" \/>\n<meta property=\"og:description\" content=\"To calculate the length of a doubly linked list, the following algorithm can be used: Declare a variable count and set it to 0 for counting purposes. 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