{"id":6868,"date":"2024-03-14T04:45:40","date_gmt":"2024-03-14T04:45:40","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-in-the-c-language-to-determine-if-a-string-is-a-palindrome\/"},"modified":"2025-08-02T09:10:33","modified_gmt":"2025-08-02T09:10:33","slug":"what-is-the-method-in-the-c-language-to-determine-if-a-string-is-a-palindrome","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-in-the-c-language-to-determine-if-a-string-is-a-palindrome\/","title":{"rendered":"C String Palindrome Check: Method &#038; Code"},"content":{"rendered":"<p>One way to determine if a string is a palindrome is to gradually compare the first and last characters, moving towards the center until the two pointers meet or the left pointer is greater than the right pointer. If two characters are found to be unequal during the comparison process, then the string is not a palindrome. Below is a function written in C language to determine if a string is a palindrome:<\/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;string.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">isPalindrome<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span> *str)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> len = <span class=\"hljs-built_in\">strlen<\/span>(str);\r\n    <span class=\"hljs-type\">int<\/span> left = <span class=\"hljs-number\">0<\/span>;\r\n    <span class=\"hljs-type\">int<\/span> right = len - <span class=\"hljs-number\">1<\/span>;\r\n\r\n    <span class=\"hljs-keyword\">while<\/span> (left &lt; right) {\r\n        <span class=\"hljs-keyword\">if<\/span> (str[left] != str[right]) {\r\n            <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n        }\r\n        left++;\r\n        right--;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\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-type\">char<\/span> str[<span class=\"hljs-number\">100<\/span>];\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Enter a string: \"<\/span>);\r\n    <span class=\"hljs-built_in\">scanf<\/span>(<span class=\"hljs-string\">\"%s\"<\/span>, str);\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (isPalindrome(str)) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"The entered string is a palindrome.\\n\"<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"The entered string is not a palindrome.\\n\"<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>The isPalindrome function in the above code is used to determine if the input string is a palindrome. It first calculates the length of the string, then uses two pointers, left and right, to point to the beginning and end of the string. During the loop, if the characters pointed to by the two pointers are not equal, it returns 0, indicating that it is not a palindrome. If the two pointers meet or if the left pointer is greater than the right pointer, it returns 1, indicating that it is a palindrome.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One way to determine if a string is a palindrome is to gradually compare the first and last characters, moving towards the center until the two pointers meet or the left pointer is greater than the right pointer. If two characters are found to be unequal during the comparison process, then the string is not [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[698,381,8573,7296,276],"class_list":["post-6868","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-functions","tag-c-programming","tag-palindrome-check","tag-programming-algorithms","tag-string-manipulation"],"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>C String Palindrome Check: Method &amp; Code - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to check if a string is a palindrome in C language. Complete code example and step-by-step explanation of the method.\" \/>\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\/what-is-the-method-in-the-c-language-to-determine-if-a-string-is-a-palindrome\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C String Palindrome Check: Method &amp; Code\" \/>\n<meta property=\"og:description\" content=\"Learn how to check if a string is a palindrome in C language. 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