{"id":17101,"date":"2024-03-15T14:17:14","date_gmt":"2024-03-15T14:17:14","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-setlocale-function-used\/"},"modified":"2025-08-07T08:31:18","modified_gmt":"2025-08-07T08:31:18","slug":"how-is-the-setlocale-function-used","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-setlocale-function-used\/","title":{"rendered":"How is the setlocale function used?"},"content":{"rendered":"<p>The setlocale function is used to define the localization settings of a program.<\/p>\n<p>The grammar is as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;locale.h&gt;<\/span><\/span>\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">char<\/span>* <span class=\"hljs-title\">setlocale<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> category, <span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">char<\/span>* locale)<\/span><\/span>;\r\n<\/code><\/pre>\n<p>Instructions for parameters:<\/p>\n<ol>\n<li>Category: Classification of the localization environment to be set, it can be one of the following constants:\n<p>LC_ALL: Set all categories.<br \/>\nLC_COLLATE: Set rules for string comparison and sorting.<br \/>\nLC_CTYPE: Set rules for character classification and conversion.<br \/>\nLC_MONETARY: Set currency format and symbols.<br \/>\nLC_NUMERIC: Set number format.<br \/>\nLC_TIME: Set date and time format.<\/li>\n<li>The locale string to be set can be in one of the following formats:\n<p>An empty string (&#8220;&#8221;): to use the default locale.<br \/>\nThe name of a specific locale, such as &#8220;en_US&#8221;, &#8220;zh_CN&#8221;, etc.<br \/>\n&#8220;C&#8221;: to use the localization environment of the C language, meaning no localization processing will be done.<\/li>\n<\/ol>\n<p>The return value is the localized environment string if the setting is successful, otherwise NULL is returned.<\/p>\n<p>Example Usage:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;iostream&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;locale.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;ctime&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    <span class=\"hljs-built_in\">setlocale<\/span>(LC_ALL, <span class=\"hljs-string\">\"\"<\/span>); <span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u9ed8\u8ba4\u7684\u672c\u5730\u5316\u73af\u5883<\/span>\r\n    \r\n    <span class=\"hljs-type\">time_t<\/span> now = <span class=\"hljs-built_in\">time<\/span>(<span class=\"hljs-literal\">NULL<\/span>);\r\n    <span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title class_\">tm<\/span>* timeinfo = <span class=\"hljs-built_in\">localtime<\/span>(&amp;now);\r\n    <span class=\"hljs-type\">char<\/span> buffer[<span class=\"hljs-number\">80<\/span>];\r\n    \r\n    <span class=\"hljs-built_in\">strftime<\/span>(buffer, <span class=\"hljs-built_in\">sizeof<\/span>(buffer), <span class=\"hljs-string\">\"%c\"<\/span>, timeinfo);\r\n    std::cout &lt;&lt; <span class=\"hljs-string\">\"\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\uff1a\"<\/span> &lt;&lt; buffer &lt;&lt; std::endl;\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 example program above has the default localization environment set and uses the strftime function to format the current date and time into a string for printing.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The setlocale function is used to define the localization settings of a program. The grammar is as follows: #include &lt;locale.h&gt; char* setlocale(int category, const char* locale); Instructions for parameters: Category: Classification of the localization environment to be set, it can be one of the following constants: LC_ALL: Set all categories. LC_COLLATE: Set rules for string [&hellip;]<\/p>\n","protected":false},"author":9,"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":[453,1402,299,1404,1403],"class_list":["post-17101","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"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 is the setlocale function used? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about how is the setlocale function used?. 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