{"id":8802,"date":"2024-03-14T08:41:00","date_gmt":"2024-03-14T08:41:00","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-inf-function-in-c\/"},"modified":"2025-08-03T09:48:47","modified_gmt":"2025-08-03T09:48:47","slug":"what-is-the-usage-of-the-inf-function-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-inf-function-in-c\/","title":{"rendered":"C++ Infinity: Using std::numeric_limits"},"content":{"rendered":"<p>In C++, there is no built-in &#8220;inf&#8221; function. However, you can use &#8220;std::numeric_limits&#8221; from the standard math library to obtain the value for infinity. Here is an example code:<\/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;limits&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-type\">double<\/span> inf = std::numeric_limits&lt;<span class=\"hljs-type\">double<\/span>&gt;::<span class=\"hljs-built_in\">infinity<\/span>();\r\n\r\n    std::cout &lt;&lt; <span class=\"hljs-string\">\"\u65e0\u7a77\u5927\u503c\uff1a\"<\/span> &lt;&lt; inf &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>Output:<\/p>\n<pre class=\"post-pre\"><code>\u65e0\u7a77\u5927\u503c\uff1ainf\r\n<\/code><\/pre>\n<p>In this example, we are using the std::numeric_limits::infinity() function to obtain the infinity value of the double data type. The value of infinity will be displayed as &#8220;inf&#8221;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C++, there is no built-in &#8220;inf&#8221; function. However, you can use &#8220;std::numeric_limits&#8221; from the standard math library to obtain the value for infinity. Here is an example code: #include &lt;iostream&gt; #include &lt;limits&gt; int main() { double inf = std::numeric_limits&lt;double&gt;::infinity(); std::cout &lt;&lt; &#8220;\u65e0\u7a77\u5927\u503c\uff1a&#8221; &lt;&lt; inf &lt;&lt; std::endl; return 0; } Output: \u65e0\u7a77\u5927\u503c\uff1ainf In this example, [&hellip;]<\/p>\n","protected":false},"author":14,"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":[274,450,12002,299,12003],"class_list":["post-8802","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c","tag-c-tutorial","tag-infinity","tag-programming","tag-stdnumeric_limits"],"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++ Infinity: Using std::numeric_limits - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to represent infinity in C++ using std::numeric_limits. 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