{"id":24162,"date":"2024-03-16T02:42:04","date_gmt":"2024-03-16T02:42:04","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/"},"modified":"2024-03-22T03:01:52","modified_gmt":"2024-03-22T03:01:52","slug":"what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/","title":{"rendered":"What is the method of directly assigning a value to an extern in c++?"},"content":{"rendered":"<p>In C++, you can use the keyword extern to declare an external variable, and then assign a value to this variable in another file. The specific method is as follows:<\/p>\n<p>Firstly, use the &#8216;extern&#8217; keyword in the file where the variable is being declared. For example, if we have an integer variable named &#8216;var&#8217;, it can be declared in the file like this:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">extern<\/span> <span class=\"hljs-type\">int<\/span> var;\r\n<\/code><\/pre>\n<p>After that, in the file where the variable is assigned, we can directly assign a value to it, for example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> var = <span class=\"hljs-number\">10<\/span>;\r\n<\/code><\/pre>\n<p>In this way, the variable &#8216;var&#8217; is assigned a value of 10. When using this variable in other files, the value from the assignment file will be used.<\/p>\n<p>It is important to note that the keyword &#8220;extern&#8221; is used only for declaring variables, not defining them. Therefore, variables need to be defined again in the assignment file.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C++, you can use the keyword extern to declare an external variable, and then assign a value to this variable in another file. The specific method is as follows: Firstly, use the &#8216;extern&#8217; keyword in the file where the variable is being declared. For example, if we have an integer variable named &#8216;var&#8217;, it [&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-24162","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>What is the method of directly assigning a value to an extern in c++? - 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\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the method of directly assigning a value to an extern in c++?\" \/>\n<meta property=\"og:description\" content=\"In C++, you can use the keyword extern to declare an external variable, and then assign a value to this variable in another file. The specific method is as follows: Firstly, use the &#8216;extern&#8217; keyword in the file where the variable is being declared. For example, if we have an integer variable named &#8216;var&#8217;, it [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T02:42:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T03:01:52+00:00\" \/>\n<meta name=\"author\" content=\"Emily Johnson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Emily Johnson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/\"},\"author\":{\"name\":\"Emily Johnson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3b041b19cffc258705478ecfab895378\"},\"headline\":\"What is the method of directly assigning a value to an extern in c++?\",\"datePublished\":\"2024-03-16T02:42:04+00:00\",\"dateModified\":\"2024-03-22T03:01:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/\"},\"wordCount\":153,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-directly-assigning-a-value-to-an-extern-in-c\/\",\"name\":\"What is the method of directly assigning a value to an extern in c++? 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