{"id":24308,"date":"2024-03-16T02:56:44","date_gmt":"2024-03-16T02:56:44","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-declaring-global-variables-in-c-language\/"},"modified":"2024-03-22T03:23:57","modified_gmt":"2024-03-22T03:23:57","slug":"what-is-the-method-of-declaring-global-variables-in-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-declaring-global-variables-in-c-language\/","title":{"rendered":"What is the method of declaring global variables in C language?"},"content":{"rendered":"

In C language, the keyword extern is used to indicate the declaration of global variables. Global variable declarations are typically placed outside functions, above all functions. Here is how global variables are declared:<\/p>\n

    \n
  1. Declare variables globally.<\/li>\n<\/ol>\n
    int globalVariable; \/\/ \u58f0\u660e\u4e00\u4e2a\u5168\u5c40int\u7c7b\u578b\u53d8\u91cf\r\n<\/code><\/pre>\n
      \n
    1. Declare and initialize variables on a global scale.<\/li>\n<\/ol>\n
      int globalVariable = 10; \/\/ \u58f0\u660e\u5e76\u521d\u59cb\u5316\u4e00\u4e2a\u5168\u5c40int\u7c7b\u578b\u53d8\u91cf\r\n<\/code><\/pre>\n
        \n
      1. Declare a variable on a global scale and indicate that it is defined in another file by using the “extern” keyword.<\/li>\n<\/ol>\n
        extern int globalVariable; \/\/ \u58f0\u660e\u4e00\u4e2a\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u5b9a\u4e49\u7684\u5168\u5c40int\u7c7b\u578b\u53d8\u91cf\r\n<\/code><\/pre>\n
        It is important to note that global variables should not be initialized when declared. Initialization should be done at the point of definition. Also, when using global variables in other files, the extern keyword should be used at the point of use to indicate that the variable is defined in another file.<\/p>\n","protected":false},"excerpt":{"rendered":"
        In C language, the keyword extern is used to indicate the declaration of global variables. Global variable declarations are typically placed outside functions, above all functions. Here is how global variables are declared: Declare variables globally. int globalVariable; \/\/ \u58f0\u660e\u4e00\u4e2a\u5168\u5c40int\u7c7b\u578b\u53d8\u91cf Declare and initialize variables on a global scale. int globalVariable = 10; \/\/ \u58f0\u660e\u5e76\u521d\u59cb\u5316\u4e00\u4e2a\u5168\u5c40int\u7c7b\u578b\u53d8\u91cf Declare […]<\/p>\n","protected":false},"author":6,"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-24308","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nWhat is the method of declaring global variables in 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\/what-is-the-method-of-declaring-global-variables-in-c-language\/\" \/>\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 declaring global variables in C language?\" \/>\n<meta property=\"og:description\" content=\"In C language, the keyword extern is used to indicate the declaration of global variables. Global variable declarations are typically placed outside functions, above all functions. Here is how global variables are declared: Declare variables globally. int globalVariable; \/\/ \u58f0\u660e\u4e00\u4e2a\u5168\u5c40int\u7c7b\u578b\u53d8\u91cf Declare and initialize variables on a global scale. int globalVariable = 10; \/\/ \u58f0\u660e\u5e76\u521d\u59cb\u5316\u4e00\u4e2a\u5168\u5c40int\u7c7b\u578b\u53d8\u91cf Declare […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-declaring-global-variables-in-c-language\/\" \/>\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=\"2024-03-16T02:56:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T03:23:57+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin Taylor\" \/>\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=\"Benjamin Taylor\" \/>\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-declaring-global-variables-in-c-language\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-declaring-global-variables-in-c-language\/\"},\"author\":{\"name\":\"Benjamin Taylor\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/ac801fe9549a25960ce48aa2e0a691c9\"},\"headline\":\"What is the method of declaring global variables in C language?\",\"datePublished\":\"2024-03-16T02:56:44+00:00\",\"dateModified\":\"2024-03-22T03:23:57+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-declaring-global-variables-in-c-language\/\"},\"wordCount\":128,\"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-declaring-global-variables-in-c-language\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-declaring-global-variables-in-c-language\/\",\"name\":\"What is the method of declaring global variables in C language? 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