{"id":10154,"date":"2024-03-14T11:38:42","date_gmt":"2024-03-14T11:38:42","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-static-keyword-in-the-c-programming-language\/"},"modified":"2025-08-03T19:53:00","modified_gmt":"2025-08-03T19:53:00","slug":"what-is-the-usage-of-the-static-keyword-in-the-c-programming-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-static-keyword-in-the-c-programming-language\/","title":{"rendered":"Static Keyword in C: Usage Explained"},"content":{"rendered":"

In the C language, the static keyword can be used to represent two different meanings:<\/p>\n

    \n
  1. Using the static keyword inside a function: The static keyword can be used to declare variables or functions within a function, in which case it restricts the scope of the variable or function to the source file where they are defined, preventing access from other files. Additionally, static variables persist throughout the program’s runtime rather than being destroyed after the function call ends.<\/li>\n<\/ol>\n
    void<\/span> foo<\/span>()<\/span> {\r\n    static<\/span> int<\/span> counter = 0<\/span>;\r\n    counter++;\r\n    printf<\/span>(\"%d\\n\"<\/span>, counter);\r\n}\r\n\r\nint<\/span> main<\/span>()<\/span> {\r\n    foo();  \/\/ \u8f93\u51fa1<\/span>\r\n    foo();  \/\/ \u8f93\u51fa2<\/span>\r\n    return<\/span> 0<\/span>;\r\n}\r\n<\/code><\/pre>\n
      \n
    1. Using the ‘static’ keyword before a global variable: The ‘static’ keyword can be used to restrict the scope of a global variable, allowing the variable to only be accessed within the source file where it is defined and not by other files.<\/li>\n<\/ol>\n
      \/\/ file1.c<\/span>\r\nstatic<\/span> int<\/span> global_var = 10<\/span>;\r\n\r\n\/\/ file2.c<\/span>\r\nextern<\/span> int<\/span> global_var;  \/\/ \u8fd9\u91cc\u4f1a\u62a5\u9519\uff0c\u56e0\u4e3aglobal_var\u7684\u4f5c\u7528\u57df\u88ab\u9650\u5236\u5728file1.c\u5185<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
      In the C language, the static keyword can be used to represent two different meanings: Using the static keyword inside a function: The static keyword can be used to declare variables or functions within a function, in which case it restricts the scope of the variable or function to the source file where they are […]<\/p>\n","protected":false},"author":8,"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":[331,381,12523,12522,9734],"class_list":["post-10154","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-language","tag-c-programming","tag-programming-fundamentals","tag-static-keyword","tag-variable-scope"],"yoast_head":"\nStatic Keyword in C: Usage Explained - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how the static keyword controls variable scope and persistence in C programming. 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