{"id":18943,"date":"2024-03-15T17:53:14","date_gmt":"2024-03-15T17:53:14","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-get-the-actual-length-of-an-array-in-the-c-language\/"},"modified":"2024-03-21T14:31:06","modified_gmt":"2024-03-21T14:31:06","slug":"how-to-get-the-actual-length-of-an-array-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-get-the-actual-length-of-an-array-in-the-c-language\/","title":{"rendered":"How to get the actual length of an array in the C language?"},"content":{"rendered":"

In C language, the length of an array is fixed and cannot be changed once defined. Therefore, ways to obtain the actual usage length of an array include:<\/p>\n

    \n
  1. Keep track of the number of elements in the array by defining a variable to store the actual number of elements being used, and update this variable every time an element is added or removed. For example:<\/li>\n<\/ol>\n
    int<\/span> arr[100<\/span>];  \/\/ \u5047\u8bbe\u6570\u7ec4\u6700\u5927\u957f\u5ea6\u4e3a100<\/span>\r\nint<\/span> length = 0<\/span>;  \/\/ \u8bb0\u5f55\u5b9e\u9645\u4f7f\u7528\u7684\u5143\u7d20\u4e2a\u6570<\/span>\r\n\r\n\/\/ \u6dfb\u52a0\u5143\u7d20<\/span>\r\narr[length] = 10<\/span>;\r\nlength++;\r\n\r\n\/\/ \u5220\u9664\u5143\u7d20<\/span>\r\nlength--;\r\n\r\n\/\/ \u83b7\u53d6\u5b9e\u9645\u4f7f\u7528\u7684\u5143\u7d20\u4e2a\u6570<\/span>\r\nprintf<\/span>(\"\u5b9e\u9645\u4f7f\u7528\u7684\u5143\u7d20\u4e2a\u6570\uff1a%d\\n\"<\/span>, length);\r\n<\/code><\/pre>\n
      \n
    1. Use a specific value of an element as the end marker: Set a specific value (such as 0 or -1) as the end marker in the last element of the array, by iterating through the array to find the position of this end marker. For example:<\/li>\n<\/ol>\n
      int<\/span> arr[] = {1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>, 0<\/span>};  \/\/ \u6570\u7ec4\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u4e3a0\u4f5c\u4e3a\u7ed3\u675f\u6807\u5fd7<\/span>\r\n\r\nint<\/span> length = 0<\/span>;\r\nwhile<\/span> (arr[length] != 0<\/span>) {\r\n    length++;\r\n}\r\n\r\nprintf<\/span>(\"\u5b9e\u9645\u4f7f\u7528\u7684\u5143\u7d20\u4e2a\u6570\uff1a%d\\n\"<\/span>, length);\r\n<\/code><\/pre>\n
        \n
      1. determine the length of a string<\/li>\n<\/ol>\n
        char<\/span> arr[] = \"hello\"<\/span>;\r\nint<\/span> length = strlen<\/span>(arr);\r\n\r\nprintf<\/span>(\"\u5b9e\u9645\u4f7f\u7528\u7684\u5143\u7d20\u4e2a\u6570\uff1a%d\\n\"<\/span>, length);\r\n<\/code><\/pre>\n
        It is important to note that all of the above methods are used to obtain the actual length of an array when the array is known. However, if the array is being passed to a function, it is typically necessary to also pass the array length as a parameter in order to determine the actual length within the function.<\/p>\n","protected":false},"excerpt":{"rendered":"
        In C language, the length of an array is fixed and cannot be changed once defined. Therefore, ways to obtain the actual usage length of an array include: Keep track of the number of elements in the array by defining a variable to store the actual number of elements being used, and update this variable […]<\/p>\n","protected":false},"author":7,"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-18943","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow to get the actual length of an array in the 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\/how-to-get-the-actual-length-of-an-array-in-the-c-language\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to get the actual length of an array in the C language?\" \/>\n<meta property=\"og:description\" content=\"In C language, the length of an array is fixed and cannot be changed once defined. 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