{"id":118568,"date":"2024-03-23T14:58:04","date_gmt":"2024-03-23T05:58:04","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%aestrlen%e3%81%a8sizeof%e3%81%ae%e9%81%95%e3%81%84\/"},"modified":"2024-04-05T18:05:26","modified_gmt":"2024-04-05T09:05:26","slug":"c%e8%a8%80%e8%aa%9e%e3%81%aestrlen%e3%81%a8sizeof%e3%81%ae%e9%81%95%e3%81%84","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%aestrlen%e3%81%a8sizeof%e3%81%ae%e9%81%95%e3%81%84\/","title":{"rendered":"C\u8a00\u8a9e\u306estrlen\u3068sizeof\u306e\u9055\u3044"},"content":{"rendered":"

strlen\u3068sizeof\u306f\u3069\u3061\u3089\u3082C\u8a00\u8a9e\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u95a2\u6570\u3067\u3059\u304c\u3001\u6a5f\u80fd\u3084\u76ee\u7684\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n

    \n
  1. strlen\u95a2\u6570:<\/li>\n<\/ol>\n

    strlen \u95a2\u6570\u306f\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\uff08\u7d42\u7aef\u30cc\u30eb\u6587\u5b57\u306e ‘\\0’ \u306f\u9664\u304d\u307e\u3059\uff09\u3002\u5ba3\u8a00\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n

    size_t<\/span> strlen<\/span>(const<\/span> char<\/span> *str)<\/span>;\r\n<\/code><\/pre>\n
    str\u306fnull\u6587\u5b57\u3067\u7d42\u308f\u308b\u6587\u5b57\u5217\u3078\u306e\u30dd\u30a4\u30f3\u30bf\u3067\u3059\u3002strlen\u95a2\u6570\u306f\u3001\u6587\u5b57\u5217\u306e\u6587\u5b57\u3092null\u6587\u5b57\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u30eb\u30fc\u30d7\u3057\u3001\u6587\u5b57\u306e\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
    \u4f8b\u3048\u3070\u3001<\/p>\n
    char<\/span> str[] = \"Hello World\"<\/span>;\r\nsize_t<\/span> len = strlen<\/span>(str);  \/\/ len\u7684\u503c\u4e3a11<\/span>\r\n<\/code><\/pre>\n
      \n
    1. sizeof \u6f14\u7b97\u5b50<\/li>\n<\/ol>\n
      sizeof\u6f14\u7b97\u5b50\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30c7\u30fc\u30bf\u578b\u306e\u30b5\u30a4\u30ba\u3001\u307e\u305f\u306f\u5909\u6570\u306e\u30b5\u30a4\u30ba\uff08\u30d0\u30a4\u30c8\u5358\u4f4d\uff09\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002\u305d\u306e\u4f7f\u7528\u65b9\u6cd5\u306f2\u3064\u3042\u308b\u3002<\/p>\n
        \n
      1. \u30c7\u30fc\u30bf\u578b\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u307e\u3059:<\/li>\n<\/ol>\n
        sizeof<\/span>(type)\r\n<\/code><\/pre>\n
          \n
        1. \u5909\u6570\u3084\u5f0f\u3067\u4f7f\u7528\u3055\u308c\u308b<\/li>\n<\/ol>\n
          sizeof<\/span>(object)\r\n<\/code><\/pre>\n
          sizeof()\u306f\u7b26\u53f7\u306a\u3057\u6574\u6570\uff08size_t\u578b\uff09\u3092\u8fd4\u3057\u3001\u6307\u5b9a\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d0\u30a4\u30c8\u6570\u3092\u793a\u3059\u3002<\/p>\n
          \u4f8b\u3048\u3070\u3001<\/p>\n
          int<\/span> arr[5<\/span>];\r\nsize_t<\/span> size1 = sizeof<\/span>(int<\/span>);   \/\/ size1\u7684\u503c\u4e3a4\uff08\u5047\u8bbeint\u7c7b\u578b\u53604\u4e2a\u5b57\u8282\uff09<\/span>\r\nsize_t<\/span> size2 = sizeof<\/span>(arr);   \/\/ size2\u7684\u503c\u4e3a20\uff08\u5047\u8bbeint\u7c7b\u578b\u53604\u4e2a\u5b57\u8282\uff0c\u6570\u7ec4\u957f\u5ea6\u4e3a5\uff09<\/span>\r\n<\/code><\/pre>\n
          strlen\u306f\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u3001sizeof\u306f\u30c7\u30fc\u30bf\u578b\u3084\u5909\u6570\u306e\u5927\u304d\u3055\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          strlen\u3068sizeof\u306f\u3069\u3061\u3089\u3082C\u8a00\u8a9e\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u95a2\u6570\u3067\u3059\u304c\u3001\u6a5f\u80fd\u3084\u76ee\u7684\u304c\u7570\u306a\u308a\u307e\u3059\u3002 strlen\u95a2\u6570: strlen \u95a2\u6570\u306f\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\uff08\u7d42\u7aef\u30cc\u30eb\u6587\u5b57\u306e ‘\\0&#821 […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-118568","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nC\u8a00\u8a9e\u306estrlen\u3068sizeof\u306e\u9055\u3044 - 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\/ja\/blog\/c\u8a00\u8a9e\u306estrlen\u3068sizeof\u306e\u9055\u3044\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u8a00\u8a9e\u306estrlen\u3068sizeof\u306e\u9055\u3044\" \/>\n<meta property=\"og:description\" content=\"strlen\u3068sizeof\u306f\u3069\u3061\u3089\u3082C\u8a00\u8a9e\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u95a2\u6570\u3067\u3059\u304c\u3001\u6a5f\u80fd\u3084\u76ee\u7684\u304c\u7570\u306a\u308a\u307e\u3059\u3002 strlen\u95a2\u6570: strlen \u95a2\u6570\u306f\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\uff08\u7d42\u7aef\u30cc\u30eb\u6587\u5b57\u306e ‘&#821 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/c\u8a00\u8a9e\u306estrlen\u3068sizeof\u306e\u9055\u3044\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-23T05:58:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-05T09:05:26+00:00\" \/>\n<meta name=\"author\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%aestrlen%e3%81%a8sizeof%e3%81%ae%e9%81%95%e3%81%84\/\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%aestrlen%e3%81%a8sizeof%e3%81%ae%e9%81%95%e3%81%84\/\",\"name\":\"C\u8a00\u8a9e\u306estrlen\u3068sizeof\u306e\u9055\u3044 - Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#website\"},\"datePublished\":\"2024-03-23T05:58:04+00:00\",\"dateModified\":\"2024-04-05T09:05:26+00:00\",\"author\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%aestrlen%e3%81%a8sizeof%e3%81%ae%e9%81%95%e3%81%84\/#breadcrumb\"},\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%aestrlen%e3%81%a8sizeof%e3%81%ae%e9%81%95%e3%81%84\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/c%e8%a8%80%e8%aa%9e%e3%81%aestrlen%e3%81%a8sizeof%e3%81%ae%e9%81%95%e3%81%84\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.silicloud.com\/ja\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"C\u8a00\u8a9e\u306estrlen\u3068sizeof\u306e\u9055\u3044\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#website\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/\",\"name\":\"Blog - 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