{"id":22286,"date":"2024-03-15T23:19:24","date_gmt":"2024-03-15T23:19:24","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/"},"modified":"2024-03-21T22:31:03","modified_gmt":"2024-03-21T22:31:03","slug":"how-to-open-a-file-and-read-data-in-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/","title":{"rendered":"How to open a file and read data in C language?"},"content":{"rendered":"<p>In C language, you can open a file using the fopen function and read data using the fscanf or fgets function.<\/p>\n<p>Here is an example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    FILE *file; <span class=\"hljs-comment\">\/\/ \u6587\u4ef6\u6307\u9488<\/span>\r\n    <span class=\"hljs-type\">char<\/span> buffer[<span class=\"hljs-number\">100<\/span>]; <span class=\"hljs-comment\">\/\/ \u7528\u4e8e\u5b58\u50a8\u8bfb\u53d6\u7684\u6570\u636e<\/span>\r\n\r\n    file = fopen(<span class=\"hljs-string\">\"file.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>); <span class=\"hljs-comment\">\/\/ \u6253\u5f00\u540d\u4e3afile.txt\u7684\u6587\u4ef6\u4ee5\u8bfb\u53d6\u6570\u636e<\/span>\r\n    <span class=\"hljs-keyword\">if<\/span> (file == <span class=\"hljs-literal\">NULL<\/span>) { <span class=\"hljs-comment\">\/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u6210\u529f\u6253\u5f00<\/span>\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6\\n\"<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u4f7f\u7528fscanf\u51fd\u6570\u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u6570\u636e<\/span>\r\n    <span class=\"hljs-comment\">\/\/ %s\u8868\u793a\u8bfb\u53d6\u5b57\u7b26\u4e32\uff0c%d\u8868\u793a\u8bfb\u53d6\u6574\u6570\uff0c%f\u8868\u793a\u8bfb\u53d6\u6d6e\u70b9\u6570\u7b49<\/span>\r\n    <span class=\"hljs-keyword\">while<\/span> (<span class=\"hljs-built_in\">fscanf<\/span>(file, <span class=\"hljs-string\">\"%s\"<\/span>, buffer) != EOF) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"%s\\n\"<\/span>, buffer);\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u4f7f\u7528fgets\u51fd\u6570\u9010\u884c\u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u6570\u636e<\/span>\r\n    <span class=\"hljs-comment\">\/\/ fgets\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u7528\u4e8e\u5b58\u50a8\u8bfb\u53d6\u6570\u636e\u7684\u5b57\u7b26\u6570\u7ec4\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u5b57\u7b26\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u4e3a\u6587\u4ef6\u6307\u9488<\/span>\r\n    <span class=\"hljs-comment\">\/\/ fgets\u51fd\u6570\u4f1a\u8bfb\u53d6\u4e00\u884c\u6570\u636e\uff0c\u5305\u62ec\u6362\u884c\u7b26\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u5b57\u7b26\u6570\u7ec4\u4e2d<\/span>\r\n    <span class=\"hljs-comment\">\/\/ \u5f53\u8bfb\u53d6\u5230\u6587\u4ef6\u672b\u5c3e\u65f6\uff0cfgets\u51fd\u6570\u8fd4\u56deNULL<\/span>\r\n    <span class=\"hljs-keyword\">while<\/span> (fgets(buffer, <span class=\"hljs-keyword\">sizeof<\/span>(buffer), file) != <span class=\"hljs-literal\">NULL<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"%s\"<\/span>, buffer);\r\n    }\r\n\r\n    fclose(file); <span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6587\u4ef6<\/span>\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In the above example, the fopen function opens a file named file.txt to read data, using &#8220;r&#8221; as the second parameter to indicate opening the file in read-only mode. If the file is successfully opened, the fopen function returns a file pointer, otherwise it returns NULL.<\/p>\n<p>Using the fscanf function allows for reading data from a file in a specified format, whereas the fgets function can read data from a file line by line.<\/p>\n<p>After reading the data from the file, it is necessary to use the fclose function to close the file and release resources.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C language, you can open a file using the fopen function and read data using the fscanf or fgets function. Here is an example: #include &lt;stdio.h&gt; int main() { FILE *file; \/\/ \u6587\u4ef6\u6307\u9488 char buffer[100]; \/\/ \u7528\u4e8e\u5b58\u50a8\u8bfb\u53d6\u7684\u6570\u636e file = fopen(&#8220;file.txt&#8221;, &#8220;r&#8221;); \/\/ \u6253\u5f00\u540d\u4e3afile.txt\u7684\u6587\u4ef6\u4ee5\u8bfb\u53d6\u6570\u636e if (file == NULL) { \/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u6210\u529f\u6253\u5f00 printf(&#8220;\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6\\n&#8221;); return 1; } [&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-22286","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>How to open a file and read data 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\/how-to-open-a-file-and-read-data-in-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 open a file and read data in C language?\" \/>\n<meta property=\"og:description\" content=\"In C language, you can open a file using the fopen function and read data using the fscanf or fgets function. Here is an example: #include &lt;stdio.h&gt; int main() { FILE *file; \/\/ \u6587\u4ef6\u6307\u9488 char buffer[100]; \/\/ \u7528\u4e8e\u5b58\u50a8\u8bfb\u53d6\u7684\u6570\u636e file = fopen(&quot;file.txt&quot;, &quot;r&quot;); \/\/ \u6253\u5f00\u540d\u4e3afile.txt\u7684\u6587\u4ef6\u4ee5\u8bfb\u53d6\u6570\u636e if (file == NULL) { \/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u6210\u529f\u6253\u5f00 printf(&quot;\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6n&quot;); return 1; } [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-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=\"2024-03-15T23:19:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T22:31:03+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\/how-to-open-a-file-and-read-data-in-c-language\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/\"},\"author\":{\"name\":\"Emily Johnson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3b041b19cffc258705478ecfab895378\"},\"headline\":\"How to open a file and read data in C language?\",\"datePublished\":\"2024-03-15T23:19:24+00:00\",\"dateModified\":\"2024-03-21T22:31:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/\"},\"wordCount\":133,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/\",\"name\":\"How to open a file and read data in C language? 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- Blog - Silicon Cloud","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/","og_locale":"en_US","og_type":"article","og_title":"How to open a file and read data in C language?","og_description":"In C language, you can open a file using the fopen function and read data using the fscanf or fgets function. Here is an example: #include &lt;stdio.h&gt; int main() { FILE *file; \/\/ \u6587\u4ef6\u6307\u9488 char buffer[100]; \/\/ \u7528\u4e8e\u5b58\u50a8\u8bfb\u53d6\u7684\u6570\u636e file = fopen(\"file.txt\", \"r\"); \/\/ \u6253\u5f00\u540d\u4e3afile.txt\u7684\u6587\u4ef6\u4ee5\u8bfb\u53d6\u6570\u636e if (file == NULL) { \/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u6210\u529f\u6253\u5f00 printf(\"\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6n\"); return 1; } [&hellip;]","og_url":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/","og_site_name":"Blog - Silicon Cloud","article_publisher":"https:\/\/www.facebook.com\/SiliCloudGlobal\/","article_published_time":"2024-03-15T23:19:24+00:00","article_modified_time":"2024-03-21T22:31:03+00:00","author":"Emily Johnson","twitter_card":"summary_large_image","twitter_creator":"@SiliCloudGlobal","twitter_site":"@SiliCloudGlobal","twitter_misc":{"Written by":"Emily Johnson","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/#article","isPartOf":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/"},"author":{"name":"Emily Johnson","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3b041b19cffc258705478ecfab895378"},"headline":"How to open a file and read data in C language?","datePublished":"2024-03-15T23:19:24+00:00","dateModified":"2024-03-21T22:31:03+00:00","mainEntityOfPage":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/"},"wordCount":133,"commentCount":0,"publisher":{"@id":"https:\/\/www.silicloud.com\/blog\/#organization"},"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/","url":"https:\/\/www.silicloud.com\/blog\/how-to-open-a-file-and-read-data-in-c-language\/","name":"How to open a file and read data in C language? 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