{"id":15114,"date":"2024-03-15T10:35:08","date_gmt":"2024-03-15T10:35:08","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-read-the-content-of-a-text-file-in-c\/"},"modified":"2025-08-06T15:52:10","modified_gmt":"2025-08-06T15:52:10","slug":"how-to-read-the-content-of-a-text-file-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-read-the-content-of-a-text-file-in-c\/","title":{"rendered":"How to read the content of a text file in C++?"},"content":{"rendered":"<p>In C++, you can use the ifstream class to read the contents of a text file. Here is a simple example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;iostream&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;fstream&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;string&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    <span class=\"hljs-function\">std::ifstream <span class=\"hljs-title\">file<\/span><span class=\"hljs-params\">(<span class=\"hljs-string\">\"example.txt\"<\/span>)<\/span><\/span>; <span class=\"hljs-comment\">\/\/ \u6253\u5f00\u6587\u4ef6<\/span>\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (file.<span class=\"hljs-built_in\">is_open<\/span>()) { <span class=\"hljs-comment\">\/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u6210\u529f\u6253\u5f00<\/span>\r\n        std::string line;\r\n        <span class=\"hljs-keyword\">while<\/span> (std::<span class=\"hljs-built_in\">getline<\/span>(file, line)) { <span class=\"hljs-comment\">\/\/ \u9010\u884c\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/span>\r\n            std::cout &lt;&lt; line &lt;&lt; std::endl; <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\u6bcf\u4e00\u884c\u7684\u5185\u5bb9<\/span>\r\n        }\r\n        file.<span class=\"hljs-built_in\">close<\/span>(); <span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6587\u4ef6<\/span>\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        std::cout &lt;&lt; <span class=\"hljs-string\">\"\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6\"<\/span> &lt;&lt; std::endl;\r\n    }\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 code above, an input file stream object &#8220;file&#8221; is created using the std::ifstream class, and the file name to be opened is passed to it through the constructor.<\/p>\n<p>Then, you can use the is_open() function to check if the file was successfully opened. If the file was successfully opened, you can use the std::getline() function to read the content of the file line by line.<\/p>\n<p>Finally, use std::cout to display the content of each line and close the file using the close() function after reading. If the file cannot be opened, output the corresponding error message.<\/p>\n<p>Note: When actually using it, be sure to change &#8220;example.txt&#8221; to the appropriate file name based on the file&#8217;s path and name.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C++, you can use the ifstream class to read the contents of a text file. Here is a simple example: #include &lt;iostream&gt; #include &lt;fstream&gt; #include &lt;string&gt; int main() { std::ifstream file(&#8220;example.txt&#8221;); \/\/ \u6253\u5f00\u6587\u4ef6 if (file.is_open()) { \/\/ \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u6210\u529f\u6253\u5f00 std::string line; while (std::getline(file, line)) { \/\/ \u9010\u884c\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9 std::cout &lt;&lt; line &lt;&lt; std::endl; \/\/ \u8f93\u51fa\u6bcf\u4e00\u884c\u7684\u5185\u5bb9 } [&hellip;]<\/p>\n","protected":false},"author":14,"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":[453,1402,299,1404,1403],"class_list":["post-15114","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"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 read the content of a text file in C++? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about how to read the content of a text file in c++?. 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