{"id":10014,"date":"2024-03-14T10:27:05","date_gmt":"2024-03-14T10:27:05","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-edit-data-in-a-txt-file-using-the-c-language\/"},"modified":"2025-08-03T18:08:46","modified_gmt":"2025-08-03T18:08:46","slug":"how-to-edit-data-in-a-txt-file-using-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-edit-data-in-a-txt-file-using-the-c-language\/","title":{"rendered":"Edit TXT Files in C: Full Guide"},"content":{"rendered":"<p>To modify the data in a txt file, you can use the file operation functions in C language. Below is a simple example code demonstrating how to modify data in a txt file.<\/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<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdlib.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;string.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;\r\n    <span class=\"hljs-type\">char<\/span> filename[] = <span class=\"hljs-string\">\"example.txt\"<\/span>;\r\n    <span class=\"hljs-type\">char<\/span> data[<span class=\"hljs-number\">1000<\/span>];\r\n    <span class=\"hljs-type\">char<\/span> newData[] = <span class=\"hljs-string\">\"New Data to be written\"<\/span>;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u6253\u5f00\u6587\u4ef6\u4ee5\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c<\/span>\r\n    file = fopen(filename, <span class=\"hljs-string\">\"r+\"<\/span>);\r\n    <span class=\"hljs-keyword\">if<\/span> (file == <span class=\"hljs-literal\">NULL<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Error opening file.\"<\/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\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u6570\u636e<\/span>\r\n    fgets(data, <span class=\"hljs-keyword\">sizeof<\/span>(data), file);\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Original data: %s\\n\"<\/span>, data);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u5c06\u6587\u4ef6\u6307\u9488\u91cd\u65b0\u5b9a\u4f4d\u5230\u6587\u4ef6\u5f00\u5934<\/span>\r\n    fseek(file, <span class=\"hljs-number\">0<\/span>, SEEK_SET);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u5199\u5165\u65b0\u7684\u6570\u636e\u5230\u6587\u4ef6\u4e2d<\/span>\r\n    <span class=\"hljs-built_in\">fputs<\/span>(newData, file);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6587\u4ef6<\/span>\r\n    fclose(file);\r\n\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Data in file has been modified.\\n\"<\/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 this sample code, we first open a file named &#8220;example.txt&#8221;, then read and output the data in the file. Next, we reposition the file pointer to the beginning of the file and write new data &#8220;New Data to be written&#8221; into the file. Finally, we close the file and output the modified information.<\/p>\n<p>Please note that this is just a simple example code and in actual applications, more error handling and data processing logic may be needed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To modify the data in a txt file, you can use the file operation functions in C language. Below is a simple example code demonstrating how to modify data in a txt file. #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string.h&gt; int main() { FILE *file; char filename[] = &#8220;example.txt&#8221;; char data[1000]; char newData[] = &#8220;New Data [&hellip;]<\/p>\n","protected":false},"author":7,"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":[381,450,890,951,6620],"class_list":["post-10014","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-programming","tag-c-tutorial","tag-file-handling","tag-file-operations","tag-text-files"],"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>Edit TXT Files in C: Full Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn to modify text files in C with step-by-step code examples. 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