{"id":296,"date":"2022-10-04T14:26:18","date_gmt":"2022-10-04T14:26:18","guid":{"rendered":"https:\/\/jassweb.com\/new22\/solved-how-fgets-reads-line-after-line-from-a-file\/"},"modified":"2022-10-04T14:26:18","modified_gmt":"2022-10-04T14:26:18","slug":"solved-how-fgets-reads-line-after-line-from-a-file-2","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/","title":{"rendered":"[Solved] How fgets reads line after line from a file?"},"content":{"rendered":"<h2> Introduction <\/h2>\n<p>[ad_1]<\/p>\n<p>The fgets() function is a powerful tool for reading line-by-line from a file in C programming. It is a standard library function that reads a line from the specified stream and stores it into the string pointed to by the user. This function is useful for reading large files, as it allows the user to read one line at a time, instead of reading the entire file into memory. In this article, we will discuss how fgets reads line after line from a file.<\/p>\n<h2> Solution<\/h2>\n<p><\/p>\n<p>fgets reads line after line from a file by using a loop. The loop reads each line of the file until it reaches the end of the file. The loop reads each line of the file into a buffer, and then processes the line. The loop continues until the end of the file is reached. <\/p>\n<p><\/p>\n<div class=\"entry-content\" itemprop=\"text\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-1088640234840270\" crossorigin=\"anonymous\"><\/script><br \/>\n<script><\/p>\n<p><\/script><\/p>\n<p><\/p>\n<div id=\"answer-33414242\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"33414242\" data-parentid=\"33413953\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>EDIT: added extra explanation as @KlasLindb\u00e4ck pointed out that my answer wasn\u2019t entirely correct <\/p>\n<p>The File is a struct that contains a field \u201cfd\u201d which is an integer that identifies the OS file descriptor of this file, this file descriptor can be used to retrieve the current location in the file you\u2019re reading. If you want more information about the File struct <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.c4learn.com\/c-programming\/c-file-structure-and-file-pointer\/\">here<\/a> and file descriptor <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.wikipedia.org\/wiki\/File_descriptor\">here<\/a> <\/p>\n<p>TL;DR: The FILE struct somehow stores where it\u2019s reading.<\/p>\n<\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p> <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p>\n<\/div>\n<\/div>\n<p>solved How fgets reads line after line from a file? <\/p>\n<p><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-1088640234840270\" crossorigin=\"anonymous\"><\/script><br \/>\n<script><\/p>\n<p><\/script><\/div>\n<p>[ad_2]<\/p>\n<p>When reading a file line by line, the <code>fgets()<\/code> function is often used. This function reads a line from a file and stores it in a string. The string is then used to process the line. The <code>fgets()<\/code> function takes three parameters: the file pointer, the string to store the line, and the maximum length of the line.<\/p>\n<p>The file pointer is used to identify the file that is being read. This is usually done by using the <code>fopen()<\/code> function. The string is used to store the line that is read from the file. The maximum length of the line is used to limit the amount of data that is read from the file. This is important to prevent the program from reading too much data from the file.<\/p>\n<p>The <code>fgets()<\/code> function reads the line from the file one character at a time. It stops reading when it reaches the end of the line or the maximum length of the line. After the line is read, the <code>fgets()<\/code> function returns the string that contains the line. The string can then be used to process the line.<\/p>\n<p>The <code>fgets()<\/code> function can be used to read line after line from a file. This is done by looping through the file and calling the <code>fgets()<\/code> function each time. The loop will continue until the end of the file is reached. This allows the program to process each line of the file one at a time.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction [ad_1] The fgets() function is a powerful tool for reading line-by-line from a file in C programming. It is a standard library function that reads a line from the specified stream and stores it into the string pointed to by the user. This function is useful for reading large files, as it allows the &#8230; <a title=\"[Solved] How fgets reads line after line from a file?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/\" aria-label=\"More on [Solved] How fgets reads line after line from a file?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,932],"class_list":["post-296","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-fgets"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How fgets reads line after line from a file? - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How fgets reads line after line from a file? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"Introduction [ad_1] The fgets() function is a powerful tool for reading line-by-line from a file in C programming. It is a standard library function that reads a line from the specified stream and stores it into the string pointed to by the user. This function is useful for reading large files, as it allows the ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-04T14:26:18+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] How fgets reads line after line from a file?\",\"datePublished\":\"2022-10-04T14:26:18+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/\"},\"wordCount\":479,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"c++\",\"fgets\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/\",\"name\":\"[Solved] How fgets reads line after line from a file? - JassWeb\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#website\"},\"datePublished\":\"2022-10-04T14:26:18+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jassweb.com\/solved\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] How fgets reads line after line from a file?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jassweb.com\/solved\/#website\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jassweb.com\/solved\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"contentUrl\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"contentUrl\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\/\/jassweb.com\"],\"url\":\"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] How fgets reads line after line from a file? - JassWeb","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:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] How fgets reads line after line from a file? - JassWeb","og_description":"Introduction [ad_1] The fgets() function is a powerful tool for reading line-by-line from a file in C programming. It is a standard library function that reads a line from the specified stream and stores it into the string pointed to by the user. This function is useful for reading large files, as it allows the ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/","og_site_name":"JassWeb","article_published_time":"2022-10-04T14:26:18+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] How fgets reads line after line from a file?","datePublished":"2022-10-04T14:26:18+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/"},"wordCount":479,"commentCount":0,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":["c++","fgets"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/","url":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/","name":"[Solved] How fgets reads line after line from a file? - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-10-04T14:26:18+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-how-fgets-reads-line-after-line-from-a-file-2\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] How fgets reads line after line from a file?"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/296","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=296"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/296\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=296"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=296"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=296"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}