{"id":33512,"date":"2023-02-09T09:35:26","date_gmt":"2023-02-09T04:05:26","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-does-my-program-crash-if-i-dont-give-command-line-arguments-to-it-closed\/"},"modified":"2023-02-09T09:35:26","modified_gmt":"2023-02-09T04:05:26","slug":"solved-why-does-my-program-crash-if-i-dont-give-command-line-arguments-to-it-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-does-my-program-crash-if-i-dont-give-command-line-arguments-to-it-closed\/","title":{"rendered":"[Solved] Why does my program crash if I don&#8217;t give command line arguments to it? [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-14404663\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"14404663\" data-parentid=\"14404626\" data-score=\"7\" 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>It crashes because you are accessing<\/p>\n<pre><code>argv[1]\n<\/code><\/pre>\n<p>which would hold a command line argument (other than the program&#8217;s name) if there was one. You should check whether <code>argc<\/code> is greater than 1. Why greater than 1? Because the first command line argument is the name of the program itself. So <code>argc<\/code> is always greater than <code>0<\/code>. And indexing starts at <code>0<\/code>. So if <code>argc == 1<\/code>, only <code>argv[0]<\/code> is valid.<\/p>\n<pre><code>#include &lt;iostream&gt;\nint main(int argc, char* argv[])\n{\n  \/\/ no need to check argc for argv[0]\n  std::cout &lt;&lt; argc &lt;&lt; \" \" &lt;&lt; argv[0] &lt;&lt; \"\\n\";\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Why does my program crash if I don&#8217;t give command line arguments to it? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] It crashes because you are accessing argv[1] which would hold a command line argument (other than the program&#8217;s name) if there was one. You should check whether argc is greater than 1. Why greater than 1? Because the first command line argument is the name of the program itself. So argc is always greater &#8230; <a title=\"[Solved] Why does my program crash if I don&#8217;t give command line arguments to it? [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-why-does-my-program-crash-if-i-dont-give-command-line-arguments-to-it-closed\/\" aria-label=\"More on [Solved] Why does my program crash if I don&#8217;t give command line arguments to it? [closed]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,604,1339,1849],"class_list":["post-33512","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-command-line","tag-command-line-arguments","tag-crash"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Why does my program crash if I don&#039;t give command line arguments to it? [closed] - 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-why-does-my-program-crash-if-i-dont-give-command-line-arguments-to-it-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why does my program crash if I don&#039;t give command line arguments to it? [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] It crashes because you are accessing argv[1] which would hold a command line argument (other than the program&#8217;s name) if there was one. You should check whether argc is greater than 1. Why greater than 1? Because the first command line argument is the name of the program itself. So argc is always greater ... 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