{"id":25383,"date":"2022-12-09T20:30:22","date_gmt":"2022-12-09T15:00:22","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-difference-in-the-printfs-below\/"},"modified":"2022-12-09T20:30:22","modified_gmt":"2022-12-09T15:00:22","slug":"solved-please-explain-the-difference-in-the-printfs-below","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-difference-in-the-printfs-below\/","title":{"rendered":"[Solved] Please explain the difference in the printfs below"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-36909379\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"36909379\" data-parentid=\"36909273\" data-score=\"1\" 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><code>%x<\/code> format specifier experts the argument to be of type <code>unsigned int<\/code>.<\/p>\n<p>In your case,<\/p>\n<pre><code> printf(\"%x\\n\",(const uint8_t)0x0D);\n printf(\"%x\\n\",0x0D);\n<\/code><\/pre>\n<p>arguments will be promoted (default promotion rule) to match the type, but in case of<\/p>\n<pre><code> printf(\"%x\\n\",(const uint8_t *)0x0D);  \/\/supplying a pointer\n printf(\"%x\\n\",(uint8_t *)0x0D);        \/\/supplying a pointer\n<\/code><\/pre>\n<p>You&#8217;ll invoke <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.wikipedia.org\/wiki\/Undefined_behavior\">undefined behavior<\/a>, as per <code>C11<\/code>, chapter \u00a77.21.6.1<\/p>\n<blockquote>\n<p>[&#8230;] If any argument is<br \/>\n  not the correct type for the corresponding conversion specification, the behavior is<br \/>\n  undefined. [&#8230;]<\/p>\n<\/blockquote><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">11<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Please explain the difference in the printfs below <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] %x format specifier experts the argument to be of type unsigned int. In your case, printf(&#8220;%x\\n&#8221;,(const uint8_t)0x0D); printf(&#8220;%x\\n&#8221;,0x0D); arguments will be promoted (default promotion rule) to match the type, but in case of printf(&#8220;%x\\n&#8221;,(const uint8_t *)0x0D); \/\/supplying a pointer printf(&#8220;%x\\n&#8221;,(uint8_t *)0x0D); \/\/supplying a pointer You&#8217;ll invoke undefined behavior, as per C11, chapter \u00a77.21.6.1 [&#8230;] &#8230; <a title=\"[Solved] Please explain the difference in the printfs below\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-difference-in-the-printfs-below\/\" aria-label=\"More on [Solved] Please explain the difference in the printfs below\">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":[324,1202,584],"class_list":["post-25383","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-format-specifiers","tag-printf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Please explain the difference in the printfs below - 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-please-explain-the-difference-in-the-printfs-below\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Please explain the difference in the printfs below - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] %x format specifier experts the argument to be of type unsigned int. In your case, printf(&quot;%xn&quot;,(const uint8_t)0x0D); printf(&quot;%xn&quot;,0x0D); arguments will be promoted (default promotion rule) to match the type, but in case of printf(&quot;%xn&quot;,(const uint8_t *)0x0D); \/\/supplying a pointer printf(&quot;%xn&quot;,(uint8_t *)0x0D); \/\/supplying a pointer You&#8217;ll invoke undefined behavior, as per C11, chapter \u00a77.21.6.1 [&#8230;] ... 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