{"id":16724,"date":"2022-10-22T00:09:02","date_gmt":"2022-10-21T18:39:02","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-understanding-special-type-of-access-c-c-array-closed\/"},"modified":"2022-10-22T00:09:02","modified_gmt":"2022-10-21T18:39:02","slug":"solved-understanding-special-type-of-access-c-c-array-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-understanding-special-type-of-access-c-c-array-closed\/","title":{"rendered":"[Solved] Understanding special type of access C++\/C array [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-40367436\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"40367436\" data-parentid=\"40366861\" data-score=\"1\" data-position-on-page=\"2\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" 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<blockquote>\n<p>&#8220;So <code>c<\/code> has to be between <code>0<\/code> and <code>9<\/code>&#8220;<\/p>\n<\/blockquote>\n<p><strong><code>No!<\/code><\/strong> <code>c<\/code> has to be between <code>'0'<\/code> and <code>'9'<\/code>, and it makes the difference.<\/p>\n<p>Every character has appropriate numeric value (ASCII code), e. g.:<\/p>\n<ul>\n<li>&#8216;A&#8217; has 65<\/li>\n<li>&#8216;B&#8217; has 66<\/li>\n<li>&#8216;a&#8217; has 98<\/li>\n<\/ul>\n<p>In C language <strong>characters<\/strong> are simply <strong>numbers<\/strong>, e. g. <code>'A' + 'B'<\/code> is a perfectly valid expression and means <code>65 + 66<\/code>.<\/p>\n<p>If we want display or read a <code>digit<\/code> (0, 1, &#8230;, 9), we actually use its symbolic representation, i. e. an <code>character<\/code> (&#8216;0&#8217;, &#8216;1&#8217;, &#8230;, &#8216;9&#8217;). And these characters amazingly <strong>have not<\/strong> ASCII values 0, 1, &#8230;, 9, but <strong>48, 49, &#8230; 57<\/strong> &#8211; they are all <code>shifted by 48<\/code>.<\/p>\n<p>So for converting a digit <code>symbol<\/code>, e. g. <code>'7'<\/code> (which has ASCII value <code>55<\/code> &#8211; as <code>7 + 48<\/code>) into a <code>number<\/code> which we people see in it (i. e. <code>7<\/code> &#8211; without apostrophes), we need simply subtract this shifting number <code>48<\/code> from its ASCII value:<\/p>\n<pre><code>    (7 + 48) - 48\n<\/code><\/pre>\n<p>which is the same as to subtract <strong>&#8216;0&#8217;<\/strong> (= 48) from <strong>&#8216;7&#8217;<\/strong> (=55):<\/p>\n<pre><code>    '7' - '0'\n<\/code><\/pre>\n<p>and witch is exactly what does the expression<\/p>\n<pre><code>    c - '0'\n<\/code><\/pre>\n<p>in your code.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Understanding special type of access C++\/C array [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] &#8220;So c has to be between 0 and 9&#8220; No! c has to be between &#8216;0&#8217; and &#8216;9&#8217;, and it makes the difference. Every character has appropriate numeric value (ASCII code), e. g.: &#8216;A&#8217; has 65 &#8216;B&#8217; has 66 &#8216;a&#8217; has 98 In C language characters are simply numbers, e. g. &#8216;A&#8217; + &#8216;B&#8217; &#8230; <a title=\"[Solved] Understanding special type of access C++\/C array [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-understanding-special-type-of-access-c-c-array-closed\/\" aria-label=\"More on [Solved] Understanding special type of access C++\/C array [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],"class_list":["post-16724","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Understanding special type of access C++\/C array [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-understanding-special-type-of-access-c-c-array-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Understanding special type of access C++\/C array [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] &#8220;So c has to be between 0 and 9&#8220; No! c has to be between &#039;0&#039; and &#039;9&#039;, and it makes the difference. 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