{"id":31986,"date":"2023-01-26T01:34:32","date_gmt":"2023-01-25T20:04:32","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-count-the-number-of-occurrences-of-all-the-digits-in-the-string-s\/"},"modified":"2023-01-26T01:34:32","modified_gmt":"2023-01-25T20:04:32","slug":"solved-count-the-number-of-occurrences-of-all-the-digits-in-the-string-s","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-count-the-number-of-occurrences-of-all-the-digits-in-the-string-s\/","title":{"rendered":"[Solved] Count the number of occurrences of all the digits in the string S.?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-56846555\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"56846555\" data-parentid=\"56841677\" data-score=\"2\" 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>Since after one day all the comments and answers so far obviously could not help you, see the following simple solution.<\/p>\n<p>The exercise targets people starting with C++, so I suppose it is better to use basic constructs like arrays and loops. <\/p>\n<p>The array <code>counts<\/code> holds the counts of the digits, one for each possible digit; so the size of the array is 10. Note that the characters in the string are <em>not integral digits<\/em> from 0..9, but <em>characters<\/em> in (very likely) ASCII code from 48..57. The ASCII-code of character &#8216;0&#8217; is integral value 48, not integral value 0. So to get a range from 0..9, one has to substract 48 (or &#8216;0&#8217;, which is the same as integral 48) from the respective character.<br \/>\nHope it helps.<\/p>\n<pre><code>#include &lt;iostream&gt;\n#include &lt;string&gt;\n\nint main() {\n\n    std::string s = \"7714\";\n    int counts[10] =  { 0 };  \/\/ init all the counters with 0\n    for (int i=0; i&lt;s.length();i++) {  \/\/ iterate over the characters in s\n        char c = s[i];\n        if (isdigit(c)) {\n            int index = c - '0'; \/\/ c is from '0' to '9' (i.e. ASCII codes 48..57); need it from 0..9; char('0') stands for int(49).\n            counts[index]++;  \/\/ increment the counter representing the respective digit\n        } else {\n            std::cout &lt;&lt; \"invalid character (not a digit) in s\" &lt;&lt; std::endl;\n        }\n    }\n    for (int i=0; i&lt;9; i++) {\n        std::cout &lt;&lt; i &lt;&lt; \": \" &lt;&lt; counts[i] &lt;&lt; std::endl;\n    }\n}\n<\/code><\/pre>\n<p>Output:<\/p>\n<pre><code>0: 0\n1: 1\n2: 0\n3: 0\n4: 1\n5: 0\n6: 0\n7: 2\n8: 0\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Count the number of occurrences of all the digits in the string S.? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Since after one day all the comments and answers so far obviously could not help you, see the following simple solution. The exercise targets people starting with C++, so I suppose it is better to use basic constructs like arrays and loops. The array counts holds the counts of the digits, one for each &#8230; <a title=\"[Solved] Count the number of occurrences of all the digits in the string S.?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-count-the-number-of-occurrences-of-all-the-digits-in-the-string-s\/\" aria-label=\"More on [Solved] Count the number of occurrences of all the digits in the string S.?\">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":[324,362],"class_list":["post-31986","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-string"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Count the number of occurrences of all the digits in the string S.? - 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-count-the-number-of-occurrences-of-all-the-digits-in-the-string-s\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Count the number of occurrences of all the digits in the string S.? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Since after one day all the comments and answers so far obviously could not help you, see the following simple solution. 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