{"id":30100,"date":"2023-01-13T06:44:04","date_gmt":"2023-01-13T01:14:04","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-in-c-why-does-reference-to-single-character-of-stdstring-give-a-number-closed\/"},"modified":"2023-01-13T06:44:04","modified_gmt":"2023-01-13T01:14:04","slug":"solved-in-c-why-does-reference-to-single-character-of-stdstring-give-a-number-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-in-c-why-does-reference-to-single-character-of-stdstring-give-a-number-closed\/","title":{"rendered":"[Solved] In C++ why does reference to single character of std::string give a number [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-16132110\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"16132110\" data-parentid=\"16132017\" 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>On my Debian\/Sid\/x86-64 the below program (in source file <code>itsols.cc<\/code> compiled with the command <code>g++ -Wall itsols.cc -o itsols<\/code>)<\/p>\n<pre><code>#include &lt;iostream&gt;\n#include &lt;string&gt;\n\nint main(int, char**) {\n  std::string s = \"Hello\";\n  std::cout &lt;&lt; s[3] &lt;&lt; std::endl;\n  return 0;\n}  \n<\/code><\/pre>\n<p>displays a single lower-case <code>l<\/code> (compiled with <code>g++ -Wall itsols.cc -o itsols<\/code>, both with GCC 4.7.2 and with GCC 4.8.0 and also with GCC 4.6.3)<\/p>\n<p>So I cannot reproduce what you claim (and I believe you are probably wrong, because when you read C++ reference material the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.cplusplus.com\/reference\/string\/string\/operator%5B%5D\/\">operator [] on strings<\/a> gives a <code>const char&amp;<\/code> result, which is output using <code>std::cout &lt;&lt;<\/code> as a single char, not a number).<\/p>\n<h2>addenda<\/h2>\n<p>Even by taking your [final] example (which is not correct C++ because <code>main<\/code> has a bad signature, and GCC warns about that) I am getting two <code>A<\/code> outputs (and this using either GCC 4.6.3, or GC 4.7.2, or GCC 4.8.0). Also, your example lacks a <code>std::endl<\/code> and a final <code>putchar('\\n'); return 0;<\/code> &#8230;.<\/p>\n<p>Take the habit to always pass <code>-Wall<\/code> to <code>g++<\/code> or <code>gcc<\/code> (also passing <code>-g<\/code> while you debug your program with <code>gdb<\/code>, later optimizing it with  <code>-O2<\/code> when there is no bugs), and also check with <code>g++ -v<\/code> that you are running the compiler you believe, and to get its version.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">4<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved In C++ why does reference to single character of std::string give a number [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] On my Debian\/Sid\/x86-64 the below program (in source file itsols.cc compiled with the command g++ -Wall itsols.cc -o itsols) #include &lt;iostream&gt; #include &lt;string&gt; int main(int, char**) { std::string s = &#8220;Hello&#8221;; std::cout &lt;&lt; s[3] &lt;&lt; std::endl; return 0; } displays a single lower-case l (compiled with g++ -Wall itsols.cc -o itsols, both with GCC &#8230; <a title=\"[Solved] In C++ why does reference to single character of std::string give a number [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-in-c-why-does-reference-to-single-character-of-stdstring-give-a-number-closed\/\" aria-label=\"More on [Solved] In C++ why does reference to single character of std::string give a number [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":[324,558,362,428],"class_list":["post-30100","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-character","tag-string","tag-substring"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] In C++ why does reference to single character of std::string give a number [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-in-c-why-does-reference-to-single-character-of-stdstring-give-a-number-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] In C++ why does reference to single character of std::string give a number [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] On my Debian\/Sid\/x86-64 the below program (in source file itsols.cc compiled with the command g++ -Wall itsols.cc -o itsols) #include &lt;iostream&gt; #include &lt;string&gt; int main(int, char**) { std::string s = &quot;Hello&quot;; std::cout &lt;&lt; s[3] &lt;&lt; std::endl; return 0; } displays a single lower-case l (compiled with g++ -Wall itsols.cc -o itsols, both with GCC ... 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