{"id":10082,"date":"2022-09-22T05:12:38","date_gmt":"2022-09-21T23:42:38","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-initializing-char-a-new-charsize-does-not-work\/"},"modified":"2022-09-22T05:12:38","modified_gmt":"2022-09-21T23:42:38","slug":"solved-initializing-char-a-new-charsize-does-not-work","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-initializing-char-a-new-charsize-does-not-work\/","title":{"rendered":"[Solved] initializing char* a = new char[size] does not work"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-54157570\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"54157570\" data-parentid=\"54156796\" data-score=\"0\" data-position-on-page=\"4\" 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<p>You are not null-terminating your <code>mString<\/code> data, but it is expecting to be null-terminated when you pass it to <code>std::cout<\/code>. Without that terminator, <code>std::cout<\/code> reads into surrounding memory until it encounters a random null byte (or crashes with a read access error). That is why you are seeing <code>std::cout<\/code> output random garbage after your data. <\/p>\n<p>You are also not following the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.cppreference.com\/w\/cpp\/language\/rule_of_three\">Rule of 3\/5\/0<\/a>, as you are missing a default constructor, copy and move constructors, and copy and move assignment operators.<\/p>\n<p>Try this:<\/p>\n<pre><code>class Practice\n{\npublic:\n    Practice(const char* a = nullptr);\n    Practice(const Practice &amp;src);\n    Practice(Practice &amp;&amp;src);\n    ~Practice();\n\n    Practice&amp; operator=(Practice src);\n\n    const char* getString() const;\n\nprivate:\n    char* mString;\n    int mSize;\n};\n<\/code><\/pre>\n<\/p>\n<pre><code>#include \"Practice.h\"\n#include &lt;utility&gt;\n\nPractice::Practice(const char * a)\n    : mSize(0)\n    , mString(nullptr)\n{\n    if (a)\n    {\n        while (a[mSize] != '\\0')\n        {\n            ++mSize;\n        }\n    }\n\n    mString = new char[mSize + 1];\n\n    for (int i = 0; i &lt; mSize; ++i)\n    {\n        mString[i] = a[i];\n    }\n\n    mString[mSize] = '\\0';\n}\n\nPractice::Practice(const Practice &amp;src)\n    : mSize(src.mSize)\n    , mString(nullptr)\n{\n    mString = new char[mSize + 1];\n\n    for (int i = 0; i &lt; mSize; ++i)\n    {\n        mString[i] = src.mString[i];\n    }\n\n    mString[mSize] = '\\0';\n}\n\nPractice::Practice(Practice &amp;&amp;src)\n    : mSize(src.mSize)\n    , mString(src.mString)\n{\n    src.mString = nullptr;\n    src.mSize = 0;\n}\n\nPractice::~Practice()\n{\n    delete[] mString;\n}\n\nPractice&amp; Practice::operator=(Practice src)\n{\n    std::swap(mString, src.mString);\n    std::swap(mSize, src.mSize);\n    return *this;\n}\n\nconst char* Practice::getString() const\n{\n    return mString;\n}\n<\/code><\/pre>\n<\/p>\n<pre><code>#include &lt;iostream&gt;\n#include \"Practice.h\" \n\nint main()\n{\n    Practice p(\"Hello\");\n\n    std::cout &lt;&lt; p.getString() &lt;&lt; std::endl;\n\n    return 0;\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 initializing char* a = new char[size] does not work <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You are not null-terminating your mString data, but it is expecting to be null-terminated when you pass it to std::cout. Without that terminator, std::cout reads into surrounding memory until it encounters a random null byte (or crashes with a read access error). That is why you are seeing std::cout output random garbage after your &#8230; <a title=\"[Solved] initializing char* a = new char[size] does not work\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-initializing-char-a-new-charsize-does-not-work\/\" aria-label=\"More on [Solved] initializing char* a = new char[size] does not work\">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-10082","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] initializing char* a = new char[size] does not work - 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-initializing-char-a-new-charsize-does-not-work\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] initializing char* a = new char[size] does not work - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You are not null-terminating your mString data, but it is expecting to be null-terminated when you pass it to std::cout. 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