{"id":17247,"date":"2022-10-23T16:17:11","date_gmt":"2022-10-23T10:47:11","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-define-a-multidimensional-array-in-c-with-n-rows-and-m-columns-and-iterate-values-using-for-loop\/"},"modified":"2022-10-23T16:17:11","modified_gmt":"2022-10-23T10:47:11","slug":"solved-how-to-define-a-multidimensional-array-in-c-with-n-rows-and-m-columns-and-iterate-values-using-for-loop","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-define-a-multidimensional-array-in-c-with-n-rows-and-m-columns-and-iterate-values-using-for-loop\/","title":{"rendered":"[Solved] How to define a multidimensional array in C++ with &#8216;n&#8217; rows and &#8216;m&#8217; columns and iterate values using For Loop?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-68933514\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"68933514\" data-parentid=\"68933036\" data-score=\"0\" 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>You can&#8217;t declare the array unknown size. You must do it dynamically.<\/p>\n<pre><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main()\n{\n    int n = 0, m = 0;\n\n    \/\/. Get the matrix's size\n    while (true)\n    {\n        cout &lt;&lt; \"Input the row count: \"; cin &gt;&gt; n;\n        cout &lt;&lt; \"Input the column count: \"; cin &gt;&gt; m;\n\n        if (n &lt; 1 || m &lt; 1)\n        {\n            cout &lt;&lt; \"Invalid values. Please retry.\" &lt;&lt; endl;\n            continue;\n        }\n\n        break;\n    }\n\n    \/\/. Allocate multi-dimensional array dynamically.\n    int ** mat = new int *[n];\n    for (int i = 0; i &lt; n; i++)\n    {\n        mat[i] = new int[m];\n    }\n\n    \/\/. Receive the elements.\n    for (int i = 0; i &lt; n; i++)\n    {\n        for (int j = 0; j &lt; m; j++)\n        {\n            cout &lt;&lt; \"Input the element of (\" &lt;&lt; i + 1 &lt;&lt; \",\" &lt;&lt; j + 1 &lt;&lt; \"): \";\n            cin &gt;&gt; mat[i][j];\n        }\n    }\n\n    \/\/. Print matrix.\n    cout &lt;&lt; endl &lt;&lt; \"Your matrix:\" &lt;&lt; endl;\n    for (int i = 0; i &lt; n; i++)\n    {       \n        for (int j = 0; j &lt; m; j++)\n        {\n            cout &lt;&lt; mat[i][j] &lt;&lt; \"\\t\";\n        }\n        cout &lt;&lt; std::endl;\n    }\n\n    \/\/. Free memories.\n    for (int i = 0; i &lt; n; i++)\n    {\n        delete[] mat[i];\n    }\n    delete[] mat;\n\n    return 0;\n}\n<\/code><\/pre>\n<p>If you like to use stl, it can be simple.<\/p>\n<pre><code>#include &lt;iostream&gt;\n#include &lt;vector&gt;\nusing namespace std;\n\nusing ROW = vector&lt;int&gt;;\nusing MATRIX = vector&lt;ROW&gt;;\n\nint main()\n{\n    int n = 0, m = 0;\n    MATRIX mat;\n\n    cin &gt;&gt; n &gt;&gt; m;\n\n    for (int i = 0; i &lt; n; i++)\n    {\n        ROW row;\n        row.resize(m);\n\n        for (int j = 0; j &lt; m; j++)\n        {\n            cin &gt;&gt; row[j];\n        }\n        mat.push_back(row);\n    }\n\n    for (auto &amp; row : mat)\n    {\n        for (auto &amp; iter : row)\n        {\n            cout &lt;&lt; iter &lt;&lt; \"\\t\";\n        }\n        cout &lt;&lt; endl;\n    }\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\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to define a multidimensional array in C++ with &#8216;n&#8217; rows and &#8216;m&#8217; columns and iterate values using For Loop? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You can&#8217;t declare the array unknown size. You must do it dynamically. #include &lt;iostream&gt; using namespace std; int main() { int n = 0, m = 0; \/\/. Get the matrix&#8217;s size while (true) { cout &lt;&lt; &#8220;Input the row count: &#8220;; cin &gt;&gt; n; cout &lt;&lt; &#8220;Input the column count: &#8220;; cin &gt;&gt; &#8230; <a title=\"[Solved] How to define a multidimensional array in C++ with &#8216;n&#8217; rows and &#8216;m&#8217; columns and iterate values using For Loop?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-define-a-multidimensional-array-in-c-with-n-rows-and-m-columns-and-iterate-values-using-for-loop\/\" aria-label=\"More on [Solved] How to define a multidimensional array in C++ with &#8216;n&#8217; rows and &#8216;m&#8217; columns and iterate values using For Loop?\">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":[361,324,1695],"class_list":["post-17247","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-c","tag-c17"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to define a multidimensional array in C++ with &#039;n&#039; rows and &#039;m&#039; columns and iterate values using For Loop? - 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-how-to-define-a-multidimensional-array-in-c-with-n-rows-and-m-columns-and-iterate-values-using-for-loop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to define a multidimensional array in C++ with &#039;n&#039; rows and &#039;m&#039; columns and iterate values using For Loop? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You can&#8217;t declare the array unknown size. 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