{"id":27403,"date":"2022-12-24T05:52:10","date_gmt":"2022-12-24T00:22:10","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-needed-help-i-c\/"},"modified":"2022-12-24T05:52:10","modified_gmt":"2022-12-24T00:22:10","slug":"solved-needed-help-i-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-needed-help-i-c\/","title":{"rendered":"[Solved] Needed help i C"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-33325527\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"33325527\" data-parentid=\"33322825\" 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>given this code:<\/p>\n<pre><code>void matr(int arr[max][max], int n, int m)\n{\n\n    int i;\n    int k;\n\n    for (i = 0, k = m * n; i &lt; k; i++)\n    {\n        arr[i \/ m][i % m] = rand() % 10 * (pow(-1, rand() % 10));\n    }\n}\n<\/code><\/pre>\n<p>here is an explanation:<\/p>\n<pre><code>1) MAX must be a #define or enum value  \n   cannot be sure of which as that detail was not posted\n\n2) `int arr[max][max]` is a pointer to a 2D array\n   with max rows and max columns\n\n3) `int n, int m` we can assume are the number or rows and columns to be filled in\n   unfortunately with such extremely poor\/meaningless parameter names\n   it is difficult to be sure of their meaning.\n   Also, both 'n' and 'm' must be &lt;= 'max'\n\n4) `int k;` should really have been: `int k = m*n;`\n   and that calculation not placed in the 'for() statement, first parameter.\n   why the whole 2D matrix is not being filled is a good\/unanswered question.\n\n5) `for (i = 0, k = m * n; i &lt; k; i++)`  means loop m*n times with loop counter 'i'\n\n6) `arr[i \/ m][i % m]`  this is a calculation of which row\/column\n   to place the produced value into.\n   notice that this fills the matrix a row at a time\n   however, if 'm' is not equal to 'n' then this calculation is flawed\n\n7) `rand() % 10` get a number in the range 0...9 inclusive\n\n8) `rand() % 10)` get a number in the range 0...9 inclusive\n\n9) `(pow(-1, rand() % 10)` get the -1 to the 0...9 (inclusive) power\n   which will produce both positive and negative values \n   depending on if the 'power' value is even or odd\n<\/code><\/pre>\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 Needed help i C <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] given this code: void matr(int arr[max][max], int n, int m) { int i; int k; for (i = 0, k = m * n; i &lt; k; i++) { arr[i \/ m][i % m] = rand() % 10 * (pow(-1, rand() % 10)); } } here is an explanation: 1) MAX must be a &#8230; <a title=\"[Solved] Needed help i C\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-needed-help-i-c\/\" aria-label=\"More on [Solved] Needed help i C\">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-27403","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] Needed help i C - 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-needed-help-i-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Needed help i C - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] given this code: void matr(int arr[max][max], int n, int m) { int i; int k; for (i = 0, k = m * n; i &lt; k; i++) { arr[i \/ m][i % m] = rand() % 10 * (pow(-1, rand() % 10)); } } here is an explanation: 1) MAX must be a ... 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