{"id":28715,"date":"2023-01-02T04:51:31","date_gmt":"2023-01-01T23:21:31","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-c-multiplication-identity-how-do-i-get-it-to-do-that-closed\/"},"modified":"2023-01-02T04:51:31","modified_gmt":"2023-01-01T23:21:31","slug":"solved-c-multiplication-identity-how-do-i-get-it-to-do-that-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-c-multiplication-identity-how-do-i-get-it-to-do-that-closed\/","title":{"rendered":"[Solved] C# : multiplication identity, How do i get it to do that? [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-26194664\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"26194664\" data-parentid=\"26194630\" 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>First, there appears to be a typo in your question. Apparently your formula isn&#8217;t <code>A^2-B^2=(A-B)+(A+B)<\/code>, as the beginning of your question suggests; the example shown is doing multiplication on the right-hand side of the equation.<\/p>\n<p>Here&#8217;s a very basic example of how to do this.<\/p>\n<pre><code>int a = ReadInt(\"Enter value for A: \"); \/\/ see end of answer for `ReadInt` definitions\nint b = ReadInt(\"Enter value for B: \");\n\nConsole.WriteLine(\"{0}^2-{1}^2=({0}-{1})*({0}+{1})\", a, b);\nConsole.WriteLine(\"{0}-{1} = ({2})*({3})\", a * a, b * b, a - b, a + b);\nConsole.WriteLine(\"{0} = {1}\", a * a - b * b, (a - b) * (a + b));\n<\/code><\/pre>\n<p>The <code>{0}<\/code>, <code>{1}<\/code>, etc. in the output text are placeholders. They are explained in the MSDN article <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/msdn.microsoft.com\/en-us\/library\/txafckwd.aspx\" title=\"MSDN article\">&#8220;Composite Formatting&#8221;<\/a>. Basically, the zero-based numbers inside the curly brackets specify which of the arguments after the format text (first argument to <code>Console.WriteLine<\/code>) will be printed in their place.<\/p>\n<p>The above code makes a reference to some <code>ReadInt<\/code> method. Here are two possible definitions for it:<\/p>\n<ul>\n<li>\n<p>Unsafe, non-validating variant which will throw an exception if the users enters something other than an in-range integral number:<\/p>\n<pre><code>static int ReadInt(string prompt)\n{\n    Console.Write(prompt);\n    return int.Parse(Console.ReadLine());\n}\n<\/code><\/pre>\n<\/li>\n<li>\n<p>Safer, validating variant:<\/p>\n<pre><code>static int ReadInt(string prompt)\n{\n    for (;;)\n    {\n        Console.Write(prompt);\n        int result;\n        if (int.TryParse(Console.ReadLine(), out result))\n        {\n            return result;\n        }\n        else\n        {\n            Console.WriteLine(\"Invalid input! Please enter an integral number.\");\n        }\n    }\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">5<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved C# : multiplication identity, How do i get it to do that? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] First, there appears to be a typo in your question. Apparently your formula isn&#8217;t A^2-B^2=(A-B)+(A+B), as the beginning of your question suggests; the example shown is doing multiplication on the right-hand side of the equation. Here&#8217;s a very basic example of how to do this. int a = ReadInt(&#8220;Enter value for A: &#8220;); \/\/ &#8230; <a title=\"[Solved] C# : multiplication identity, How do i get it to do that? [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-c-multiplication-identity-how-do-i-get-it-to-do-that-closed\/\" aria-label=\"More on [Solved] C# : multiplication identity, How do i get it to do that? [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],"class_list":["post-28715","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] C# : multiplication identity, How do i get it to do that? 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