{"id":29449,"date":"2023-01-07T20:10:03","date_gmt":"2023-01-07T14:40:03","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-d%ce%bfes-this-code-output-1\/"},"modified":"2023-01-07T20:10:03","modified_gmt":"2023-01-07T14:40:03","slug":"solved-why-d%ce%bfes-this-code-output-1","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-d%ce%bfes-this-code-output-1\/","title":{"rendered":"[Solved] Why d\u03bfes this code output 1?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-51033823\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"51033823\" data-parentid=\"51033802\" data-score=\"2\" 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>The code can be roughly translated to the English:<\/p>\n<blockquote>\n<p>Start with a sum of zero then, for every number from 0 to 9 inclusive, add it to the sum if and only if the current sum is even.<\/p>\n<\/blockquote>\n<p>So, you&#8217;ll add zero to the sum (because the sum is currently even) after which the sum will still be zero (hence even).<\/p>\n<p>Then you&#8217;ll add one to the sum (because the sum is currently even) after which the sum will be one (hence odd).<\/p>\n<p>Then you&#8217;ll never add anything to the sum again (because it&#8217;s odd and will remain so because you&#8217;re not adding anything to it).<\/p>\n<p><em>That&#8217;s<\/em> why it outputs one.<\/p>\n<hr>\n<p>You may find it more instructive to simply modify your program to output what it&#8217;s &#8220;thinking&#8221;. The following changes will hopefully make it easier to understand:<\/p>\n<pre><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main(void) {\n    int sum = 0;\n    for (int i = 0; i &lt; 10; i++) {\n        cout &lt;&lt; \"Processing \" &lt;&lt; i\n             &lt;&lt; \", sum is \" &lt;&lt; sum\n             &lt;&lt; ((sum % 2 == 0) ? \" (even):\" : \" (odd): \");\n        if (sum % 2 == 0) {\n            sum += i;\n            cout &lt;&lt; \"adding \" &lt;&lt; i &lt;&lt; \" to get \" &lt;&lt; sum;\n        } else {\n            cout &lt;&lt; \"leaving at \" &lt;&lt; sum;\n        }\n        cout &lt;&lt; '\\n';\n    }\n    cout &lt;&lt; \"Final value is \" &lt;&lt; sum &lt;&lt; '\\n';\n}\n<\/code><\/pre>\n<p>Running that code will show you the steps along the way:<\/p>\n<pre><code>Processing 0, sum is 0 (even): adding 0 to get 0\nProcessing 1, sum is 0 (even): adding 1 to get 1\nProcessing 2, sum is 1 (odd):  leaving at 1\nProcessing 3, sum is 1 (odd):  leaving at 1\nProcessing 4, sum is 1 (odd):  leaving at 1\nProcessing 5, sum is 1 (odd):  leaving at 1\nProcessing 6, sum is 1 (odd):  leaving at 1\nProcessing 7, sum is 1 (odd):  leaving at 1\nProcessing 8, sum is 1 (odd):  leaving at 1\nProcessing 9, sum is 1 (odd):  leaving at 1\nFinal value is 1\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 Why d\u03bfes this code output 1? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] The code can be roughly translated to the English: Start with a sum of zero then, for every number from 0 to 9 inclusive, add it to the sum if and only if the current sum is even. So, you&#8217;ll add zero to the sum (because the sum is currently even) after which the &#8230; <a title=\"[Solved] Why d\u03bfes this code output 1?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-why-d%ce%bfes-this-code-output-1\/\" aria-label=\"More on [Solved] Why d\u03bfes this code output 1?\">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-29449","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] Why d\u03bfes this code output 1? - 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-why-d\u03bfes-this-code-output-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why d\u03bfes this code output 1? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The code can be roughly translated to the English: Start with a sum of zero then, for every number from 0 to 9 inclusive, add it to the sum if and only if the current sum is even. 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