{"id":13549,"date":"2022-10-04T10:48:45","date_gmt":"2022-10-04T05:18:45","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/"},"modified":"2022-10-04T10:48:45","modified_gmt":"2022-10-04T05:18:45","slug":"solved-why-does-this-recursion-return-0","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/","title":{"rendered":"[Solved] Why does this recursion return 0?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-69196702\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"69196702\" data-parentid=\"69196658\" 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>Your base case is <code>return 0<\/code>. After the line <code>return n * bounce(n - 1)<\/code> where n is 1, <code>bounce(0)<\/code> will be executed, returning 0 and multiplying all your previous results by 0.<\/p>\n<p>Following the calls, we see:<\/p>\n<ul>\n<li>5&gt;=1, so return <code>5*bounce(4)<\/code><\/li>\n<li>4&gt;=1, so return <code>5*4*bounce(3)<\/code><\/li>\n<li>3&gt;=1, so return <code>5*4*3*bounce(2)<\/code><\/li>\n<li>2&gt;=1, so return <code>5*4*3*2*bounce(1)<\/code><\/li>\n<li>1&gt;=1, so return <code>5*4*3*2*1*bounce(0)<\/code><\/li>\n<li>0&lt;1, so return <code>5*4*3*2*1*0<\/code><\/li>\n<\/ul>\n<p>meaning everything gets zeroed out at the end.<br \/>\nYou want the base case to be 1 for that reason.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Why does this recursion return 0? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Your base case is return 0. After the line return n * bounce(n &#8211; 1) where n is 1, bounce(0) will be executed, returning 0 and multiplying all your previous results by 0. Following the calls, we see: 5&gt;=1, so return 5*bounce(4) 4&gt;=1, so return 5*4*bounce(3) 3&gt;=1, so return 5*4*3*bounce(2) 2&gt;=1, so return 5*4*3*2*bounce(1) &#8230; <a title=\"[Solved] Why does this recursion return 0?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/\" aria-label=\"More on [Solved] Why does this recursion return 0?\">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":[413,349,494],"class_list":["post-13549","post","type-post","status-publish","format-standard","hentry","category-solved","tag-function","tag-python","tag-recursion"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Why does this recursion return 0? - 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-does-this-recursion-return-0\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why does this recursion return 0? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Your base case is return 0. After the line return n * bounce(n - 1) where n is 1, bounce(0) will be executed, returning 0 and multiplying all your previous results by 0. Following the calls, we see: 5&gt;=1, so return 5*bounce(4) 4&gt;=1, so return 5*4*bounce(3) 3&gt;=1, so return 5*4*3*bounce(2) 2&gt;=1, so return 5*4*3*2*bounce(1) ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-04T05:18:45+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] Why does this recursion return 0?\",\"datePublished\":\"2022-10-04T05:18:45+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/\"},\"wordCount\":76,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"function\",\"python\",\"recursion\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/\",\"name\":\"[Solved] Why does this recursion return 0? - JassWeb\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#website\"},\"datePublished\":\"2022-10-04T05:18:45+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jassweb.com\/solved\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] Why does this recursion return 0?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jassweb.com\/solved\/#website\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jassweb.com\/solved\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"contentUrl\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"contentUrl\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\/\/jassweb.com\"],\"url\":\"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] Why does this recursion return 0? - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-why-does-this-recursion-return-0\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] Why does this recursion return 0? - JassWeb","og_description":"[ad_1] Your base case is return 0. After the line return n * bounce(n - 1) where n is 1, bounce(0) will be executed, returning 0 and multiplying all your previous results by 0. Following the calls, we see: 5&gt;=1, so return 5*bounce(4) 4&gt;=1, so return 5*4*bounce(3) 3&gt;=1, so return 5*4*3*bounce(2) 2&gt;=1, so return 5*4*3*2*bounce(1) ... 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