{"id":14500,"date":"2022-10-08T01:44:08","date_gmt":"2022-10-07T20:14:08","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-does-the-result-of-this-recursive-function-in-java-is-like-that\/"},"modified":"2022-10-08T01:44:08","modified_gmt":"2022-10-07T20:14:08","slug":"solved-why-does-the-result-of-this-recursive-function-in-java-is-like-that","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-does-the-result-of-this-recursive-function-in-java-is-like-that\/","title":{"rendered":"[Solved] why does the result of this recursive function in java is like that"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-72297755\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"72297755\" data-parentid=\"72280020\" 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>Here is a test application to show you the trace of the program&#8217;s execution (requires Java 11 due to the use of <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/en\/java\/javase\/18\/docs\/api\/java.base\/java\/lang\/String.html#repeat(int)\"><code>String#repeat(int)<\/code><\/a>):<\/p>\n<pre class=\"lang-java prettyprint-override\"><code>public class Main {\n\n  private static int depth;\n\n  public static void main(String[] args) {\n    foo(0);\n  }\n\n  public static void foo(int n) {\n    printDebug(\"Invoked foo(\" + n + \")\");\n\n    if (n &lt; 2) {\n      printDebug(\"Recursively call foo(\" + n + \" + 1)\");\n      depth++;\n      foo(n + 1);\n      depth--;\n      printDebug(\"Returned from recursive call of foo(\" + n + \" + 1)\");\n    } else {\n      printDebug(\"Skip recursive call\");\n    }\n\n\n    \/\/ this is the 'System.out.print(n + \" \"); line'\n    printDebug(\"PRINT VALUE OF n AND A SPACE (n=\" + n + \")\");\n\n    if (n &lt; 2) {\n      printDebug(\"Recursively call foo(\" + n + \" + 1)\");\n      depth++;\n      foo(n + 1);\n      depth--;\n      printDebug(\"Returned from recursive call of foo(\" + n  + \" + 1)\");\n    } else {\n      printDebug(\"Skip recursive call\");\n    }\n  }\n\n  private static void printDebug(String msg) {\n    System.out.println(\"    \".repeat(depth) + msg);\n  }\n}\n<\/code><\/pre>\n<p>The recursive function was renamed to <code>foo<\/code> and was slightly modified to accommodate debug statements. When you run the above, the output will be:<\/p>\n<pre class=\"lang-none prettyprint-override\"><code>Invoked foo(0)\nRecursively call foo(0 + 1)\n    Invoked foo(1)\n    Recursively call foo(1 + 1)\n        Invoked foo(2)\n        Skip recursive call\n        PRINT VALUE OF n AND A SPACE (n=2)\n        Skip recursive call\n    Returned from recursive call of foo(1 + 1)\n    PRINT VALUE OF n AND A SPACE (n=1)\n    Recursively call foo(1 + 1)\n        Invoked foo(2)\n        Skip recursive call\n        PRINT VALUE OF n AND A SPACE (n=2)\n        Skip recursive call\n    Returned from recursive call of foo(1 + 1)\nReturned from recursive call of foo(0 + 1)\nPRINT VALUE OF n AND A SPACE (n=0)\nRecursively call foo(0 + 1)\n    Invoked foo(1)\n    Recursively call foo(1 + 1)\n        Invoked foo(2)\n        Skip recursive call\n        PRINT VALUE OF n AND A SPACE (n=2)\n        Skip recursive call\n    Returned from recursive call of foo(1 + 1)\n    PRINT VALUE OF n AND A SPACE (n=1)\n    Recursively call foo(1 + 1)\n        Invoked foo(2)\n        Skip recursive call\n        PRINT VALUE OF n AND A SPACE (n=2)\n        Skip recursive call\n    Returned from recursive call of foo(1 + 1)\nReturned from recursive call of foo(0 + 1)\n<\/code><\/pre>\n<p>The indent of each line shows the current depth of the recursive calls (more indent means deeper recursion). If you look at the order of the <code>PRINT VALUE OF n AND A SPACE (n=#)<\/code> lines, you&#8217;ll see the output of the original recursive function will be:<\/p>\n<pre class=\"lang-none prettyprint-override\"><code>2 1 2 0 2 1 2\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 why does the result of this recursive function in java is like that <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Here is a test application to show you the trace of the program&#8217;s execution (requires Java 11 due to the use of String#repeat(int)): public class Main { private static int depth; public static void main(String[] args) { foo(0); } public static void foo(int n) { printDebug(&#8220;Invoked foo(&#8221; + n + &#8220;)&#8221;); if (n &lt; &#8230; <a title=\"[Solved] why does the result of this recursive function in java is like that\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-why-does-the-result-of-this-recursive-function-in-java-is-like-that\/\" aria-label=\"More on [Solved] why does the result of this recursive function in java is like that\">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":[413,323,494],"class_list":["post-14500","post","type-post","status-publish","format-standard","hentry","category-solved","tag-function","tag-java","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 the result of this recursive function in java is like that - 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-the-result-of-this-recursive-function-in-java-is-like-that\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] why does the result of this recursive function in java is like that - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Here is a test application to show you the trace of the program&#8217;s execution (requires Java 11 due to the use of String#repeat(int)): public class Main { private static int depth; public static void main(String[] args) { foo(0); } public static void foo(int n) { printDebug(&quot;Invoked foo(&quot; + n + &quot;)&quot;); if (n &lt; ... 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