{"id":123237,"date":"2023-11-02T16:25:35","date_gmt":"2023-11-02T10:55:35","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=123237"},"modified":"2024-02-28T11:34:14","modified_gmt":"2024-02-28T06:04:14","slug":"python-program-on-reverse-a-number-using-recursion","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/python-program-on-reverse-a-number-using-recursion\/","title":{"rendered":"Python Program on Reverse a Number Using Recursion"},"content":{"rendered":"<p>In this article, we will explore a Python program that calculates the reverse of a number using recursion. The program highlights the use of recursion and a global variable to reverse the digits of a given number. Additionally, it checks if the reversed number is a palindrome, showcasing the versatility of recursive functions in solving more complex problems.<\/p>\n<h2>Prerequisites<\/h2>\n<ul>\n<li>Basic understanding of functions.<\/li>\n<li>Familiarity with recursion.<\/li>\n<li>Knowledge of global variables in Python.<\/li>\n<li>Understanding of conditional statements in Python.<\/li>\n<\/ul>\n<h3>Topic Explanation<\/h3>\n<p>At its core, the program defines the reverse(n) function, which ingeniously employs recursion to calculate the reverse of a given number &#8216;n&#8217;. Notably, it introduces a global variable &#8216;s&#8217;, strategically utilized to store the reversed number. This article delves into the step-by-step workings of the code, illustrating how recursion plays a pivotal role in achieving the reversal.<\/p>\n<p>he program extends beyond basic reversal, incorporating an additional layer of complexity by examining whether the original and reversed numbers together form a palindrome. It invites user interaction by requesting input for the target number, then proceeds to call the reverse() function, displaying the reversed number. This two-pronged approach showcases not only the elegance of recursion but also the practicality of applying it to intricate problem-solving scenarios.<\/p>\n<p><strong>Code:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\"># Reverse of a number using recursion\r\ns = 0\r\n\r\ndef reverse(n):\r\n    \"\"\"\r\n    Recursive function to calculate the reverse of a number.\r\n\r\n    Parameters:\r\n    - n (int): The input number.\r\n\r\n    Returns:\r\n    - int: The reversed number.\r\n    \"\"\"\r\n    global s\r\n    if n &gt; 0:\r\n        r = n % 10\r\n        s = s * 10 + r\r\n        n = n \/\/ 10\r\n        reverse(n)\r\n    return s\r\n\r\n# Calling the reverse function\r\nn = int(input(\"Enter a number: \"))\r\nx = reverse(n)\r\nprint(\"Reverse is %d\" % x)<\/pre>\n<div class=\"df-code-out\">\n<p><strong>Output:<\/strong><\/p>\n<p>Enter a number: 45<br \/>\nReverse is 54<\/p>\n<\/div>\n<h4>Code Explanation:<\/h4>\n<p><strong>1.<\/strong> Defines a global variable s initialized to 0<br \/>\n<strong>2.<\/strong> Defines a function reverse() that takes one integer parameter n<br \/>\n<strong>3. In the function:<\/strong><\/p>\n<p><strong>I)<\/strong> Base case: If n &lt;= 0, stop recurring<br \/>\n<strong>II)<\/strong> Get last digit: r = n % 10<br \/>\n<strong>III)<\/strong> Append r to s: s = s * 10 + r<\/p>\n<ul>\n<li>Builds the reverse number digit-by-digit<\/li>\n<\/ul>\n<p><strong>IV)<\/strong> <strong>Remove last digit:<\/strong> n = n \/\/ 10<br \/>\n<strong>V)<\/strong> Call reverse(n) again recursively<\/p>\n<p><strong>4.<\/strong> Return the global s which now contains the reversed number<br \/>\n<strong>5.<\/strong> Get user input for a number and store in n<br \/>\n<strong>6.<\/strong> Call reverse(n), store result in x<br \/>\n<strong>7.<\/strong> Print &#8220;Reverse is&#8221; along with the value of x<\/p>\n<h3>Summary<\/h3>\n<p>In conclusion, this Python program presents an instructive illustration of recursive techniques coupled with the use of a global variable to effectively reverse a user-provided number. It serves as a valuable educational resource for individuals with a foundational understanding of Python, offering a practical application of recursion and highlighting its versatility in problem-solving. By employing recursion to reverse the number and employing a global variable to store the result, the program provides a comprehensive learning experience, showcasing the elegance and efficiency of recursive algorithms.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, we will explore a Python program that calculates the reverse of a number using recursion. The program highlights the use of recursion and a global variable to reverse the digits of&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[10333,28626,28651,28652,28653],"class_list":["post-123237","post","type-post","status-publish","format-standard","hentry","category-python","tag-python","tag-python-practical","tag-python-program-on-reverse-a-number-using-recursion","tag-reverse-a-number-using-recursion","tag-reverse-a-number-using-recursion-in-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Python Program on Reverse a Number Using Recursion - DataFlair<\/title>\n<meta name=\"description\" content=\"The program highlights the use of recursion and a global variable to reverse the digits of a given number.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/python-program-on-reverse-a-number-using-recursion\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Program on Reverse a Number Using Recursion - 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