{"id":18123,"date":"2025-01-27T14:27:38","date_gmt":"2025-01-27T14:27:38","guid":{"rendered":"https:\/\/unp.education\/content\/?p=18123"},"modified":"2025-01-27T14:27:38","modified_gmt":"2025-01-27T14:27:38","slug":"factorial-program-using-while-loop-in-java-article","status":"publish","type":"post","link":"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/","title":{"rendered":"Factorial Program Using While Loop in Java"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"18123\" class=\"elementor elementor-18123\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d3e51ce e-flex e-con-boxed e-con e-parent\" data-id=\"d3e51ce\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8106046 elementor-widget elementor-widget-text-editor\" data-id=\"8106046\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Calculating the factorial of a number is a fundamental concept in programming and plays a significant role in <strong>interview preparation<\/strong>. If you&#8217;re diving into Java, understanding how to implement a <strong>factorial program in Java<\/strong> using a <code>while<\/code> loop is essential. This article will walk you through the process step by step, ensuring clarity and mastery.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Factorial Program Using While Loop in Java<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#What_is_a_Factorial\" >What is a Factorial?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Why_Use_a_While_Loop\" >Why Use a While Loop?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Factorial_Program_in_Java_Using_While_Loop\" >Factorial Program in Java Using While Loop<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Code_Explanation\" >Code Explanation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Code_implementation\" >Code implementation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Analyzing_the_Output\" >Analyzing the Output<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Common_Errors_to_Avoid\" >Common Errors to Avoid<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Factorial_Using_Recursion_in_Java\" >Factorial Using Recursion in Java<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Recursive_Implementation\" >Recursive Implementation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/#FAQs\" >FAQs<\/a><\/li><\/ul><\/nav><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a474aae elementor-hidden-mobile e-flex e-con-boxed e-con e-parent\" data-id=\"a474aae\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-309cab4 e-con-full e-flex e-con e-child\" data-id=\"309cab4\" data-element_type=\"container\" data-e-type=\"container\" 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class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Factorial Program Using While Loop in Java<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-09dcad2 elementor-hidden-desktop elementor-hidden-tablet e-flex e-con-boxed e-con e-parent\" data-id=\"09dcad2\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-af663a4 e-con-full e-flex e-con e-child\" data-id=\"af663a4\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cd03bcd elementor-widget elementor-widget-image\" data-id=\"cd03bcd\" data-element_type=\"widget\" data-e-type=\"widget\" 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https:\/\/unp.education\/content\/wp-content\/uploads\/2024\/10\/UNP-Course_Mastering-DS-ML-3_1731683217900.png 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3efafcb e-con-full e-flex e-con e-child\" data-id=\"3efafcb\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-ac7832b e-con-full e-flex e-con e-child\" data-id=\"ac7832b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-83295a2 elementor-widget elementor-widget-heading\" data-id=\"83295a2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Unlock Your Business Intelligence Potential with Power BI!<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b5d7473 elementor-widget elementor-widget-heading\" data-id=\"b5d7473\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\">Take the next step in your data career with our 6-week comprehensive course, 'Mastering Business Intelligence with Power BI'.\nReady to transform your data skills? Enroll Now and elevate your career with UNP Education!<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-55121ac e-con-full e-flex e-con e-child\" data-id=\"55121ac\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7f96ab3 elementor-widget elementor-widget-button\" data-id=\"7f96ab3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/unp.education\/course-overview\/mastering-buisness-intelligence-with-power-bi\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Join Now<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4e3902c elementor-widget elementor-widget-button\" data-id=\"4e3902c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/unp.education\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Browse Course<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fb1ce35 e-flex e-con-boxed e-con e-parent\" data-id=\"fb1ce35\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0793e5a elementor-widget elementor-widget-heading\" data-id=\"0793e5a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"What_is_a_Factorial\"><\/span>What is a Factorial?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-67fc29f elementor-widget elementor-widget-text-editor\" data-id=\"67fc29f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A factorial is the product of all positive integers up to a given number. Represented as n!, the factorial of a number is obtained by calculating:<br \/>n!=n\u00d7(n\u22121)\u00d7(n\u22122)\u00d7\u2026\u00d71n! = n \\\\times (n-1) \\\\times (n-2) \\\\times \\\\ldots \\\\times 1n!=n\u00d7(n\u22121)\u00d7(n\u22122)\u00d7\u2026\u00d71<br \/>For example:<br \/>5!=5\u00d74\u00d73\u00d72\u00d71=1205! = 5 \\\\times 4 \\\\times 3 \\\\times 2 \\\\times 1 = 1205!=5\u00d74\u00d73\u00d72\u00d71=120<br \/>0!=10! = 10!=1 (by definition)<br \/><br \/>Factorials are widely used in mathematics, statistics and programs, this one&#8217;s a popular topic for interviews.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-09be002 e-flex e-con-boxed e-con e-parent\" data-id=\"09be002\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f88a151 elementor-widget elementor-widget-heading\" data-id=\"f88a151\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Why_Use_a_While_Loop\"><\/span>Why Use a While Loop?<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-da91c25 elementor-widget elementor-widget-text-editor\" data-id=\"da91c25\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The while loop is a flexible way to perform an iterative job in Java. A while loop runs while its condition is true, which makes it favorable for jobs like calculating factorials where the number of iterations is dynamically determined.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ebc73b4 elementor-hidden-mobile e-flex e-con-boxed e-con e-parent\" data-id=\"ebc73b4\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-d795dcb e-con-full e-flex e-con e-child\" data-id=\"d795dcb\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-9687695 e-con-full e-flex e-con e-child\" data-id=\"9687695\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2b427cd elementor-widget elementor-widget-heading\" data-id=\"2b427cd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/unp.education\/course-overview\/mastering-buisness-intelligence-with-power-bi\">Unlock Your Business Intelligence Potential with Power BI!<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-792c678 elementor-widget elementor-widget-heading\" data-id=\"792c678\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\">Take the next step in your data career with our 6-week comprehensive course, 'Mastering Business Intelligence with Power BI'.\nReady to transform your data skills? 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Enroll Now and elevate your career with UNP Education!<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-85f836a e-con-full e-flex e-con e-child\" data-id=\"85f836a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-10d220b elementor-widget elementor-widget-button\" data-id=\"10d220b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/unp.education\/course-overview\/mastering-buisness-intelligence-with-power-bi\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Join Now<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-199f8b1 elementor-widget elementor-widget-button\" data-id=\"199f8b1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/unp.education\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Browse Course<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8ec72a6 e-flex e-con-boxed e-con e-parent\" data-id=\"8ec72a6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-320809b elementor-widget elementor-widget-heading\" data-id=\"320809b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Factorial_Program_in_Java_Using_While_Loop\"><\/span>Factorial Program in Java Using While Loop<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-442b73f elementor-widget elementor-widget-text-editor\" data-id=\"442b73f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4><span class=\"ez-toc-section\" id=\"Code_Explanation\"><\/span><strong>Code Explanation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4><p>Here\u2019s a step-by-step breakdown of the <strong>factorial program in Java<\/strong> using a while loop:<\/p><ol><li><strong>Input a Number:<\/strong> The program prompts the user to enter a non-negative integer.<\/li><li><strong>Initialize Variables:<\/strong> Set up a variable to hold the result (<code>factorial<\/code>) and another for iteration (<code>i<\/code>).<\/li><li><strong>Use a While Loop:<\/strong> Multiply <code>factorial<\/code> by <code>i<\/code> repeatedly until the loop condition is false.<\/li><li><strong>Display the Result:<\/strong> Output the calculated factorial to the console.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aa32e46 elementor-widget elementor-widget-text-editor\" data-id=\"aa32e46\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4><span class=\"ez-toc-section\" id=\"Code_implementation\"><\/span><strong>Code implementation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4><p><span style=\"color: #333399;\">import java.util.Scanner;<\/span><\/p><p><span style=\"color: #333399;\">public class FactorialWhileLoop {<\/span><br \/><span style=\"color: #333399;\">public static void main(String[] args) {<\/span><br \/><span style=\"color: #333399;\">Scanner scanner = new Scanner(System.in);<\/span><\/p><p><span style=\"color: #333399;\">\/\/ Input from user<\/span><br \/><span style=\"color: #333399;\">System.out.print(&#8220;Enter a non-negative integer: &#8220;);<\/span><br \/><span style=\"color: #333399;\">int number = scanner.nextInt();<\/span><\/p><p><span style=\"color: #333399;\">\/\/ Initialize variables<\/span><br \/><span style=\"color: #333399;\">int i = 1;<\/span><br \/><span style=\"color: #333399;\">long factorial = 1; \/\/ Use long to handle large results<\/span><\/p><p><span style=\"color: #333399;\">\/\/ Validate input<\/span><br \/><span style=\"color: #333399;\">if (number &lt; 0) {<\/span><br \/><span style=\"color: #333399;\">System.out.println(&#8220;Factorial is not defined for negative numbers.&#8221;);<\/span><br \/><span style=\"color: #333399;\">} else {<\/span><br \/><span style=\"color: #333399;\">\/\/ Calculate factorial using while loop<\/span><br \/><span style=\"color: #333399;\">while (i &lt;= number) {<\/span><br \/><span style=\"color: #333399;\">factorial *= i;<\/span><br \/><span style=\"color: #333399;\">i++;<\/span><br \/><span style=\"color: #333399;\">}<\/span><\/p><p><span style=\"color: #333399;\">\/\/ Output the result<\/span><br \/><span style=\"color: #333399;\">System.out.println(&#8220;Factorial of &#8221; + number + &#8221; is: &#8221; + factorial);<\/span><br \/><span style=\"color: #333399;\">}<\/span><\/p><p><span style=\"color: #333399;\">scanner.close();<\/span><br \/><span style=\"color: #333399;\">}<\/span><br \/><span style=\"color: #333399;\">}<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e4fb699 elementor-widget elementor-widget-text-editor\" data-id=\"e4fb699\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4><span class=\"ez-toc-section\" id=\"Analyzing_the_Output\"><\/span>Analyzing the Output<span class=\"ez-toc-section-end\"><\/span><\/h4><p>When you run the above program, you&#8217;ll see results like:<\/p><ul><li>Input: <code>5<\/code><\/li><li>Output: <code>Factorial of 5 is: 120<\/code><\/li><\/ul><p>This program handles both valid and invalid inputs gracefully.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d8e99fa e-flex e-con-boxed e-con e-parent\" data-id=\"d8e99fa\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8a0a6b7 elementor-widget elementor-widget-heading\" data-id=\"8a0a6b7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Common_Errors_to_Avoid\"><\/span>Common Errors to Avoid<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-855c2fa elementor-widget elementor-widget-text-editor\" data-id=\"855c2fa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Forgetting to initialize <code>factorial<\/code> to <code>1<\/code>.<\/li><li>Using an incorrect loop condition (<code>i &lt; number<\/code> instead of <code>i &lt;= number<\/code>).<\/li><li>Not accounting for negative input values.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b7c2eb5 e-flex e-con-boxed e-con e-parent\" data-id=\"b7c2eb5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2141c2a elementor-widget elementor-widget-heading\" data-id=\"2141c2a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Factorial_Using_Recursion_in_Java\"><\/span>Factorial Using Recursion in Java<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c6a086a elementor-widget elementor-widget-text-editor\" data-id=\"c6a086a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Recursion is another popular way to calculate the <strong>factorial of a number in Java<\/strong>. Here\u2019s a quick comparison:<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2d32e61 elementor-widget elementor-widget-text-editor\" data-id=\"2d32e61\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><h4><span class=\"ez-toc-section\" id=\"Recursive_Implementation\"><\/span><strong>Recursive Implementation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cfb2d83 elementor-widget elementor-widget-text-editor\" data-id=\"cfb2d83\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><p><span style=\"color: #333399;\">public class FactorialRecursion {<\/span><br \/><span style=\"color: #333399;\">public static long factorial(int n) {<\/span><br \/><span style=\"color: #333399;\">if (n == 0 || n == 1) {<\/span><br \/><span style=\"color: #333399;\">return 1;<\/span><br \/><span style=\"color: #333399;\">}<\/span><br \/><span style=\"color: #333399;\">return n * factorial(n &#8211; 1);<\/span><br \/><span style=\"color: #333399;\">}<\/span><\/p><p><span style=\"color: #333399;\">public static void main(String[] args) {<\/span><br \/><span style=\"color: #333399;\">int number = 5;<\/span><br \/><span style=\"color: #333399;\">System.out.println(&#8220;Factorial of &#8221; + number + &#8221; is: &#8221; + factorial(number));<\/span><br \/><span style=\"color: #333399;\">}<\/span><br \/><span style=\"color: #333399;\">}<\/span><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e848b2a e-flex e-con-boxed e-con e-parent\" data-id=\"e848b2a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bdb4039 elementor-widget elementor-widget-heading\" data-id=\"bdb4039\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f09ffd0 elementor-widget elementor-widget-text-editor\" data-id=\"f09ffd0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Understanding how to write a <strong>factorial program in Java<\/strong> using a while loop is crucial for both beginners and advanced programmers. It builds your logical thinking and problem-solving skills, especially for <strong>interview preparation<\/strong>. Whether you use a loop or recursion, the key is to grasp the underlying logic and practice consistently.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fce5319 e-flex e-con-boxed e-con e-parent\" data-id=\"fce5319\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-dba0321 elementor-widget elementor-widget-heading\" data-id=\"dba0321\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a81b331 elementor-widget elementor-widget-text-editor\" data-id=\"a81b331\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><p><span style=\"color: #000000;\"><strong>What is the simplest way to calculate a factorial in Java?<\/strong><\/span><br \/>Using a while loop is straightforward for beginners to calculate factorials.<\/p><\/li><li><p><span style=\"color: #000000;\"><strong>How does recursion compare with a while loop for factorial calculation?<\/strong><\/span><br \/>Recursion is concise but can lead to stack overflow; loops are more memory-efficient.<\/p><\/li><li><p><span style=\"color: #000000;\"><strong>Can factorial programs handle large numbers in Java?<\/strong><\/span><br \/>Yes, by using <code>BigInteger<\/code>, you can manage very large factorials without overflow.<\/p><\/li><li><p><span style=\"color: #000000;\"><strong>Why are factorial programs commonly used in interviews?<\/strong><\/span><br \/>They test your understanding of loops, recursion, and edge cases in programming.<\/p><\/li><li><p><span style=\"color: #000000;\"><strong>How can I prepare for interview questions on factorial programs?<\/strong><\/span><br \/>Practice implementing factorials using loops and recursion. Understand edge cases and optimize for performance.<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-19aa800c elementor-hidden-mobile e-flex e-con-boxed e-con e-parent\" data-id=\"19aa800c\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3de42d37 e-con-full e-flex e-con e-child\" data-id=\"3de42d37\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-66bbb28c e-con-full e-flex e-con e-child\" data-id=\"66bbb28c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-11f97e45 elementor-widget elementor-widget-heading\" data-id=\"11f97e45\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Unlock Your Business Intelligence Potential with Power BI!<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-58b085d3 elementor-widget elementor-widget-heading\" data-id=\"58b085d3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-default\">Take the next step in your data career with our 6-week comprehensive course, 'Mastering Business Intelligence with Power BI'.\nReady to transform your data skills? 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data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5de704a0 elementor-widget elementor-widget-video\" data-id=\"5de704a0\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/Cv92eezCg9w?si=6ca76uOqbVoPdgEI&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-174465ad e-con-full e-flex e-con e-child\" data-id=\"174465ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-5a592751 e-con-full e-flex e-con e-child\" data-id=\"5a592751\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3d2d3ed6 elementor-widget elementor-widget-video\" data-id=\"3d2d3ed6\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/iALhOYlbkCQ?si=N8pEWOfhvEVPyEub&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-23423451 e-con-full e-flex e-con e-child\" data-id=\"23423451\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6b10e533 elementor-widget elementor-widget-video\" data-id=\"6b10e533\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/BGv6TJxGizc?si=N6C5kh1xYnG8b8Zr&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Calculating the factorial of a number is a fundamental concept in programming and plays a significant role in interview preparation. If you&#8217;re diving into Java, understanding how to implement a factorial program in Java using a while loop is essential. This article will walk you through the process step by step, ensuring clarity and mastery. &#8230; <a title=\"Factorial Program Using While Loop in Java\" class=\"read-more\" href=\"https:\/\/unp.education\/content\/factorial-program-using-while-loop-in-java-article\/\" aria-label=\"Read more about Factorial Program Using While Loop in Java\">Read more<\/a><\/p>\n","protected":false},"author":7951,"featured_media":18126,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-18123","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interview-preparation"],"_links":{"self":[{"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/posts\/18123","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/users\/7951"}],"replies":[{"embeddable":true,"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/comments?post=18123"}],"version-history":[{"count":19,"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/posts\/18123\/revisions"}],"predecessor-version":[{"id":18145,"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/posts\/18123\/revisions\/18145"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/media\/18126"}],"wp:attachment":[{"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/media?parent=18123"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/categories?post=18123"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unp.education\/content\/wp-json\/wp\/v2\/tags?post=18123"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}