{"id":6947,"date":"2025-06-18T16:02:39","date_gmt":"2025-06-18T10:32:39","guid":{"rendered":"https:\/\/namastedev.com\/blog\/?p=6947"},"modified":"2025-10-22T19:51:27","modified_gmt":"2025-10-22T14:21:27","slug":"palindrome","status":"publish","type":"post","link":"https:\/\/namastedev.com\/blog\/palindrome\/","title":{"rendered":"Palindrome"},"content":{"rendered":"\n<!-- PrismJS for Syntax Highlighting -->\n<link\n    href=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/themes\/prism-tomorrow.min.css\"\n    rel=\"stylesheet\"\n\/>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/prism.min.js\"><\/script>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/plugins\/autoloader\/prism-autoloader.min.js\"><\/script>\n\n<style>\n.wp_blog_theme {\n  --primary: #E58C32;\n  --secondary: #030302;\n  --light-bg: #fef9f4;\n  --text-dark: #2d2d2d;\n  --tab-radius: 12px;\n  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);\n  --code-bg: #001f3f;\n  --code-text: #d4f1ff;\n}\n\n.wp_blog_container {\n  font-family: 'Segoe UI', sans-serif;\n  background: var(--light-bg);\n  margin: 0;\n  padding: 0;\n  color: var(--text-dark);\n}\n\n\/* Heading *\/\n.wp_blog_main-heading {\n  text-align: center;\n  font-size: 2.4rem;\n  color: var(--primary);\n  margin-top: 2.5rem;\n  font-weight: bold;\n}\n\n\/* Explanation Card *\/\n.wp_blog_explanation,\n.wp_blog_code-tabs-container {\n  max-width: 940px;\n  margin: 2rem auto;\n  padding: 2rem;\n  background: white;\n  border-radius: var(--tab-radius);\n  box-shadow: var(--shadow);\n}\n\n\/* Text and Visuals *\/\n.wp_blog_explanation h2 {\n  font-size: 1.4rem;\n  color: var(--primary);\n  margin-bottom: 0.5rem;\n}\n\n.wp_blog_explanation p,\n.wp_blog_explanation li {\n  font-size: 1.05rem;\n  line-height: 1.7;\n  margin: 0.5rem 0;\n}\n\n.wp_blog_explanation code {\n  background: #fef9f4; 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\/* makes it the reference for absolute children *\/\n}\n\n.wp_blog_toggle-btn {\n  position: absolute;\n  top: 1rem;\n  right: 1rem;\n  z-index: 9999;\n  padding: 0.5rem 0.8rem;\n  border-radius: 10%;\n  background: var(--primary);\n  color: white;\n  font-weight: bold;\n  cursor: pointer;\n  border: none;\n  box-shadow: var(--shadow);\n  transition: background 0.3s, transform 0.2s;\n}\n\n.wp_blog_toggle-btn:hover {\n  background: #cc772e;\n}\n\n.wp_blog_theme.dark-mode .wp_blog_code-tabs-container {\n  background: #1e1e1e;\n}\n<\/style>\n\n\n\n<div class=\"wp_blog_container wp_blog_theme\">\n            <button id=\"blogNotesThemeToggle\" class=\"wp_blog_toggle-btn\">\ud83c\udf19<\/button>\n<h1 class=\"wp_blog_main-heading\"><\/h1>\n\n<div class=\"wp_blog_explanation\">\n    <h2>Problem Statement:<\/h2>\n    <p>\n        Write a function <code>isPalindrome(x)<\/code> that takes an integer\n        <code>x<\/code> and returns <code>true<\/code> if it reads the same\n        backward and forward; otherwise <code>false<\/code>.\n    <\/p>\n\n    <h2>Requirements:<\/h2>\n    <ul>\n        <li>Handles both positive and negative integers.<\/li>\n        <li>\n            Return <code>false<\/code>for negative numbers (not Palindromes).\n        <\/li>\n    <\/ul>\n\n    <h2>Constraints:<\/h2>\n    <p>\n        <code>Time Complexity: O(d)<\/code>Where <code>d<\/code>is the number of\n        digits.\n    <\/p>\n    <p>\n        <code>Space Complexity: <code>O(1)<\/code><\/code\n        >Only a few variables are used.\n    <\/p>\n\n    <h2>Examples:<\/h2>\n    <p><strong>Input:<\/strong>121<\/p>\n    <p><strong>Output:<\/strong><code>true<\/code><\/p>\n    <p><strong>Input:<\/strong>-121<\/p>\n    <p><strong>Output:<\/strong><code>false<\/code><\/p>\n    <p><strong>Input:<\/strong>10<\/p>\n    <p><strong>Output:<\/strong><code>false<\/code><\/p>\n\n    <h2>Approach:<\/h2>\n    <ul>\n        <li>\n            <strong>Handle Negatives:<\/strong>If <code>x < 0<\/code>, return\n            false.\n        <\/li>\n\n        <li>\n            <strong>Store Original<\/strong>Save the input\n            in<code>xCopy<\/code>for comparison.\n        <\/li>\n\n        <li>\n            <strong>Reverse:<\/strong>Intialize<code>rev = 0<\/code> while\n            <code>x > 0 : rem = x % 10 rev = rev * 10 + rem x \/\/= 10 <\/code>\n        <\/li>\n        <li>\n            <strong>Compare:<\/strong>If <code>rev === xCopy<\/code>return\n            <code>true;<\/code> else <code>false<\/code>.\n        <\/li>\n    <\/ul>\n\n    <h2>Flow Chart:<\/h2>\n    <img decoding=\"async\"\n        src=\"https:\/\/namastedev.com\/blog\/wp-content\/uploads\/2025\/06\/Screenshot-2025-06-21-at-12.15.15\u202fPM.png\"\n        alt=\"Visual representation of sum\"\n    \/>\n<\/div>\n\n<div class=\"wp_blog_code-tabs-container\">\n    <div class=\"wp_blog_code-tabs-header\">\n        <button class=\"wp_blog_code-tab-button active\" data-lang=\"js\">\n            JavaScript\n        <\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"py\">Python<\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"java\">Java<\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"cpp\">C++<\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"c\">C<\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"cs\">C#<\/button>\n    <\/div>\n\n    <div class=\"wp_blog_code-tab-content active\" data-lang=\"js\">\n        <pre><code class=\"language-javascript\">\nvar isPalindrome = function(x) {\n  if (x < 0) return false;\n  let xCopy = x;\n  let rev = 0;\n  while (x > 0) {\n    let rem = x % 10;\n    rev = rev * 10 + rem;\n    x = Math.floor(x \/ 10);\n  }\n  return rev === xCopy;\n};\n\nconsole.log(isPalindrome(121)); \/\/ true\n    <\/code><\/pre>\n    <\/div>\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"py\">\n        <pre><code class=\"language-python\">\nclass Solution:\n    def isPalindrome(self, x):\n        if x < 0:\n            return False\n        x_copy = x\n        rev = 0\n        while x > 0:\n            rem = x % 10\n            rev = rev * 10 + rem\n            x \/\/= 10\n        return rev == x_copy\n\nsol = Solution()\nprint(sol.isPalindrome(121))  # True\n    <\/code><\/pre>\n    <\/div>\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"java\">\n        <pre><code class=\"language-java\">\npublic class Solution {\n  public boolean isPalindrome(int x) {\n     if (x < 0) return false;\n        int xCopy = x;\n        int rev = 0;\n    while (x > 0) {\n        int rem = x % 10;\n        rev = rev * 10 + rem;\n        x \/= 10;\n    }\n        return rev == xCopy;\n}\n\n  public static void main(String[] args) {\n    Solution sol = new Solution();\n    System.out.println(sol.isPalindrome(121)); \/\/ true\n  }\n} <\/code><\/pre>\n    <\/div>\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"cpp\">\n        <pre><code class=\"language-cpp\">\n#include &lt;iostream&gt;\nusing namespace std;\n\nclass Solution {\npublic:\n  bool isPalindrome(int x) {\n    if (x < 0) return false;\n    int xCopy = x;\n    long long rev = 0;\n    while (x > 0) {\n      int rem = x % 10;\n      rev = rev * 10 + rem;\n      x \/= 10;\n    }\n    return rev == xCopy;\n  }\n};\n\nint main() {\n  Solution sol;\n  cout &lt;&lt; boolalpha &lt;&lt;  sol.isPalindrome(121) &lt;&lt; endl; \/\/ true\n  return 0;\n}\n    <\/code><\/pre>\n    <\/div>\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"c\">\n        <pre><code class=\"language-c\">\n#include &lt;stdio.h&gt;\n#include &lt;limits.h&gt;\nbool isPalindrome(int x) {\n  if (x < 0) return false;\n  int xCopy = x;\n  long long rev = 0;\n  while (x > 0) {\n    int rem = x % 10;\n    rev = rev * 10 + rem;\n    x \/= 10;\n  }\n  return rev == xCopy;\n}\n\nint main() {\n  int num = 121;\n  printf(\"%s\\n\", isPalindrome(num) ? \"true\" : \"false\");\n  return 0;\n}\n    <\/code><\/pre>\n    <\/div>\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"cs\">\n        <pre><code class=\"language-csharp\">\nusing System;\nclass Program\n{\n static void Main()\n    {\n     Console.Write(\"Enter a number: \");\n     int number = int.Parse(Console.ReadLine());\n       if (IsPalindrome(number))\n         Console.WriteLine(\"The number is a palindrome.\");\n       else\n         Console.WriteLine(\"The number is not a palindrome.\");\n       }\n    static bool IsPalindrome(int number)\n    {\n     int original = number;\n     int reversed = 0;\n     while (number > 0)\n      {\n        int digit = number % 10;\n        reversed = reversed * 10 + digit;\n        number \/= 10;\n      }\n      return original == reversed;\n    }\n}\n  <\/code><\/pre>\n    <\/div>\n<\/div>\n<\/div>\n\n<script>\ndocument.addEventListener(\"DOMContentLoaded\", () => {\n  const buttons = document.querySelectorAll(\".wp_blog_code-tab-button\");\n  const contents = document.querySelectorAll(\".wp_blog_code-tab-content\");\n\n  buttons.forEach((button) => {\n    button.addEventListener(\"click\", () => {\n      const lang = button.getAttribute(\"data-lang\");\n\n      buttons.forEach((btn) => btn.classList.remove(\"active\"));\n      contents.forEach((content) => content.classList.remove(\"active\"));\n\n      button.classList.add(\"active\");\n      document\n        .querySelector(`.wp_blog_code-tab-content[data-lang=\"${lang}\"]`)\n        .classList.add(\"active\");\n    });\n  });\n\n  const themeToggle = document.getElementById(\"blogNotesThemeToggle\");\n  const themeContainer = document.querySelector(\".wp_blog_theme\");\n\n  themeToggle.addEventListener(\"click\", () => {\n    themeContainer.classList.toggle(\"dark-mode\");\n    themeToggle.textContent =\n      themeContainer.classList.contains(\"dark-mode\") ? \"\u2600\ufe0f\" : \"\ud83c\udf19\";\n  });\n});\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>\ud83c\udf19 Problem Statement: Write a function isPalindrome(x) that takes an integer x and returns true if it reads the same backward and forward; otherwise false. Requirements: Handles both positive and negative integers. Return falsefor negative numbers (not Palindromes). Constraints: Time Complexity: O(d)Where dis the number of digits. Space Complexity: O(1)Only a few variables are used.<\/p>\n","protected":false},"author":108,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[210,322,260,176,175,211,811,810,174,172,173],"tags":[],"class_list":["post-6947","post","type-post","status-publish","format-standard","category-algorithms","category-algorithms-and-data-structures","category-c-c-plus-plus","category-csharp","category-cplusplus","category-data-structures","category-data-structures-and-algorithms","category-dsa","category-java","category-javascript","category-python"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/6947","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/users\/108"}],"replies":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/comments?post=6947"}],"version-history":[{"count":4,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/6947\/revisions"}],"predecessor-version":[{"id":10537,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/6947\/revisions\/10537"}],"wp:attachment":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/media?parent=6947"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/categories?post=6947"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/tags?post=6947"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}