PalindromeNumber.java

/*

Source: https://leetcode.com/problems/palindrome-number/

*/

class Solution {
  public boolean isPalindrome(int x) {

    if (x < 0 || (x != 0 && (x % 10) == 0)) {
      return false;
    }

    if (x < 10) {
      return true;
    }

    int rev = 0;
    while(x > rev) {
      rev = (rev * 10) + (x % 10);
      x /= 10;
    }

    return (x == rev) || (x == rev / 10);
  }
}