{"id":794,"date":"2021-10-23T08:56:50","date_gmt":"2021-10-23T07:56:50","guid":{"rendered":"https:\/\/codeflarelimited.com\/blog\/?p=794"},"modified":"2021-10-23T08:56:52","modified_gmt":"2021-10-23T07:56:52","slug":"check-if-a-number-is-palindrome-in-java","status":"publish","type":"post","link":"https:\/\/codeflarelimited.com\/blog\/check-if-a-number-is-palindrome-in-java\/","title":{"rendered":"Check If a Number is Palindrome in Java"},"content":{"rendered":"\n

It is true that Strings can be palindromic in nature. The same can equally be said of numbers.<\/p>\n\n\n\n

A palindromic number (sometimes called numeral or numeric palindrome) is one such that if its digits are reversed, it stays the same.<\/p>\n\n\n\n

This number is said to have a reflectional symmetry across the vertical axis. Example of such numbers are 16461, 151, 242, etc.<\/p>\n\n\n\n

Let us now see how we can check for this palindromic quality using Java programming language.<\/p>\n\n\n\n

class CheckPalindrome{\n\npublic static void main(Strings args[]){\n  System.out.println(isPalindromeInt(121));\n}\n\npublic static String isPalindromeInt(int n) {\r\n\t\t \n   int reversedNum = 0;\r\n   int remainder;\r\n   int originalNum = n;\r\n    \r\n         while (n != 0) {\r\n      remainder = num % 10;\r\n      reversedNum = reversedNum * 10 + remainder;\r\n      n \/= 10;\r\n    }\r\n    \r\n    \/\/ check if reversedNum and originalNum are equal\r\n    if (originalNum == reversedNum) {\r\n\treturn originalNum + \"is Palindrome.\";\r\n    }\r\n    else {\r\n    return originalNum + \"is not Palindrome.\";\r\n    }\r\n  }\r\n\n}<\/code><\/pre>\n\n\n\n
So what we did here was to create a static method that will return our given result<\/a> based on the parameters passed.<\/p>\n\n\n\n
By using the modulus operator<\/a>, we effectively get the remainder when we divide by 10 and then attempt to do a reversal.<\/p>\n\n\n\n
If the reversed number is still equal to the reversed number, then it is a palindrome, otherwise it is not.<\/p>\n\n\n\n
This is effectively how Palindrome works.<\/p>\n\n\n\n
Let us know what you think in the comments.<\/p>\n\n\n\n