Check Palindrome Number Program in Java

What is Palindrome Number?

A Palindrome Number is a number that even when reversed is same as original number

Examples of Palindrome Number

121, 393, 34043, 111, 555, 48084 

Examples of Palindrome Number

 LOL, MADAM

Program Logic

• Fetch the input number that needs to be checked for being a Palindrome
• Copy number into a temporary variable and reverse it.
• Compare the reversed and original number.
• If they are same, number is "palindrome number"
• Else number is not "palindrome number"

Program to check whether input number is palindrome or not

package com.guru99;
 
public class PalindromeNum {
 
 public static void main(String[] args)
 {
 
  int lastDigit,sum=0,a;    
  int inputNumber=171; //It is the number  to be checked for palindrome 
 
  a=inputNumber; 
        
        // Code to reverse a number
  while(a>0)
  {   System.out.println("Input Number "+a);  
   lastDigit=a%10; //getting remainder  
   System.out.println("Last Digit "+lastDigit); 
   System.out.println("Digit "+lastDigit+ " was added to sum "+(sum*10)); 
   sum=(sum*10)+lastDigit;  
   a=a/10;
   
  }    
 
  // if given number equal to sum than number is palindrome otherwise not palindrome
  if(sum==inputNumber)    
   System.out.println("Number is palindrome ");    
  else    
   System.out.println("Number is not palindrome");    
 
 }
 
}

Output:

Input Number 171
Last Digit 1
Digit 1 was added to sum 0
Input Number 17
Last Digit 7
Digit 7 was added to sum 10
Input Number 1
Last Digit 1
Digit 1 was added to sum 170
Number is palindrome