Java Check Kaprekar Number

import java.util.*;
class CheckkaprekarNumber{
    public static void main(String args[])throws Exception{
        Scanner input=new Scanner(System.in);
        System.out.print("Enter number: ");
        int x=input.nextInt();
        int num=x*x,no=x,digit=0;
        int rev=0;
        while(no>0){
            digit++;
            no=no/10;
            }
            no=num;
            while(digit > 0){
                rev=rev*10+no%10;
                no=no/10;
                digit--;
                }
                int r=0;
                while(rev > 0){
                    r=r*10+rev%10;
                    rev=rev/10;
                    }
                    if((r+no)==x){
                        System.out.println("It is a Kaprekar No. ");
                        }
                        else{
                            System.out.println("It is not a Kaprekar No. ");
                            }
                            }
                            }