Java program to input a number and check whether it is a Kaprekar number or not

Write a program to input a number and check whether it is a Kaprekar number or not. Take a positive whole number n that has d number of digits. Take the square n and separate the result into two pieces: a right-hand piece that has d digits and a left-hand piece that has either d or d-1 digits. Add these two pieces together. If the result is n, then n is a Kaprekar number.

Examples are 9 (92 = 81, 8 + 1 = 9), 45 (452 = 2025, 20 + 25 = 45), and 297 (2972 = 88209, 88 + 209 = 297).

import java.util.*;
class Kaprekar
{
	public static void main(String arr[])
	{
		Scanner sc=new Scanner(System.in);
		int i,d=0,a,s=0,f,l;
		System.out.println("Enter an integer:");
		a=sc.nextInt();
		for(i=a;i>0;i=i/10)
		{
			d++;
		}
		s=a*a;
		f=s/(int)Math.pow(10,d);
		l=s%(int)Math.pow(10,d);
		if(f+l==a)
		System.out.println("Kaprekar Number");
		else
		System.out.println("Not a Kaprekar Number");
	}
}