Check if a given number is a disarium number or not in java

A disarium number is a number in which the sum of the digits to the power of their respective position is equal to the number itself .

import java.util.*;
import java.lang.*;
class disariumTest
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter Number: ");
        int num = sc.nextInt();        
        String s = Integer.toString(num);
        int l = s.length();        
        int n = num;       
        double c = 0;        
        int last_digit;
        
        while(num > 0)
        {
            last_digit = num % 10;
            
            c = c + Math.pow(last_digit,l);
            
            num = num / 10;
            
            l--;
        }
        if(n == c)
        {
            System.out.println("Disarium Number.");
        }
        else
        {
            System.out.println("Not a Disarium Number.");
        }
        sc.close();
    }
}