Armstrong Number

package org.interview.test;

import java.util.Scanner;

public class ArmstrongNumber {

/*
* An Armstrong number of three digits is an integer such that the sum of the cubes of its 
*  digits is equal to the number itself. 
* For example, 371 is an Armstrong number since 3**3 + 7**3 + 1**3 = 371.
*/
public static void main (String [] args ) throws Exception {
int n, sum = 0, temp, r;
 
     Scanner in = new Scanner(System.in);
     System.out.println("Enter a number to check if it is an armstrong number");      
     n = in.nextInt();
 
     temp = n;
     System.out.println("temp:"+temp);
     int c =1;
     while( temp != 0 ) {
     System.out.println(c+".temp:"+temp);
        r = temp%10;
        System.out.println(c+".r:"+r);
        sum = sum + r*r*r;
        System.out.println(c+".sum:"+sum);
        temp = temp/10; 
        System.out.println(c+".temp:"+temp);
        c++;
     }
 
     if ( n == sum )
        System.out.println("Entered number is an armstrong number.");
     else
        System.out.println("Entered number is not an armstrong number.");
}

}