Armstrong number program in java

import java.io.*;
class Amstrong
 {
  public static void main(String args[]) throws IOException
  {
  int num,temp,n,sum=0;
  System.out.println("enter your number:\n");
  DataInputStream din=new DataInputStream(System.in);
  num=Integer.parseInt(din.readLine());
  temp=num;

 while(temp>0)
   {
     n++;
     temp/=10;
   }

 temp=num;
   while(temp>0)
   {
     sum+=pow(temp%10,n);
     temp/=10;
   }


   if(sum==num)
    {
     System.out.println(num+" is an amstrong number");
    }
   else
     {
      System.out.println(num+" is not an amstrong number");
     }
 }
int pow(int a,int b)
{
  int product=1;
  for(int i=0;i<b;i++)
   {
     product*=a;
   }
  return product;
}
}

Output of above Program is:

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