Write a program in java to input a number and check the number is an armstrong or not.

What is Armstrong Number ?

In an Armstrong Number, the sum of power of individual digits is equal to number itself.

In other words the following equation will hold true

xy..z = xn + yn+.....+ zn

n is number of digits in number

For example this is a 3 digit Armstrong number

370 = 33 + 73 + 03
    = 27 + 343 + 0
    = 370

Examples of Armstrong Numbers

0, 1, 4, 5, 9, 153, 371, 407, 8208, etc.

Program:
import java.util.*;
class Armstrong
{
  public static void main(String args[])
  {
    int n,s=0,r,t;
    Scanner sc=new Scanner(System.in);
    System.out.println("Enter the number to check its an armstrong or not:");
    n=sc.nextInt();
    t=n;
    while(n!=0)
    {
      r=n%10;
      s=s+(r*r*r);
      n=n/10;
    }
    if(t==s)
    {
      System.out.println("Entered number is an armstrong");
    }
    else
        System.out.println("Entered number is not an armstrong");
  }
}

Output:
Enter the number to check its an armstrong or not:
123
Entered number is not an armstrong

Enter the number to check its an armstrong or not:
153
Entered number is an armstrong