armstrong.java

import java.util.*;
class armstrong{
    public static void main(String args[]){
        /*
         * An Armstrong number is a number that is equal to the sum of its own digits 
         * each raised to the power of the number of digits.
           For example:
        -> 153=1^3+5^3+3^3 → so 153 is an Armstrong number.
        -> 9474=9^4+4^4+7^4+4^4 → so 9474 is also an Armstrong number.

         */
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter your number");
        int n=sc.nextInt();
        int n1=n;
        int num = n;
        int r=0;
        int s=0;
        int d =0 ;
        while(n>0){
            d++;
            n=n/10;
            
        } while(n1>0){
            r=n1%10;
            s += (int)Math.pow(r, d);
            n1 = n1/10;
        } 
        if(num == s)
        {
            System.out.println(num +" is an Armstrong Number");
        }
        else
        {
            System.out.println(num +" is not an Armstrong Number");
        }
        sc.close();
    }
}