Design a class ArmNum to check if a given number is an Armstrong number or not. [A number is said…

Design a class ArmNum to check if a given number is an Armstrong number or not. [A number is said to be Armstrong if sum of its digits raised to the power of length of the number is equal to the number] Example : 371 = $3^3 + 7^3 + 1^3$ 1634 = $1^4 + 6^4 + 3^4 + 4^4$ 54748 = $5^5 + 4^5 + 7^5 + 4^5 + 8^5$ Thus 371, 1634 and 54748 are all examples of Armstrong numbers. Some of the members of the class are given below: Class name : ArmNum Data members/instance variables: n : to store the number l : to store the length of the number Methods/Member functions: ArmNum (int nn) : parameterized constructor to initialize the data member n=nn int sum_pow(int i) : returns the sum of each digit raised to the power of the length of the number using recursive technique eg. 34 will return $3^2 + 4^2$ (as the length of the number is 2) void isArmstrong( ) : checks whether the given number is an Armstrong number by invoking the function sum_pow( ) and displays the result with an appropriate message Specify the class ArmNum giving details of the constructor( ), int sum_pow(int) and void isArmstrong( ). Define a main( ) function to create an object and call the functions accordingly to enable the task.

import java.util.Scanner;

class ArmNum
{
    int n;
    int l;

    ArmNum(int nn)
    {
        n = nn;
        l = String.valueOf(n).length();
    }

    int sum_pow(int i)
    {
        if (i == 0)
            return 0;
        else
        {
            int digit = i % 10;
            return (int) Math.pow(digit, l) + sum_pow(i / 10);
        }
    }

    void isArmstrong()
    {
        int s = sum_pow(n);
        if (s == n)
            System.out.println(n + " is an Armstrong number.");
        else
            System.out.println(n + " is not an Armstrong number.");
    }

    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int nn = sc.nextInt();
        ArmNum obj = new ArmNum(nn);
        obj.isArmstrong();
    }
}