List of Armstrong Number in Java

A very simple program to list down the Armstrong numbers in Java.

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Sample Program Output

Program Listing

public class Main {

    public static void main(String[] args) {
        int a =0;
        int num =0;

        int n, sum, temp, remainder, digits;

        int start = 100;
        int end =2000;

        System.out.println("\n\n");
        System.out.print("List of Armstrong Number in Java");
        System.out.println("\n");

        for (int i = start; i <= end; i++) {

            sum = 0;
            digits = 0;

            temp = i;

            while (temp != 0) {
                digits++;
                temp = temp / 10;
            }

            temp = i;

            while (temp != 0) {
                remainder = temp % 10;
                sum = sum + power(remainder, digits);
                temp = temp / 10;
            }

            if (i == sum)
                System.out.println(i + " is an Armstrong number.");

        }
        System.out.println();
        System.out.print("End of Program");
        System.out.println();
    }

    static int power(int n, int r) {
        int c, p = 1;

        for (c = 1; c <= r; c++)
            p = p * n;

        return p;
    }

    }