What is the logic for determining if a number is an Armstrong number, and how would you implement that logic in code?

Question

Accepted Answer

Armstrong number is a number whose sum of cubes of its digits is equal to the number itself.

Armstrong number is also known as Narcissistic number.
For example, 153 is an Armstrong number because 1^3 + 5^3 + 3^3 = 153.
The coding logic involves breaking down the number into its individual digits, cubing them, and then adding them up.
Finally, the sum is compared with the original number to determine if it is an Armstrong number or not.

Accepted Answer

public class Armstrong {

    public static void main(String[] args) {

        int number = 371, originalNumber, remainder, result = 0;

        originalNumber = number;

        while (originalNumber != 0)
        {
            remainder = originalNumber % 10;
            result += Math.pow(remainder, 3);
            originalNumber /= 10;
        }

        if(result == number)
            System.out.println(number + " is an Armstrong number.");
        else
            System.out.println(number + " is not an Armstrong number.");
    }
}

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What is the logic for determining if a number is an Armstrong number, and how would you implement that logic in code?

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