Java/Maths/Armstrong.java at master · iDev-git/Java · GitHub

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package Maths;

/**

* An Armstrong number is equal to the sum of the cubes of its digits. For example, 370 is an

* Armstrong number because 3*3*3 + 7*7*7 + 0*0*0 = 370. An Armstrong number is often called

* Narcissistic number.

public class Armstrong {

public static void main(String[] args) {

assert (isArmStrong(0));

assert (isArmStrong(1));

assert (isArmStrong(153));

assert (isArmStrong(1634));

assert (isArmStrong(371));

assert (!isArmStrong(200));

}

/**

* Checks whether a given number is an armstrong number or not.

* @param number number to check

* @return {@code true} if given number is armstrong number, {@code false} otherwise

private static boolean isArmStrong(int number) {

int sum = 0;

int temp = number;

int numberOfDigits = 0;

while (temp != 0) {

numberOfDigits++;

temp /= 10;

}

temp = number; /* copy number again */

while (number > 0) {

int remainder = number % 10;

int power = 1;

for (int i = 1; i <= numberOfDigits; power *= remainder, ++i)

;

sum = sum + power;

number /= 10;

}

return sum == temp;

}

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