44 lines
1.3 KiB
Java
44 lines
1.3 KiB
Java
package Others;
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/**
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* An Armstrong number is equal to the sum of the cubes of its digits.
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* For example, 370 is an Armstrong number because 3*3*3 + 7*7*7 + 0*0*0 = 370.
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* An Armstrong number is often called Narcissistic number.
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*/
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public class Armstrong {
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public static void main(String[] args) {
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assert (isArmStrong(0));
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assert (isArmStrong(1));
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assert (isArmStrong(153));
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assert (isArmStrong(1634));
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assert (isArmStrong(371));
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assert (!isArmStrong(200));
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}
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/**
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* Checks whether a given number is an armstrong number or not.
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*
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* @param number number to check
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* @return {@code true} if given number is armstrong number, {@code false} otherwise
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*/
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private static boolean isArmStrong(int number) {
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int sum = 0;
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int temp = number;
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int numberOfDigits = 0;
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while (temp != 0) {
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numberOfDigits++;
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temp /= 10;
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}
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temp = number; /* copy number again */
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while (number > 0) {
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int remainder = number % 10;
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int power = 1;
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for (int i = 1; i <= numberOfDigits; power *= remainder, ++i) ;
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sum = sum + power;
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number /= 10;
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}
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return sum == temp;
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}
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}
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