java - is armstrong number

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

import java.util.Arrays; import java.util.stream.IntStream; public class _Math { static int[] armstrong_number_generator(int min, int max){ return IntStream.rangeClosed(min, max).filter(_Math::is_armstrong_number).toArray(); } /** * * @param num * @return */ static boolean is_armstrong_number(int num ){ if(num < 10 && num >= 0) return true; int[] nums = digits_in_number(num); return num == IntStream.of(nums).mapToDouble(i -> Math.pow(i, nums.length)).sum(); } }

styled using hilite.me