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GeezerVison is showing github.com — Java/Maths/SumOfDigits.java at master · tmluwei/Java Expand file tree/ Copy pathSumOfDigits.javaMore file actions 56 lines (50 loc) · 1.61 KB / Copy pathSumOfDigits.javaFile metadata and controls56 lines (50 loc) · 1.61 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 package Maths; public class SumOfDigits { public static void main(String[] args) { assert sumOfDigits(-123) == 6 && sumOfDigitsRecursion(-123) == 6 && sumOfDigitsFast(-123) == 6; assert sumOfDigits(0) == 0 && sumOfDigitsRecursion(0) == 0 && sumOfDigitsFast(0) == 0; assert sumOfDigits(12345) == 15 && sumOfDigitsRecursion(12345) == 15 && sumOfDigitsFast(12345) == 15; } /** * Calculate the sum of digits of a number * * @param number the number contains digits * @return sum of digits of given {@code number} */ public static int sumOfDigits(int number) { number = number < 0 ? -number : number; /* calculate abs value */ int sum = 0; while (number != 0) { sum += number % 10; number /= 10; } return sum; } /** * Calculate the sum of digits of a number using recursion * * @param number the number contains digits * @return sum of digits of given {@code number} */ public static int sumOfDigitsRecursion(int number) { number = number < 0 ? -number : number; /* calculate abs value */ return number < 10 ? number : number % 10 + sumOfDigitsRecursion(number / 10); } /** * Calculate the sum of digits of a number using char array * * @param number the number contains digits * @return sum of digits of given {@code number} */ public static int sumOfDigitsFast(int number) { number = number < 0 ? -number : number; /* calculate abs value */ char[] digits = (number + "").toCharArray(); int sum = 0; for (int i = 0; i < digits.length; ++i) { sum += digits[i] - '0'; } return sum; } } |
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