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Question about the task

Sum of the digits of a three-digit number

Java Syntax, Level 3, Lesson 12

Resolved

What's wrong?

Write the code for sumDigitsInNumber(int number). The method takes a three-digit whole number. You need to calculate the sum of the digits of this number, and then return the result.

Consider this example:
The sumDigitsInNumber method is called with the argument 546.

Example output:
15

Requirements:

The program must not read data from the keyboard.
The sumDigitsInNumber(int) method must be public and static.
The sumDigitsInNumber method must return an int.
The sumDigitsInNumber method should not display anything.
The sumDigitsInNumber method must return the sum of all digits in the parameter number.

package com.codegym.task.task01.task0132; /* Sum of the digits of a three-digit number */ ; public class Solution { public static void main(String[] args) { System.out.println(sumDigitsInNumber(546)); } public static int sumDigitsInNumber(int number) { int s = 0; while(number > 0) { s = s + number % 10; number = (int) number / 10; } return s; } }

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Alexsey

Level 31 , Minsk, Belarus

1 May 2019, 13:40

It's too difficult for me :)

Paravoffka

Level 18 , Vancouver, Canada

27 April 2019, 05:13

This code also works well: public static int sumDigitsInNumber(int number) { int result = number/100 + (number/10-(number/100) *10) + number % 10; return result;

illia

Level 8 , Portland, United States

21 June 2019, 00:44

thank you

Guadalupe Gagnon

Level 37 , Tampa, United States

28 February 2019, 14:48

Try resetting the task, you can just copy your code first then paste it back in. Also remove any unnecessary code, like: number = (int) number / 10; ↑ number is already an int, this is not doing anything. If these don't work then this task may be bugged. I ran into a bugged task when I was going through the levels. Message codegym about this task and let them know that the verification is not working on this task. They will clear it up next time the website updates.

Alexsey

Level 31 , Minsk, Belarus

28 February 2019, 14:56

Thank you!

Guadalupe Gagnon

Level 37 , Tampa, United States

28 February 2019, 15:21

No problem. You are going to run into plenty tasks that have very picky validation systems, even though your code will be correct. A couple of tips for the future when a task fails verification and you don't know why. #1 re-read the task conditions and the task requirements carefully. Some tasks the conditions have different wording than the requirements, and one is correct while the other is not. #2 check the output of your program to make sure it matches EXACTLY what the task says to do. I see a lot of people fail because they output more. For example in the task above some people would output "Digits sum: 15", and that is an automatic fail. But most fail because they forget to end a sentence with a period or forget to capitalize a letter. #3 Too much code can fail a task too, I always recommend keeping it as simple as possible. These are beginner lessons/tasks, don't go overboard with programming the heck out of them. I've seen plenty of tasks pass after removing whole blocks of unnecessary code, even though the outputs were identical. #4 Try resetting, strangely enough sometimes a reset fixes problems. #5 and if all else fails, don't be afraid to ask for help. Sometimes an outside observer can pick the problem(s) out that you just can not see, and you will probably slap yourself for not seeing it once pointed out. My last tip is don't get too frustrated, programming is best learned by failing at it a lot. Its called practice, and codegym has plenty of that. I had tasks where I would fail over 20 times before passing, and even one task I failed close to 80 times. Good luck!

Mark Fernandez

Level 17 , Mumbai, Mexico

28 February 2019, 21:27

Thanks Guadalupe for the tips as well as the encouragement