Solved

Help NEEDED. Need some assistance with my Java code.

Posted on 2004-09-30
11
220 Views
Last Modified: 2008-01-09
I am asked a write a method that computes the sum of the digits in an integer and I am asked to use the following methhod declaration:

public staticint SumDigits(long n)

For example, sumDigits(123) returns 1+2+3 = 9

Here 's what I've gotten so far:

<code>
import java.io.*;

class Hw3Pr4 {
      public static int sumDigits(long n) throws IOException {
            BufferedReader stdin  = new BufferedReader (new InputStreamReader(System.in));
            
            int number, sum = 0;
            System.out.println("Enter an integer: ");
            
            String numberString = stdin.readLine();
            number = Integer.parseInt(numberString);
            // Sum the digits entered
            sum += number % 10;
        number /= 10;
        sum += number % 10;
        sum += number / 10;
       
        System.out.println("Sum of all digits: " + sum);
      }
}

</code>

I did not know whether to include the public static void main(String[] args) at the very first.

Please advise, am I on the right track?

Thanks
0
Comment
Question by:biloonline
  • 3
  • 3
  • 3
11 Comments
 

Author Comment

by:biloonline
ID: 12196548
I guess I have mis-used the declaration I was given.
0
 
LVL 92

Expert Comment

by:objects
ID: 12196554
you should be calculating the sun of the digits in 'n' shouldn't you (instead of prompting the user for a number)?

you'll need a main in the class you are using to test it.

0
 
LVL 92

Expert Comment

by:objects
ID: 12196566
as far as summing the digits you need to loop thru each digit, the code you have only deals with two digits.
another approach would be to convert the number to a string.
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:biloonline
ID: 12196573
I guess I know how to do it, I 'll give it a shot and see how it goes.

Thanks objects for youe assistance.
0
 

Author Comment

by:biloonline
ID: 12196611
<code>


class SumDigits      {
      public static int sumDigits(long n) {

      return 0;
      }



int sum = 0;


      for (int i = digt.length(); i > 0; i--) {

            sum += Character.digit(digt.charAt(i - 1),10);

            digt = digt.substring(0,i - 1);
            
            return sum;
            
            }


public static void main(String [] args) {
      
      System.out.println("SumDigits of " + args[0] + " = " +
      SumDigits.sumDigits(Long.parseLong(args[0])));


      }
}

</code>

Am I missing something?

I am getting 2 errors:

E:\Program Files\Xinox Software\JCreatorV3 LE\MyProjects\Hw3Pr1\SumDigits.java:13: illegal start of type
        for(int i = digt.length(); i > 0; i--) {
        ^
E:\Program Files\Xinox Software\JCreatorV3 LE\MyProjects\Hw3Pr1\SumDigits.java:29: <identifier> expected
        }
         ^
2 errors

Thank you
0
 
LVL 92

Accepted Solution

by:
objects earned 50 total points
ID: 12196639
>   return 0;
>     }

those lines don't look they should be there
0
 
LVL 8

Expert Comment

by:thomas908
ID: 12197490
your code (that is "for" loop) is outside the method. put it within the method sumDigits().
0
 
LVL 8

Expert Comment

by:thomas908
ID: 12197576
i'd suggest using the approach mentioned by objects above.
0
 
LVL 8

Expert Comment

by:thomas908
ID: 12197578
Something like

class Test
{
      public static void main(String[] args)
      {
            new Test().sumDigits(args[0]);
      }
      public void sumDigits(String s)
      {
        int sum = 0;

          for(int i=0; i<s.length(); i++)
            {
           
                  sum = sum + Character.getNumericValue(s.charAt(i));
            }
            System.out.println(sum);
      }
}
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
web services creation SOAP vs REST 5 80
Java exception bubble up 2 24
ejb entity bean example issue 2 25
learn programming 8 66
After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question