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Help NEEDED. Need some assistance with my Java code.

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
biloonline
Asked:
biloonline
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1 Solution
 
biloonlineAuthor Commented:
I guess I have mis-used the declaration I was given.
0
 
objectsCommented:
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
 
objectsCommented:
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
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biloonlineAuthor Commented:
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
 
biloonlineAuthor Commented:
<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
 
objectsCommented:
>   return 0;
>     }

those lines don't look they should be there
0
 
thomas908Commented:
your code (that is "for" loop) is outside the method. put it within the method sumDigits().
0
 
thomas908Commented:
i'd suggest using the approach mentioned by objects above.
0
 
thomas908Commented:
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

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