asked on

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

biloonline

ASKER

I guess I have mis-used the declaration I was given.

Mick Barry

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.

Mick Barry

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.

biloonline

ASKER

I guess I know how to do it, I 'll give it a shot and see how it goes.

Thanks objects for youe assistance.

biloonline

ASKER

<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

ASKER CERTIFIED SOLUTION

Mick Barry

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thomas908

your code (that is "for" loop) is outside the method. put it within the method sumDigits().

thomas908

i'd suggest using the approach mentioned by objects above.

thomas908

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);
      }
}