?
Solved

Help NEEDED. Need some assistance with my Java code.

Posted on 2004-09-30
11
Medium Priority
?
223 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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
Get real performance insights from real users

Key features:
- Total Pages Views and Load times
- Top Pages Viewed and Load Times
- Real Time Site Page Build Performance
- Users’ Browser and Platform Performance
- Geographic User Breakdown
- And more

 

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 200 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

Get real performance insights from real users

Key features:
- Total Pages Views and Load times
- Top Pages Viewed and Load Times
- Real Time Site Page Build Performance
- Users’ Browser and Platform Performance
- Geographic User Breakdown
- And more

Question has a verified solution.

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

Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
In this post we will learn how to make Android Gesture Tutorial and give different functionality whenever a user Touch or Scroll android screen.
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
Suggested Courses
Course of the Month13 days, 23 hours left to enroll

801 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