Output Problem with my problem help please

Question

Here is the Instruction to the problem:
An interesting problem in number theory is sometimes called the ?necklace problem.? This problem begins with two single-digit numbers. The next number is obtained by adding the first two numbers together and saving only the ones-digit. This process is repeated until the ?necklace? closes by returning to the original two numbers. For example, if the starting numbers are 1 and 8, the output would look like:
18976392134718
and below is my program:
public class Necklace
     public static void main(String[] args)
          int f, s, sum, n, p;
          String first = JOptionPane.showInputDialog ("Enter first number:");
          String second = JOptionPane.showInputDialog ("Enter second number:");
          f = Integer.parseInt (first);
          s = Integer.parseInt (second);
          sum = f + s;
          n = sum % 10;
          p = s;
          while (!(p == f && n ==s))
               sum = n + p;
               p = n;
               n = sum % 10;
          String output = f +""+ s +""+ ++n+"";
          JOptionPane.showMessageDialog (null, output, "Necklace", JOptionPane.INFORMATION_MESSAGE);
My problem is that I don't know or have any idea how to make the output so it will show all the numbers in between, my ouput it only show the first 3 number, 1 8 and 9

Answer 1

My problem is that I don't know or have any idea how to make the output so it will show all the numbers in between, my ouput it only show the first 3 number, 1 8 and 9Hello and welcome to the forum. First and foremost, please use code tags when posting code here so that your code will retain its formatting and thus will be readable -- after all, your goal is to get as many people to read your post and understand your code as possible, right?
To do this, highlight your pasted code (please be sure that it is already formatted when you paste it into the forum; the code tags don't magically format unformatted code) and then press the code button, and your code will have tags.
Another way to do this is to manually place the tags into your code by placing the tag [code] above your pasted code and the tag [code] below your pasted code like so:
[code]
  // your code goes here
  // notice how the top and bottom tags are different
[/code]For instance, here is your code with tags:
import javax.swing.JOptionPane;
public class Necklace {
   public static void main(String[] args) {
      int f, s, sum, n, p;
      String first = JOptionPane.showInputDialog("Enter first number:");
      String second = JOptionPane.showInputDialog("Enter second number:");
      f = Integer.parseInt(first);
      s = Integer.parseInt(second);
      sum = f + s;
      n = sum % 10;
      p = s;
      while (!(p == f && n == s))
         sum = n + p;
         p = n;
         n = sum % 10;
      String output = f + "" + s + "" + ++n + "";
      JOptionPane.showMessageDialog(null, output, "Necklace",
               JOptionPane.INFORMATION_MESSAGE);
}Next, you can declare your output String before the while loop, and then concatonate a new int on to this inside the loop. Perhaps an even better way is to use a StringBuilder object.