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Thread: How to do simple formatting in java times tables?

  1. #1
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    Default How to do simple formatting in java times tables?

    Here is my code

    import javax.swing.*;
     
    public class lab8a
    {
      int rc = 0;
     
     
    public static void main(String[] args)
    {
        lab8a t = new lab8a();
        t.process();
    }
     
     
    int process()
    {
        boolean keepgoing = true;
        while(keepgoing)
        {
            rc = userPrompt();
            if(rc == 0)
            {
                keepgoing = false;
                continue;
            }
            rc = calcTable(rc);
        } //End of while
        return rc;
    } //End of method
     
     
    int calcTable(int n)
    {
        int width = n;
        int length = n;
     
        int i,j;
        int threeD[][] = new int[length][width];
        for (i=0; i < length; i++)
        {
     
            System.out.println("");
     
            for(j=0; j < width; j++)
            {
     
     
                {
     
                    threeD[i][j]= (i+1)*(j+1);
     
     
     
                    System.out.printf("%4d ",threeD[i][j]);
                    System.out.printf("%4d ",threeD[i] + "|");
                    System.out.printf("%4d ",threeD[j] + "_");
     
                }
     
            }
        }
        return 0;
    } //End of method
     
     
    public int userPrompt()
    {
        String ans = JOptionPane.showInputDialog(null,
                "Please enter a number between 1 and 32");
        if (ans == null)
        {
            return 0;
        }
        else
        {
            int n = Integer.parseInt(ans);
            return n;
        }
    }
     
    }

    im working with in java, i'm trying to figure out how to get a nice border around the first row and column in my times table. Something like "|" and "_" . Any ideas?
    I put the formatting under the System.out.println but it is giving me these errors
    Exception in thread "main" java.util.IllegalFormatConversionException: d != java.lang.String
    at java.util.Formatter$FormatSpecifier.failConversion (Formatter.java:3999)
    at java.util.Formatter$FormatSpecifier.printInteger(F ormatter.java:2709)
    at java.util.Formatter$FormatSpecifier.print(Formatte r.java:2661)
    at java.util.Formatter.format(Formatter.java:2433)
    at java.io.PrintStream.format(PrintStream.java:920)
    at java.io.PrintStream.printf(PrintStream.java:821)
    at lab8a.calcTable(lab8a.java:55)
    at lab8a.process(lab8a.java:26)
    at lab8a.main(lab8a.java:11)
    Last edited by helloworld922; December 19th, 2011 at 01:02 PM.


  2. #2
    Senile Half-Wit Freaky Chris's Avatar
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    Default Re: How to do simple formatting in java times tables?

    "%4d ",threeD[j] + "_"

    Here you specify that you are passing the first argument in as a double, then pass it a string.

    Chris
    chris[at]javaprogrammingforums[dot]com

    Prifysgol Bangor University, North Wales

  3. #3
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    Default Re: How to do simple formatting in java times tables?

    ok i changed that but still im getting crappy results the "|" and "_" are still within the time table not just within the first row and column

  4. #4
    Senile Half-Wit Freaky Chris's Avatar
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    Default Re: How to do simple formatting in java times tables?

    only print them if i = 0
    chris[at]javaprogrammingforums[dot]com

    Prifysgol Bangor University, North Wales

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