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Thread: decimal format not working

  1. #1
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    Default decimal format not working

    import java.util.Formatter;
        import java.util.*; 
        import java.text.DecimalFormat;
     
    public class program5c
        {   
            static DecimalFormat df=new DecimalFormat("#.##"); 
    System.out.printf("%-15s", df.format(number));
    }

    Anyway I can get the printf feature to work with decimal format?


  2. #2
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    Default Re: decimal format not working

    Please post the program's output that shows the problem. Add some comments saying what is wrong with the output and show what you want the output to be.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: decimal format not working

    Employee Payroll (Sorted by last name)
    F.Name          L.Name     Hourly Wage     Hours Worked Gross Pay  20% Tax    Net Pay   
    Paul            Allen            $21.50           34       731.0      146.20000000000002 584.8     
    Steve           Ballmer       $18.75           35        656.25     131.25     525.0     
    Bill            Gates            $18.50           40        740.0      148.0      592.0     
    Steve           Jobs          $10.75           25         268.75     53.75      215.0     
    John            Smith         $14.75           30         442.5      88.5       354.0     
     
    Total Hours     Total Gross     Total Net       Highest Net Pay
    164              2838.5              2270.8

    Basically I want all the decimal outputs to be to 2 decimal places. I'm not getting any errors but the program doesn't seem to do that. Also all the numbers are in a string array so I have to use Double.parseDouble to convert them to doubles and then output.

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    Default Re: decimal format not working

    Please post an example of the current output and add some comments to it showing what you want the output to be.
    For example:
    current: 1.23445
    desired: 1.2

    Also post the code that creates the current output.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: decimal format not working

    This is the output:
    Employee Payroll (Sorted by last name)
    F.Name          L.Name     Hourly Wage     Hours Worked Gross Pay  20% Tax    Net Pay   
    Paul            Allen           $21.50           34         731.0      146.20000000000002 584.8     
    Steve           Ballmer         $18.75           35         656.25     131.25     525.0     
    Bill            Gates           $18.50           40         740.0      148.0      592.0     
    Steve           Jobs            $10.75           25         268.75     53.75      215.0     
    John            Smith           $14.75           30         442.5      88.5       354.0     
     
    Total Hours     Total Gross     Total Net       Highest Net Pay
    164.0           $2838.5          $2270.8          Bill Gates

    I want gross pay, tax, and netpay to show 2 decimal places. Example: 731.0 should be 731.00, and 584.8 should be 584.80.



    Code of functin that makes the current output:

     static public void chart(String value, String value2[][])
            {
                System.out.println("Employee Payroll (Sorted by last name)");
    //headings
                System.out.printf( "%-15s %-10s %-15s %-10s %-10s %-10s %-10s", "F.Name", "L.Name", "Hourly Wage", "Hours Worked", "Gross Pay", "20% Tax", "Net Pay" );
                System.out.println();
    //data for each employee
                for(int x = 0; x<=value2.length-2;x++)
                {
     
                    System.out.printf("%-15s %-15s $%-15s %-10s %-10s %-10s %-10s", value2[x][0],value2[x][1], value2[x][2],value2[x][3],value2[x][4],value2[x][5], value2[x][6]);
     
                    System.out.println();
     
                }
     
                System.out.println();
    //total employee values
                System.out.printf( "%-15s %-15s %-15s %-10s", "Total Hours", "Total Gross", "Total Net", "Highest Net Pay" );
                System.out.println();
     
                System.out.printf( "%-15s $%-15s $%-15s %-10s", value2[5][0],value2[5][1],value2[5][2], value);
     
                }
            }

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    Default Re: decimal format not working

    Read the API doc for the DecimalFormat class to see what format characters will give you the minimum fractional digits.

    Where is the DecimalFormat class used in the code that was just posted?

    Which printf() statement and format is wrong? There are too many to easily sort through. Just post the ONE printf that is causing the problem, not all of them.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: decimal format not working

    I found part of the problem, it doesn't add 2 decimal places if there is only 1 decimal place. 8.5 doesn't turn into 8.50. I just need a way to add a 0 if it has only 1 decimal place

  8. #8
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    Default Re: decimal format not working

    Look at the definition for the format strings in the API doc for the class and method you are using. There are several examples there on different ways to do it.
    If you don't understand my answer, don't ignore it, ask a question.

  9. #9
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    Default Re: decimal format not working

    This works

    DecimalFormat df=new DecimalFormat("#.00");

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