Formatting of double to not include decimal places

Question

The code below is what I have. I am a fairly new programmer going through my first Java class so bear with me.

import salespersonannualcomp.SalespersonCompensationAnnualCalculator; import java.util.Scanner; public class SalespersonAnnualSalesInput { public static void main( String[] args) { Scanner input = new Scanner( System.in ); //Instantiates a new instance of SalespersonCompensationAnnualCalculator SalespersonCompensationAnnualCalculator myAnnualSales = new SalespersonCompensationAnnualCalculator(); //Prompt for and input total annual sales System.out.println( "Please enter the total annual sales:" ); String yearlySalesString = input.nextLine(); //Declares yearlySalesInt as the variable that will store the results of Integer.parseInt int yearlySalesInt = Integer.parseInt(yearlySalesString); //Declares calcResults as the variable that will store the value created by the calcAnnualCompensation method double calcResults = myAnnualSales.calcAnnualCompensation(yearlySalesInt); //Displays the result of the calculations done for determining total annual compensation System.out.println(" Total Annual compensation is $"+ calcResults); System.out.println(); System.out.println(" Total Potential Annual Compensation Chart"); for(double potentialAnnualSales = yearlySalesInt;potentialAnnualSales<=(1.5*yearlySalesInt);potentialAnnualSales=potentialAnnualSales+5000) { double calcAnnualCompensation=myAnnualSales.calcAnnualCompensation(potentialAnnualSales); System.out.printf( "%f %f%n ",potentialAnnualSales,calcAnnualCompensation); } } }

The resulting output looks like this.

Total Annual compensation is $60400.0 Total Potential Annual Compensation Chart 160000.000000 60400.000000 165000.000000 60725.000000 170000.000000 61050.000000 175000.000000 61375.000000 180000.000000 61700.000000 185000.000000 62025.000000 190000.000000 62350.000000 195000.000000 62675.000000 200000.000000 63000.000000 205000.000000 63325.000000 210000.000000 63650.000000 215000.000000 63975.000000 220000.000000 64300.000000 225000.000000 64625.000000 230000.000000 64950.000000 235000.000000 65275.000000 240000.000000 65600.000000

I would like for it to not display the decimal places, and for all the lines to align correctly. I have the output correct but I'm struggling with the formatting.

Todd · Accepted Answer · 2015-01-17 23:09:18Z

You are close...

If you want no places after the decimal, and to line it up:

System.out.printf( "%10.0f %10.0f%n ",potentialAnnualSales,calcAnnualCompensation);

If you want two places after the decimal:

System.out.printf( "%10.2f %10.2f%n ",potentialAnnualSales,calcAnnualCompensation);

Essentially, 10.2f means 10 spaces to the left of the decimal (using spaces for padding) and 2 after. Similarly, 6.0f would mean 6 spaces to the left of the decimal and none after. You'll have to play with the number of spaces for your specific use case.

Bohemian · Accepted Answer · 2015-01-17 22:57:41Z

1

Use either:

new DecimalFormat("#").format(d)

Or:

(int)Math.round(d)

answered Jan 17, 2015 at 22:57

Bohemian♦

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Comments

Jeremy Farrell · Accepted Answer · 2015-01-17 23:04:42Z

In general using double's for monetary calculations is a bad practice. Instead use BigDecimal. To get rid of the trailing decimals call setScale(0); on your instance. For better formatting use NumberFormat.

5gon12eder · Accepted Answer · 2015-01-17 23:17:21Z

You can tell printf how many decimal places to print as well as how wide to make each field. The syntax is like so: %<WIDTH>.<PRECISION>f where <WIDTH> and <PRECISION> are to be replaced by non-negative integers. Both numbers are optional and you can leave them out if you want the defaults.

Here I am printing some random numbers with column width of 10 characters and a precision of 2 decimal places.

public class Test { public static void main(String[] args) { for (int i = 0; i < 6; ++i) { System.out.printf("%10.2f%10.2f%10.2f%10.2f%n", 100000.0 * Math.random() * Math.random(), 100000.0 * Math.random() * Math.random(), 100000.0 * Math.random() * Math.random(), 100000.0 * Math.random() * Math.random()); } } }

Possible Output:

 72411.07 11074.66 4722.24 74523.64 264.89 54015.77 53969.66 61229.94 5386.74 7939.65 47678.67 24953.68 4985.14 17769.77 17345.57 38392.68 4841.93 4103.14 3581.99 74036.73 52477.30 1846.34 35547.62 10065.36

If I change the format specifiers from %10.2f to %10.0f it will only print the integral part and I might get the following output instead:

 42116 26756 3293 7957 1693 23516 83116 39032 3981 40417 53635 19735 53504 77468 12341 16178 4424 81325 79304 5460 23825 6004 16507 37537

For more advanced features of printf, see the documentation of java.util.Formatter.

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