beginner precision question

[Tod Novak]

Below is just a sample of what I'm trying to get a grasp on.

I'm trying to figure out how to get both places to display after the decimal when both are zeros.

    
import java.io.*;
import java.util.Scanner;
 
public class DoubleTest
{
    public static void main(String[] args)
    {
        // in cents, not dollars
        final int underShip = 200; //if item is under a certain amount, this is shipping cost
        final int overShip = 300; //if over a certain amount, use this 
        
        Scanner scan = new Scanner(System.in);
        int price; // input in cents (i.e. 1000 = $10.00)
        
        System.out.println("Enter price: ");
        price = scan.nextInt();
        
        if (price <= 1000)
        {
            System.out.println("Total: " + ((price + underShip) / 100d));
        }
        else
        {
            System.out.println("Total: " + ((price + overShip) / 100d));
        }
        
    }
}

Again, this is just to illustrate.

If I input 1000 ($10.00) as price, I would expect to get back 12.00 as the result, not 12.0

Thanks in advance.

[Rob Spoor]

Use System.out.printf instead of System.out.println. Check PrintWriter.printf for more information; keep in mind it does NOT print an enter unless you tell it to.

[Mark Vedder]

Take a look at the JavaDoc for the DecimalFormat class. It is a class used to format Decimal numbers like you are trying to do. The DecimalFormat class is a subclass of the NumberFormat.

You can then look at Java Tutorial on Formatting Numeric Output. That lesson first talks about the System class' printf() and format() methods, and then the DecimalFormat class.

You can also find examples of using the DecimalFormat class on exampledepot.com
[ May 15, 2008: Message edited by: Mark Vedder ]

[Campbell Ritchie]

Agree with Rob Prime. More details about the tags with % in the Formatter clas API documentation. Use %n instead of \n after printf to go onto a new line.

[Tod Novak]

Thanks all.

Got some reading to do

Appreciate the help.

[arulk pillai]

I would prefer using a DecimalFormat class with Log4J.

 
      double value = 3.56;
      DecimalFormat df = new DecimalFormat("#,##0.00");
      logger.log(df.format(value ));

[ May 15, 2008: Message edited by: arulk pillai ]