Rounding a Double

[Jazz]

Hello All I would like to round a double to 2 decimal places...

I have the following two integers:
protected int stackEmptiedCount; //the number of times a stack is Emptied
protected int noOfPlates; //number of Plates

Then I want to display it:
System.out.println("Average stack size before emptying: " +
noOfPlates/stackEmptiedCount + "\n");

Obviously it gets truncated...cause its a integer...any easy way to display
it as say a 2.47...

Thanks

Jazz

 

[Andrew Thompson]

Hello All I would like to round a double to 2 decimal places...

You need to look into.. java.text.NumberFormat

HTH

 

[Michael Borgwardt]

Then I want to display it:
System.out.println("Average stack size before emptying: " +
noOfPlates/stackEmptiedCount + "\n");

Obviously it gets truncated...cause its a integer...any easy way to display
it as say a 2.47...

To do a double division, cast one of the arguments to double.
To display only two decimal places, use java.text.DecimalFormat

 

[=?ISO-8859-1?Q?=D2scar_P=E9rez_del_Campo?=]

Simply do as follows:

java.text.NumberFormat nf;
nf = NumberFormat.getInstance();
nf.setMinimumFractionDigits(2);
nf.setMaximumFractionDigits(2);
System.out.println("bla bla bla:
"+nf.format(((double)noOfPlates)/((ddouble)stackEmptiedCount)));

 

[Dave Monroe]

You need to look into.. java.text.NumberFormat

HTH

.. . . and its decendant DecimalFormat.

 

[Roedy Green]

Hello All I would like to round a double to 2 decimal places...

There are two related problems:
1. round a double two decimal places ending up with a double.
2. convert a double to display with two decimal places, ending up with
String.

See http://mindprod.com/jgloss/round.html for the first
and
http://mindprod.com/converter.html for the second.