A double with 2 decimal places

Question

I need to output a double that has 2 decimal places. The default is just one and I don't know the command to make it two. For example,i want an output of 37.5 to be displayed as 37.50. If you know the command, please tell me. Thanks!

Answer 1

Looks like you are trying to deal with money.
Firstly if you are dealing with money store everything as the lowest form of currency in your given area. eg as pence or cents and place it in a int or long. That way you dont get any rounding erros when you multiply up the value.
To put two decimal places on a number is easy just use a DecimalFormat from java.text
Like this
double myNumber = 3.1;
DecimalFormat decF = new DecimalFormat( "######0.00" );
String myFormattedNumber = decF.format( myNumber );
System.out.print( "My number is " + myFormattedNumber ); The #######0.00 in the DecimalFormat constructor call is a pattern that is used to format the number. The # indicate an optional number the 0 indicates a required number and if one is not provided a 0 will be included.