keep double accurate to two decimal places

[africanhacker]

Hie guys I have a double variable that holds product costs after multiplying cost per kg with the actual weight selected. How do I keep the numbers accurate to just two decimal places. I don't want numbers like $2.555555578, instead I need $2.55. Please help.

[DarrylBurke]

Use BigDecimal. Or if it's just the display of the numbers that's bothering you, DecimalFormat.

db

[africanhacker]

Thanks for that, Decimal Format did it. Some rep for you :D

[Iron Lion]

Alternatively, you might want to consider using an int and keeping track of the amount in cents instead of dollars.

[africanhacker]

@Iron Lion

That is really clever. I had actually never thought of that.

In real world application how is it done?

[DarrylBurke]

In real world applications, floating point is (almost) never used for currency calculations. Integral types are used for the lowest currency unit and the decimal point is inserted for display/printout purposes only.

db