How to format floats (or doubles ) but not converting to String?

Question

Hi everybody,
my question is simple:
I have a number,lets say 51,4567321 and i want to format it ,as a float or double ,as 51,45.
One way is to do:
float x=((hits * (float) 100) / this.getAccesses());
DecimalFormat perCentFormatter = new DecimalFormat("00.00");
String formattedNum=this.perCentFormatter.format(x);and that will create a string "51,45".
But how do i do to create a float or double or anything else that holds the value with 2 decimal points after mantissa?e.g XX,XX
Thank you very much,
Chris

Answer 1

A few options:
1) just live with it. The float and double formats hold their values in binary, you know, and you only have approximations of multiples of tenth and one-hundreds of unity. It's all just approximations for those types. C'est la vie.
2) Use java.math.BigDecimal, which gives you control over rounding.
3) Change your design, so you use integers with the lower unit. So if the float currently "51,23" represents 51 Euros and 23 cents (what's the word? Europennies?), then you'd use an int of 5123 to represent five thousand one hundred and twenty-three cents.