Round to 2 decimal places [duplicate]

Question

Possible Duplicate:
Round a double to 2 significant figures after decimal point

I have:

mkm=((((amountdrug/fluidvol)*1000)/60)*infrate)/ptwt;  

in my Java code. The code works fine but returns to several decimal places. How do I limit it to just 2 or 3?

Answer 1

Don't use doubles. You can lose some precision. Here's a general purpose function.

public static double round(double unrounded, int precision, int roundingMode) {     BigDecimal bd = new BigDecimal(unrounded);     BigDecimal rounded = bd.setScale(precision, roundingMode);     return rounded.doubleValue(); } 

You can call it with

round(yourNumber, 3, BigDecimal.ROUND_HALF_UP); 

"precision" being the number of decimal points you desire.