Round to 2 decimal places [duplicate]

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?

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.

Just use Math.round()

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

mkm= (double)(Math.round(mkm*100))/100;

double formattedNumber = Double.parseDouble(new DecimalFormat("#.##").format(unformattedNumber));

worked for me :)