String formatting according to number of decimal points

Question

I want to write a string of variable values in a formatted way, according to the following:

Maximum decimal points is 3. If there are less than 3 significant points than less are written.

For example: the number 1.53848 will be written as 1.538 the number 1.0 will be written as 1 (rather than 1.000).

val variable1 = 1.
val variable2 = 1.53848
language = "%s average value is %.3f and %.3f".format(variable1, variable2)

Answer 1

This should do the trick:

def format(d: Double) =
    BigDecimal(d).scale match {
        case x if x > 2 => "%.3f".format(d)
        case _ => d.toInt.toString
    }

Answer 2

How about just removing the zeroes (and possibly the comma/separator character)?

def formatted(d: Double) = "%.3f".format(d).replaceAll(",?0+$", "")