Question

I currently have a function which will take an input and round it to 4 decimal places, it looks like this:

    public static double table_round(double n) {
    return (double) Math.round(n * 10000) / 10000;
}

really really simple function, however I was thinking I could change it to allow a second variable to be passed that says how many places to round to, however I’m not sure exactly how to go about printing the correct number of 0’s in the math statement there (each 0 represents one decimal place that will be printed). Any ideas on how this could be accomplished? This is just some extra credit stuff for my java class, I’m still learning so I’m sorry if there is a simple solution I’m overlooking.

Answer 1

public static double table_round(double n, int digits) {
    return BigDecimal.valueOf(n).setScale(digits,BigDecimal.ROUND_HALF_UP).doubleValue();
}