round to nearest nice number

Question

I\'m writing an application which requires rounding labels to the nearest \'nice\' number. I\'ll put some code below to demonstrate this, but my issue is that I was using a ser

Answer 1

I came up with this quite crude solution, which returns the correct values for all of the cases I tested just now:

public static double foo(long value) {
    for (double i = 0.2; true; i *= 5) {
        if (i >= value) {
            return i / 5;
        }
    }
}

Although I must admit that a mathematical solution as posted by Groo would be more beautiful. ;)