Rounding up in java?

Energize · 24 Jan 2010 at 04:23

Is there a better way to round up numbers eg square roots than doing this? I can't find a method for rounding up in the Math class.

Code:

if (Math.sqrt(iterations) % 1 != 0) {
    System.out.println(Math.round(Math.sqrt(iterations) + 0.5));
} else {
    System.out.println(Math.round(Math.sqrt(iterations)));
}

dangerstat · 24 Jan 2010 at 05:00

Code:

public class lol {

	public static void main(String args[]){
		double lolz = 0.5111;
		double lolzy = Math.ceil(lolz);
		System.out.println(lolzy);
	}

}

Energize · 24 Jan 2010 at 21:08

Hey it's suns fault for not calling it "roundUp".

Dj_Jestar · 24 Jan 2010 at 21:59

or is in fact the standard method naming for ceiling, which is the opposite of floor

dangerstat · 24 Jan 2010 at 22:20

In fairness it threw me the first time I needed it, I spent ages thinking Java didn't have rounding up routine

Dj_Jestar · 24 Jan 2010 at 22:56

Hells yeah.. I wrote my own method for it before spotting it :/

Code:

public int RoundUp(double aNumber)
{
  if ((int)aNumber > aNumber)
    return (int)aNumber;

  if ((int)aNumber < aNumber)
    return (int)aNumber + 1;

  return (int)aNumber;
}