# Removing decimals from double

• 08-18-2012, 01:37 PM
RojBlake
Removing decimals from double
Hello!

I've only just started learning Java, and I've just progressed from programs like "HelloWorld" and such :(happy):

I've written an extremely simple and basic program, that measures time dilation when a fictive space vessle travels close to the speed of light... :D:
It's working as I've intended, however, my ambition is to remove all decimals from the answer. For example if I get answer of 15.93848929393, I've used
Math.floor to round the double off, however now it will be displayed as 15.0 and I would like to be rid of the decimal completely.
Is there anybody who can give me a suggestion as to how to remove the decimal?
Please bear with me, I'm a complete noob at this, and there's a lot I still don't know and understand... :(sweat):

Here is the code:

import javax.swing.*;
import java.lang.Math;

public class TimeDilation {
public void dilation(){

double speedoflight, result, round;

speedoflight = Double.parseDouble(JOptionPane.showInputDialog("En ter lightspeed"));
result = 100*(Math.sqrt(1-(Math.pow(speedoflight, 2))));
round = Math.floor(result);

JOptionPane.showMessageDialog(null, "If you travel for 100 years on Earth " + round + " years will pass on The Magellan");

}

}

Thanks in advance for any replies!! :D:
• 08-18-2012, 02:02 PM
DarrylBurke
Re: Removing decimals from double
• 08-18-2012, 04:06 PM
Norm
Re: Removing decimals from double
Quote:

rid of the decimal completely.
Cast the double to an int