Removing decimal from double?

RojBlake

Hello!

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

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...
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...

Here is the code:

[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");


}

}
[CODE]

Thanks in advance for any replies!!

joet1984

Many ways to do it. You can use an integer instead of a double

double speedoflight, round;
int result;

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


******************
The difference between double and int is double has a decimal point value and int does not. (Also, the compiler sets aside more memory for a double so it can hold a larger value). If for some reason you needed the floor you could do

int resultWithoutDecimal;

resultWithoutDeciaml = (int) result;


*******************
The (int) before the result means you are casting a double to an int. You can read up on that if you are interested