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  1. #1
    RojBlake is offline Member
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    Aug 2012
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    Default Removing decimals from double


    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:

    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!!

  2. #2
    DarrylBurke's Avatar
    DarrylBurke is offline Forum Police
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    Sep 2008
    Madgaon, Goa, India
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    Default Re: Removing decimals from double

    If you're forever cleaning cobwebs, it's time to get rid of the spiders.

  3. #3
    Norm's Avatar
    Norm is offline Moderator
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    Jun 2008
    Eastern Florida
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    Default Re: Removing decimals from double

    rid of the decimal completely.
    Cast the double to an int
    If you don't understand my response, don't ignore it, ask a question.

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