Solved

What is the problem with 'double'?

Posted on 2004-04-12
5
229 Views
Last Modified: 2010-03-31
Here I attach the code segment and it output:

Code:

public static void main(String args[]){
    for(double d = 1; d >= 0; d -= 0.2){
        System.out.println(d);
    }
}

Output:

1.0
0.8
0.6000000000000001
0.4000000000000001
0.20000000000000007
5.551115123125783E-17

Why is this happened? and How to solve this problem if I am expecting the output of:

1.0
0.8
0.6
0.4
0.2
0.0

Thank You.
0
Comment
Question by:b612_forever
5 Comments
 
LVL 15

Assisted Solution

by:Javatm
Javatm earned 20 total points
ID: 10810092
This should solve your problem :

public static void main(String args[]) {

    DecimalFormat d1 = new DecimalFormat("0.0");

    for(double d = 1; d >= 0; d -= 0.2) {
    System.out.println(d1.format(d));
    }
}

Hope that helps . . .
Javatm
0
 
LVL 30

Assisted Solution

by:Mayank S
Mayank S earned 20 total points
ID: 10810540
Well, precision-related matters always come into picture while dealing with floats and sometimes also with doubles. You should never look for or compare exact values but keep a margin for error-tolerance while dealing with them.
0
 
LVL 24

Accepted Solution

by:
sciuriware earned 20 total points
ID: 10810805
Remember that a computer is binary organised: many floating numbers can't be represented in float or double
like PI in the decimal system.
;JOOP!
0
 
LVL 1

Author Comment

by:b612_forever
ID: 10810958
Since Javatm provide the solution and mayankeagle,scuriware provide the explanation, I add 10 point for this question and split it to three.
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10810991
Glad to help ;-)
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

For customizing the look of your lightweight component and making it look lucid like it was made of glass. Or: how to make your component more Apple-ish ;) This tip assumes your component to be of rectangular shape and completely opaque. (COD…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.

930 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now