Double divide by 10 in java

Question

import java.util.*;
public class test {
    public static void main(String [] args) {
        Scanner scn = new Scanner(System.in);
        double s = 253.3;
        while(s > 9) {
            s = s/10;
        }
        System.out.println(s);
    }
}

Why the output is 2.5330000000000004 and not 2.533?

That kind of question is related to Numerical analysis which is studied by those who learn Informational Technology, Mathematics etc... Explaining that here I think is overkill. I suggest searching for that kind of books and reading them if you are interested! Even the answer from the provided link I think is not enough. I've spent one year at university learning such things :) — XMight, Oct 01 '14 at 14:59

score 2 · Accepted Answer · answered Oct 01 '14 at 14:54

2

Because floating point values are an approximation.

http://en.wikipedia.org/wiki/Floating_point

answered Oct 01 '14 at 14:54

khelwood

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1

True, but doesn't really provide much insight. – Robert Harvey Oct 01 '14 at 14:55
1

Thank you. actually i do not know what to search, that is why i'm posting here. This [http://floating-point-gui.de/basic/](http://floating-point-gui.de/basic/) also good! – Muhammad Ariff Oct 01 '14 at 15:06

Double divide by 10 in java

1 Answers1