in Java, how to delete all 0s in float?

Question

I'd like to change float like this way:

10.5000 -> 10.5 10.0000 -> 10

How can I delete all zeros after the decimal point, and change it either float (if there's non-zeros) or int (if there were only zeros)?

Thanks in advance.

I don't quite understand. The zeros are just a product of the textual representation, they have nothing to do with how the float is internally represented. Are you looking for custom output formats suppressing trailing zeros? — Daniel Fischer, Dec 01 '11 at 20:02

score 18 · Answer 1 · answered Dec 01 '11 at 20:04

18

Well the trick is that floats and doubles themselves don't really have trailing zeros per se; it's just the way they are printed (or initialized as literals) that might show them. Consider these examples:

Float.toString(10.5000); // => "10.5"
Float.toString(10.0000); // => "10.0"

You can use a DecimalFormat to fix the example of "10.0":

new java.text.DecimalFormat("#").format(10.0); // => "10"

answered Dec 01 '11 at 20:04

maerics

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+1 for DecimalFormat. Additionally decimal format using half even rounding. http://docs.oracle.com/javase/tutorial/i18n/format/decimalFormat.html – HRgiger Dec 01 '11 at 20:27
Thanks a lot. I did not clarify that I was actually working on Processing. The regexp was simpler flor my case. – clerksx Dec 01 '11 at 21:17

Nthalk · Accepted Answer · 2011-12-01T21:09:38.923

17

Why not try regexp?

new Float(10.25000f).toString().replaceAll("\\.?0*$", "")

edited Dec 01 '11 at 21:09

answered Dec 01 '11 at 20:03

Nthalk

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This doesn't quite make sense because `new Float(10.25000f).toString()` already gives you "10.25" so `.replaceAll("0*$", "")` is of no use. – Bhesh Gurung Dec 01 '11 at 20:17
1

`"\.0+$"` if you want to also get rid of the period. – Marcelo Dec 01 '11 at 20:17
If I change "0*$" to "\.0+$", it says "unexpected char: '.'" - I'm on Processing actually. – clerksx Dec 01 '11 at 21:01
1

@user1076206 Must escape the backslash, "\\.0+$". – Daniel Fischer Dec 01 '11 at 21:11
Thanks Daniel, it worked. I also used replaceAll("0*$", "").replace(".", " "). Actually for visual reason, I added a white space at the end. – clerksx Dec 01 '11 at 21:16

Paras Santoki · Answer 3 · 2020-08-25T10:03:59.460

2

You just need to use format class like following:

new java.text.DecimalFormat("#.#").format(10.50000);

edited Aug 25 '20 at 10:03

answered Apr 17 '18 at 11:00

Paras Santoki

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Sarel Botha · Answer 4 · 2018-04-23T17:42:25.453

2

This handles it with two different formatters:

double d = 10.5F;
DecimalFormat formatter = new DecimalFormat("0");
DecimalFormat decimalFormatter = new DecimalFormat("0.0");
String s;
if (d % 1L > 0L) s = decimalFormatter.format(d);
else s = formatter.format(d);

System.out.println("s: " + s);

edited Apr 23 '18 at 17:42

answered Dec 01 '11 at 20:03

Sarel Botha

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Shaun · Answer 5 · 2011-12-01T20:09:23.863

2

java.math.BigDecimal has a stripTrailingZeros() method, which will achieve what you're looking for.

BigDecimal myDecimal = new BigDecimal(myValue);
myDecimal.stripTrailingZeros();
myValue = myDecimal.floatValue();

edited Dec 01 '11 at 20:09

answered Dec 01 '11 at 20:04

Shaun

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score 1 · Answer 6 · answered Dec 01 '11 at 20:00

1

Format your numbers for your output as required. You cannot delete the internal "0" values.

answered Dec 01 '11 at 20:00

Udo Held

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score 0 · Answer 7 · edited May 23 '17 at 12:09

0

I had the same issue and find a workaround in the following link: StackOverFlow - How to nicely format floating numbers to string without unnecessary decimal 0

The answer from JasonD was the one I followed. It's not locale-dependent which was good for my issue and didn't have any problem with long values.

Hope this help.

ADDING CONTENT FROM LINK ABOVE:

public static String fmt(double d) {
    if(d == (long) d)
        return String.format("%d",(long)d);
    else
        return String.format("%s",d);
    }

Produces:

edited May 23 '17 at 12:09

Community

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answered Jul 23 '15 at 10:53

Jacqueline Rodriguez

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Can you add some content from the link? – Robert Jul 23 '15 at 11:14

score 0 · Answer 8 · answered Dec 01 '11 at 20:02

0

Try using System.out.format

Heres a link which allows c style formatting http://docs.oracle.com/javase/tutorial/java/data/numberformat.html

answered Dec 01 '11 at 20:02

Sid Malani

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in Java, how to delete all 0s in float?

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