On the "GWT Browser" they are still Java (hosted mode). In actual
browsers they are JavaScript.
You will get different results in browsers because JavaScript only has
64 bit floats.
The GWT docs put it this way:
" * Intrinsic types: Primitive types (boolean, byte, char, short,
int, long, float, and double), Object, String, arrays, user-defined
classes, etc. are all supported, with a couple of caveats.
o Arithmetic: In JavaScript, the only available numeric type
is a 64-bit floating point value. All Java primitive numeric types
(except for long, see below), are therefore implemented in web mode as
if on doubles. Primarily, that means overflowing an integral data type
(byte, char, short, int) will not wrap the underlying value as Java
specifies. Instead, the resulting value will outside of the legal
range for that data type. Operations on float are performed as double
and will result in more-than-expected precision. Integer division is
implemented to explicitly round to the correct value.
o long: JavaScript has no 64-bit integral type, so long
needs special consideration. Prior to GWT 1.5, the long type was was
simply mapped to the integral range of a 64-bit JavaScript floating-
point value, giving long variables an actual range less than the full
64 bits. As of GWT 1.5, long primitives are emulated as a pair of 32-
bit integers, and work reliably over the entire 64-bit range. Overflow
is emulated to match the expected behavior. There are a couple of
caveats. Heavy use of long operations will have a performance impact
due to the underlying emulation. Additionally, long primitives cannot
be used in
JSNI code
because they are not a native JavaScript numeric type. "
http://code.google.com/docreader/#p=google-web-toolkit-doc-1-5&s=google-web-toolkit-doc-1-5&t=DevGuideJavaCompatibility
You might want to try to use different types, or format - or if you
need the precision, and don't want it to vary, try something like gwt-
math - http://code.google.com/p/gwt-math/ .
On Feb 24, 9:52 am, "tony.p.." <[email protected]> wrote:
> Hello everyone,
>
> I'm getting strange behavior for float numbers. I'm processing data on
> the server, reading it from a file. The data consists of strings,
> floats and integers. I read them all as Strings, then process their
> actual values. Then when I display them, on the GWT client, via RPC, I
> get this:
>
> -15.2 becomes -15.199999809265136
> 1.2 becomes 1.2000000476837158
> 0.2 becomes 0.20000000298023224
> 1.4 becomes 1.399999976158142
>
> on FF/IE/Chrome on Windows and FF on Linux. They are only displayed
> correctly on the GWT browser.
>
> If you know what is causing this or how I can fix it, please let me
> know.
>
> Thank you,
> Tony
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