Has anyone ever tried to pass/receive a float to/from a Java app? If so, how did you
manage it?
I need an algorithm for converting an IEEE 754 format float to a 32 bit integer?
I want something that can convert a haskell float into a int that can be stored to
disk for later input to a Java app that converts it back to a float with the Java
floatToIntBits function.
I think I'm OK in the reverse direction, converting an int into a float (as
implemented by the Java intBitsToFloat function). The following link to the Java docs
gives the bit masks and expression required to convert an int to a float.
http://java.sun.com/products/jdk/1.2/docs/api/java/lang/Float.html
Unfortunately, although the page gives a brief description of the the floatToIntBits
function, specfically how to place the components of the floating point number into a
32 bit int, it doesn't describe how to extract those components. Things seem to be
complicated a bit by things such as the hidden bit, and Java interpreting the floating
point to the far left of the mantissa, instead of the far right.
I found the following page describing how the floatToIntBits function works, but I
think it's wrong, since when I try to run this function it gives a different integer
that when I use the standard Java floatToIntBits function. Maybe the page describes a
different version of the IEEE format?
http://www.jos.org/redist/kore-0.0.7/java.lang.Float.src.html
I'm not an expert on any of this - so any algorithm, in any language (including
english), would be much appreciated.
BTW - all of the above applies double (64 bit integer,
doubleToIntBits/intBitsToDouble).
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Global Virtual Desktop
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