Sorry I did not make myself clear - I thought it was obvious given the
previous postings on this subject.
This java program:
public class TestByte {
public static void main(String[] args)
{
int i = 0x123456ab;
byte[] b = new byte[1];
b[0] = (byte) i;
showInt("i",i);
showByte("b[0]",b[0]);
}
private static void showInt(String s, int x)
{
System.out.println(String.format("%s=%d(0x%08x 0x%02x)", s, x,
x,
x));
}
private static void showByte(String s, byte x)
{
System.out.println(String.format("%s=%d(0x%08x 0x%02x)", s, x,
x,
x));
}
}
compiles and runs, producing this output:
i=305419947(0x123456ab 0x123456ab)
b[0]=-85(0x000000ab 0xab)
But, this bit of clojure:
(defn show [s x] (println (format "%s=%d(0x%08x 0x%02x)" s, x, x, x)))
(def i 0x123456ab)
(def b (byte-array 1))
(aset-byte b 0 (byte i))
(show "i" i)
(show "b[0]" (aget b 0))
throws this exception:
java.lang.IllegalArgumentException: Value out of range for byte:
305419947
Shouldn't these two programs be equivalent?
Presumably they are not because the effect of
int i = (byte) b;
is NOT the same as
(def i (byte b))
-- but surely it should be the same?
On Feb 11, 5:24 pm, Andy Fingerhut <andy.finger...@gmail.com> wrote:
> What can you not do with the signed byte type and arrays of bytes
> (Java byte[] and Clojure (byte-array ...))?
>
> I believe these are frequently used for Java I/O, and can be used for
> Clojure I/O as well.
>
> Andy
>
> On Feb 11, 2011, at 9:22 AM, timc wrote:
>
> > How on earth is one supposed to do communication programming (not to
> > mention handling binary files etc) without an unsigned byte type?
>
> > I see that this issue has been talked about vaguely - is there a
> > solution?
>
> > Thanks
>
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