converting from bit->byte->char->byte

Re: converting from bit->byte->char->byte

Hi,

As I understand it, A byte goes from -128 to 128. A char goes from 0 to 255.
So, to convert from byte to a char correctly, you could do this:

byte b = -128;
char c = (char)b;
System.out.prin tln(c);
char c2 = (char)(b + 128);
System.out.prin tln(c2);
byte b2 = (byte)(c2 -128);

Clunky, but works.
Depends on what you want to use it for, you may want to try using a reader
or a stream..

Steve

"Nicholas Parnell" <nicholas.parne [email protected]> wrote in message
news:1077127489 [email protected] et.dnd.ca...[color=blue]
> Hi! I have the problem where I cast a bit string of "10000000" to a
> byte, which i get -128; this is fine so far. However, when I take this[/color]
byte[color=blue]
> and cast it to a char, I get a question mark('?'). So when i go to cast[/color]
it[color=blue]
> back to a byte, i now get 63 (the ascii representation of a question[/color]
mark).[color=blue]
> I see that for any byte from 128 to 256 i'll get a question mark... must[/color]
be[color=blue]
> java's way of indicating that's it's negative or something.... my
> question to you all is:
>
> 1) Why is it doing this?
>
> 2) What can I do so that I can cast -128 to char and back to a byte to
> get -128 again?
>
> Thanks!
>
>[/color]

Re: converting from bit-&gt;byte-&gt;char-&gt;byte

A better way to make a char from a byte would be:

byte b = -128;
//To Char
char c = (char)(b & 0xFF);
//To Byte
byte b2 = (byte)(c & 0xFF);




"Nicholas Parnell" <nicholas.parne [email protected]> wrote in message
news:1077127489 [email protected] et.dnd.ca...[color=blue]
> Hi! I have the problem where I cast a bit string of "10000000" to a
> byte, which i get -128; this is fine so far. However, when I take this[/color]
byte[color=blue]
> and cast it to a char, I get a question mark('?'). So when i go to cast[/color]
it[color=blue]
> back to a byte, i now get 63 (the ascii representation of a question[/color]
mark).[color=blue]
> I see that for any byte from 128 to 256 i'll get a question mark... must[/color]
be[color=blue]
> java's way of indicating that's it's negative or something.... my
> question to you all is:
>
> 1) Why is it doing this?
>
> 2) What can I do so that I can cast -128 to char and back to a byte to
> get -128 again?
>
> Thanks!
>
>[/color]