On Mon, 2008-10-06 at 21:18 +0800, loody wrote:
> Dear all:
> I have to compare 2 values which is represented by 2 bytes as 0xffff
> and 0x00fe in 2's complement system.
> so the difference between them should be -1 - 254 =-255.
> but before do such calculation, I have to translate 0xffff as -1.
> Is there build-in function in perl for me to use, or should I transfer
> it by hand?
> below is the method I thought, but it really seems lousy.
>
> my $tmp_value1="ffee";
> if (hex $tmp_value1 & 0x8000)
> {
> my $int=int $tmp_value1;
> $int -= 2**16;
> $tmp_value1=$int;
> }
> appreciate your help,
> miloody
>
See `perldoc -f unpack`.
--
Just my 0.00000002 million dollars worth,
Shawn
Linux is obsolete.
-- Andrew Tanenbaum
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