1. Binary conversion
Okay, I asked this a while back and now I've got a slightly different
problem.
If I have a sequence of {0,0,0,2} that is supposed to represent a binary
number, how do I convert that to an atom?
Jonas
2. Re: Binary conversion
Not sure what you mean by "binary". I normally regard binary numbers as only
having ones and zeros. Thus {0,0,0,2} doesn't fit my idea of a binary number
'cos it has a '2' in it.
Or does this sequence represent a 4-byte number, with each element having
the range 0-255?
In that last case the atom could be ((((s[1] *
256)+s[2])*256)+s[3])*256)+s[4]
----------------
cheers,
Derek
----- Original Message -----
From: "Jonas Temple" <jktemple at yhti.net>
To: "EUforum" <EUforum at topica.com>
Sent: Friday, August 16, 2002 7:46 AM
Subject: Binary conversion
>
> Okay, I asked this a while back and now I've got a slightly different
> problem.
>
> If I have a sequence of {0,0,0,2} that is supposed to represent a binary
> number, how do I convert that to an atom?
>
> Jonas
>
>
>
>
3. Re: Binary conversion
Jonas
If peek({m,4}) returns {0,0,0,90} and you want that to represent the value
90, then do this:
sequence s
atom a
s = peek({m,4})
a = s[4] + s[3] * 256 + s[2] * 65536 + s[1]*16777216
-----------
cheers,
Derek
----- Original Message -----
From: "Jonas Temple" <jktemple at yhti.net>
To: "EUforum" <EUforum at topica.com>
Sent: Friday, August 16, 2002 10:54 AM
Subject: RE: Binary conversion
>
> I really wrote the last post in a moment of frustration.
>
> What I didn't quite have a grasp on is the fact that if you do a poke4
> of an atom with a value of 90 to memory and then do a peek({mem,4}) at
> the same location you get {90,0,0,0}. The PC expert would say, "Well,
> duh, a PC stores binary numbers with significant digit first!" (or
> last...no first...oh, whatever). What I've been working on is wrappers
> for DLLs that interface to an IBM iSeries. IBM's method is to store
> significant digits last so your 90 would look like {0,0,0,90}. I tried
> doing a value() against my {0,0,0,90} which returned nothing (as it
> should).
>
> So that's why I wondered about binary conversion. Still wondering on
> how to turn {0,0,0,90} back into 90. I'm gonna keep diggin'.
>
> Jonas
>
>
>
>
