1. puzzling code
Hi, All.
While studying Matt Arriola's Crypt.ex code (Recent User Contibutions),
I found a line of code which I'm at a loss to understand.
Simulated code follows;
-- begin code
with trace
sequence bits
object dummy
trace(1)
bits = "11000111001111000011100110101011"
bits -= '0' <--- what's this doing???
dummy = 21 -- has no meaning ... here just for the trace
-- end code
if you run the above which trace on, and watch the display of
variables under the trace window, you'll see how the line
"bits -= '0' transforms the sequence bits. Can somebody explain
what's happening ?
Appreciate any help.
2. Re: puzzling code
> Hi, All.
>
> While studying Matt Arriola's Crypt.ex code (Recent User Contibutions),
> I found a line of code which I'm at a loss to understand.
> Simulated code follows;
>
> -- begin code
>
> with trace
> sequence bits
> object dummy
> trace(1)
>
> bits = "11000111001111000011100110101011"
>
> bits -= '0' <--- what's this doing???
>
> dummy = 21 -- has no meaning ... here just for the trace
> -- end code
>
> if you run the above which trace on, and watch the display of
> variables under the trace window, you'll see how the line
> "bits -= '0' transforms the sequence bits. Can somebody explain
> what's happening ?
>
> Appreciate any help.
it's subtracting the the value of '0'(48) from the `bits` sequence, making
each element the actual numeric value of number that is represented.
In short, it's a quick and crude form of value()
Chris
3. Re: puzzling code
I think joshua added the dummy variable so the value of bits would be
displayed before the trace facily terminated.
is there a reason why you didn't just write..
bits = {1,1,1,0,0,0,0,0,1,1,1,0,etc}
or was that just from joshua's demo code?
Chris
> thanks for showing an interest in my code! ;) i believe chris explained
> the thing with the binary code, but i forgot what that dummy object was
> for...probably just a relic. in fact, i don't remember even putting it
> in there!
>
> joshua goldberg wrote:
> > Hi, All.
> >
> > While studying Matt Arriola's Crypt.ex code (Recent User Contibutions),
> > I found a line of code which I'm at a loss to understand.
> > Simulated code follows;
> >
>
> *snip*
>
>
>
>
>
>
