Re: [Pgubook-readers] Type .long

[George Nyoro]

Well, yes, 255 is the maximum per byte, but a long is supposed to span 4 bytes (or 8 on some 64 bit architectures).

On 11 January 2014 13:40, Roger <address@hidden> wrote:

> On Sat, Jan 11, 2014 at 10:48:19AM +0300, George Nyoro wrote:
...snip...

>   At the offending line, if I replace it with je end, the program works. If
>   I leave it as is, the exit status is 0, showing that the program did not
>   run even once. The reason I came to understand or diagnose is that the
>   value of eol is some value greater than 255 while %edi is, for the start
>   of the program after moving the address to it, less than 255. eol is then
>   seen as smaller than edi by the value that it overshoots 255 by hence the
>   program never runs� through the rest of loop.
>
>   Now, my problem is, why? The only part in the book that referenced
>   anything like this said that only the exit status is allowed to be less
>   than 256. But why do longs overshoot? How then can I ever compute large
>   numbers? Unless something is wrong with my code.
>
>   Please help, Much appreciated.

Interesting you noted the numeral 255, as some platforms have a limit of
255/256 for hardware addresses/addressing.

"255 (number)"
http://en.wikipedia.org/wiki/255_(number)

I remember this from my Commodore 64 days.
PEEK
http://www.c64-wiki.com/index.php/PEEK


--
Roger
http://rogerx.freeshell.org/


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