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Author Topic: 256=0? - Whyy!?!  (Read 677 times) Bookmark and Share
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geekygenius
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« on: 04 May, 2012, 04:31:43 »
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So, I was wondering if there was a way to get a 16-bit variable A to return false when A=256 for A=0. Essentially, how do I force a 16 bit comparison?
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« Reply #1 on: 04 May, 2012, 04:34:44 »
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The equals operator in Axe is a 16-bit comparison. Perhaps A is being set improperly?
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« Reply #2 on: 04 May, 2012, 04:46:18 »
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A is being set through a pointer, and it can be set over 256 and get something over 256. Maybe I forgot the little r thingy that goes after the variable to make it 16 bit...
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« Reply #3 on: 04 May, 2012, 04:48:10 »
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Can you post an example? Yeah that might be the r thing indeed.
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« Reply #4 on: 04 May, 2012, 05:50:44 »
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I think he meant an 8-bit comparison, not a 16 bit comparison...
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« Reply #5 on: 04 May, 2012, 06:05:14 »
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Quote from: ZippyDee on 04 May, 2012, 05:50:44
I think he meant an 8-bit comparison, not a 16 bit comparison...
He said he wanted it "to return false when A=256 for A=0," which would be sixteen bits (which it already is).

Since you're setting it as a pointer, here's something to keep in mind, if you're not aware of it already: Numbers are stored in little-endian format, which means the first byte is the low byte (the the number modulo 256), and the byte after it is the high byte (the number divided by 256).

So if you're doing something like 1→{°A+1} when A was originally zero, A would now equal 256.

Not sure if that's your problem, but I hope that helps.
« Last Edit: 04 May, 2012, 06:05:32 by Deep Thought » Logged



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« Reply #6 on: 04 May, 2012, 07:15:07 »
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Basically he wants to only compare the LSB, as far as I can tell.
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« Reply #7 on: 04 May, 2012, 07:33:14 »
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Quote from: Deep Thought on 04 May, 2012, 06:05:14
Quote from: ZippyDee on 04 May, 2012, 05:50:44
I think he meant an 8-bit comparison, not a 16 bit comparison...
He said he wanted it "to return false when A=256 for A=0," which would be sixteen bits (which it already is).

Since you're setting it as a pointer, here's something to keep in mind, if you're not aware of it already: Numbers are stored in little-endian format, which means the first byte is the low byte (the the number modulo 256), and the byte after it is the high byte (the number divided by 256).

So if you're doing something like 1→{°A+1} when A was originally zero, A would now equal 256.

Not sure if that's your problem, but I hope that helps.
Big frown I don't get why we can't just have the bytes go in a logical order. Thanks though, I'll look at my program with this knowledge. I can just bit-wise and both bits together if I need to. I will also post my final code when I get done, for anyone else with the same question.
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« Reply #8 on: 04 May, 2012, 08:08:20 »
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It's up to the CPU, the z80 only handles little-endian. Both storage models (little-endian, big-endian) make sense at different parts of the processes of reading/writing/storing
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« Reply #9 on: 04 May, 2012, 17:47:25 »
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Quote from: geekygenius on 04 May, 2012, 07:33:14
Big frown I don't get why we can't just have the bytes go in a logical order.
Because if you have a pointer to a 16-bits value that is under 255, you can use the same pointer and get the same value with only 8-bits (dunno if I explained well Tongue)
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« Reply #10 on: 05 May, 2012, 00:32:07 »
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So, it turns out I forgot to do the {P}^r thingy. It works now! Cheesy Thanks guys!
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« Reply #11 on: 05 May, 2012, 00:34:56 »
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Hmm you posted 3 times in a row Huh?
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« Reply #12 on: 08 May, 2012, 12:05:43 »
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I actually don't even get what "to return false when A=256 for A=0" means O.o explain please?
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« Reply #13 on: 08 May, 2012, 12:06:55 »
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Quote from: aeTIos on 08 May, 2012, 12:05:43
I actually don't even get what "to return false when A=256 for A=0" means O.o explain please?

He wants to check if the least significant byte is all zero.
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« Reply #14 on: 08 May, 2012, 12:08:18 »
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ah. thanks for explaining.
(so if I get it right he wants to check if the hex number is 00xx)?
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[







Spoiler for Still Alive:
This was a triumph.
I'm making a note here: HUGE SUCCESS.
It's hard to overstate my satisfaction.

Aperture Science:
We do what we must because we can.
For the good of all of us
Except the ones who are dead.

But there's no sense crying over every mistake
You just keep on trying till you run out of cake
And the science gets done and you make a neat gun
For the people who are still alive.

I'm not even angry.
I'm being so sincere right now.
Even though you broke my heart and killed me.
And tore me to pieces.
And threw every piece into a fire.
As they burned it hurt because
I was so happy for you.

Now these points of data make a beautiful line
And we're out of beta we're releasing on time.
So I'm GLaD I got burned think of all the things we learned
For the people who are still alive.

Go ahead and leave me.
I think I prefer to stay inside.
Maybe you'll find someone else to help you.
Maybe Black Mesa -
THAT WAS A JOKE. HA HA, FAT CHANCE.
Anyway, this cake is great:
It's so delicious and moist.

Look at me still talking when there's science to do.
When I look out there it makes me GLaD I'm not you.
I've experiments to run there is research to be done
On the people who are still alive

And believe me I am still alive.
I'm doing science and I'm still alive.
I feel FANTASTIC and I'm still alive.
While you're dying I'll be still alive.
And when you're dead I will be still alive.

Still alive
Still alive
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