Aliasing

Newzed

I have a variable - "sertext var byte(12)".

This variable is used once at the beginning of the program cycle, and changes each time the program cycles.

I have tried aliasing like this:

a· var· sertext(0)
b· var sertext(1)

but the program will not accept it.· Is there any way to alias the bytes in sertext - I need more variables but RAM is full.· I am using a BS2P24 at the present time.

Sid

Jon Williams

The compiler doesn't let you alias an indexed element of an array.· There is a way around it -- it just requires a bit of typing:

Instead of...

myText····· VAR···· Byte(3)

Do this:

myText······VAR···· Byte
myText1··· ·VAR···· Byte
myText2···· VAR···· Byte

You can still treat "myText" as an array of three elements, and now the compiler will let you alias the individual entities:

header···· ·VAR···· myText
cmd········ VAR··· ·myText1
dByte······ VAR···· myText2

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

Newzed

Thanks, Jon.· I'll give that a shot.· To save typing·can I write:

a· var byte(12)

a· var byte
a1 var byte
a2 var byte

and so on.

Sid

Tom Walker

Not quite.

As Jon stated: "You can still treat "myText" as an array of three elements, " so the concept can be expressed as:

myText VAR Byte
myText1 VAR Byte
myText2 VAR Byte

and you can address

myText(0) which will equal myText
myText(1) which will equal myText1
myText(2) which will equal myText2

Or am I missing the boat, Jon?

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Jon Williams

You're on the boat, Tom. In actualy fact, PBASIC treats the variable RAM space as an implicit array which can come in handy if you know how to handle it. What is critical about defining arrays manually (so you can alias elements) is that you MUST define the elements in order.

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

Bean

I think Sid is thinking of the SX/B aliasing. SX/B does allow what he had originally posted.
Bean.

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