Author Topic: String and variable questions  (Read 4356 times)

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Offline alberthrocks

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String and variable questions
« on: November 11, 2010, 12:44:41 am »
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I'm making a viral video for a club at my school, and guess what? A calc, and a compiled Axe program will be involved! :D
It'll be a very quick and dirty browser GUI simulation. (Real internet via tethered link/USB will be coming soon via C2I though! :))
I'll post the final program when it's done, as well as a snip of the viral video.
However, I've encountered some problems while writing it.

I have 2 questions - first, I can't seem to change the text in the variable.
I tried this:
Code: [Select]
"text"->Str0
...
"different text"->Str0
It always errors with "ERR: DUPLICATE". After looking back at the manual, it seemed that Str* and some other variables
were static, which meant that you can't change them. However, other variables could be changed.

So, I switched to this:
Code: [Select]
"text"->R
...
"different text"->R
...and then this time, I get another error: "ERR: BAD SYMBOL", and the error scrolls to the first def. line.
Looks like I can't put anything into any variable, eh? :P (Or I might have read the manual wrong)
How can I change the text at any time in a variable? Please provide a simple code example.

My second question: is there any way to print text to the back buffer directly without altering the screen or the 1st buffer?
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Offline alberthrocks

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Re: String and variable questions
« Reply #1 on: November 11, 2010, 11:09:43 am »
Quick post bump, since this was posted at midnight. :)

Any solutions? :D
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Offline Munchor

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Re: String and variable questions
« Reply #2 on: November 11, 2010, 11:22:15 am »
I'm also getting DUPLICATE erros, ALL PROGRAMMING LANGUAGES ALLOW CHANGING VARIABLES but Axe :'(

Maybe DelVar?

I don't know, I get the same error :'(

Offline Michael_Lee

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Re: String and variable questions
« Reply #3 on: November 11, 2010, 01:04:22 pm »
Well, for the second question, if what's displayed on the screen is identical to the buffer, you could use
Code: [Select]
Fix 5
RecallPic          //back-buffer to buffer
Text Commands here
StorePic           //buffer to back-buffer
StoreGDB           //screen to buffer
« Last Edit: November 11, 2010, 01:04:56 pm by Michael_Lee »
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Offline Builderboy

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Re: String and variable questions
« Reply #4 on: November 11, 2010, 02:06:15 pm »
You cannot chance Strings or data once you have initialized them unfortunately.  This is not supported in Axe.  A way to get around that would be this:

"0123"->Str1  //Takes up 5 bytes
Zeros(20)      //Add on an extra 20 bytes of empty data just in case the string gets bigger

Then to change it:

Copy("12345",Str1,6)  //Copy new data into the same spot, the length is 6 including the terminating character

Offline Deep Toaster

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Re: String and variable questions
« Reply #5 on: November 11, 2010, 04:30:06 pm »
I'm also getting DUPLICATE erros, ALL PROGRAMMING LANGUAGES ALLOW CHANGING VARIABLES but Axe :'(

Maybe DelVar?

I don't know, I get the same error :'(

They're not really variables. They're just data inside the program that's "named" Str1. And so the problem with replacing it would be that anything longer would overwrite what came after the original data (that's why Builderboy's code has the Zeroes( thing).




Offline Munchor

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Re: String and variable questions
« Reply #6 on: November 11, 2010, 04:34:25 pm »
I'm also getting DUPLICATE erros, ALL PROGRAMMING LANGUAGES ALLOW CHANGING VARIABLES but Axe :'(

Maybe DelVar?

I don't know, I get the same error :'(

They're not really variables. They're just data inside the program that's "named" Str1. And so the problem with replacing it would be that anything longer would overwrite what came after the original data (that's why Builderboy's code has the Zeroes( thing).

Yeah, I found out how to work it through already :) thanks

Offline jnesselr

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Re: String and variable questions
« Reply #7 on: November 11, 2010, 10:40:18 pm »
C2I soon?  I'm still working on usb... But, brandonw really helped me on hwcp last night. ;-)

Offline ztrumpet

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Re: String and variable questions
« Reply #8 on: November 11, 2010, 11:44:43 pm »
You could always do this:
Code: [Select]
"text"->Str0
...
"different text"->Str1
...
If something
Str0->A
Else
Str1->A
End
...
Text(X,Y,A)

Offline calcdude84se

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Re: String and variable questions
« Reply #9 on: November 14, 2010, 10:28:33 am »
Use a variable pointer to point to the data...
I'm not sure I would have thought of that O_o
That should work, ztrumpet! :)
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