Array size question in AGK - GameCreators Forum

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Jeku

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Posted: 7th Nov 2015 19:25 Edited at: 7th Nov 2015 19:27

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Here's code from the official AppGameKit 2 arrays documentation.

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myArray as integer[5] = [3,4,1,5,2,6]
myArray.sort() // array is now [1,2,3,4,5,6]
index = myArray.find(4) // will return "3" as array indexes start at 0

If I declare an array in a C-scripted language like PHP with a size of 5, then I can ONLY put 5 elements into that array. Yes, the first index is 0, so the last index would be 4. But no matter how you look at it, there can ONLY be 5 elements in that array (0, 1, 2, 3, 4). In a BASIC language like AppGameKit, it is the same, but with an index starting with 1 (1, 2, 3, 4, 5).

Question: is this showing that AppGameKit is flexible enough to allow the programmer to add extra elements to an array, or is there an error in documentation? I've never seen a language where you declare the size of an array, and it gives you a size + 1.

EDIT:

Also, is there a way to do a 2D or 3D array? Can't seem to find that in the docs.

Senior Software Engineer - RotoGrinders

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Markus

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Posted: 7th Nov 2015 19:41 Edited at: 7th Nov 2015 19:42

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in basic its normal, u define the upper limit that includes the 0 index.
normal access
for index=1 to count

it have commands to add/insert data so it should not expand automatic.

at this page u can see a multi dimension array.
http://www.appgamekit.com/documentation/guides/12_array_changes.htm

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Paul Johnston

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Posted: 7th Nov 2015 20:01

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If I could choose I would remove the 0 element and have it go from 1 to index, but it is a part of the language now so we must continue to support it. I did consider writing the documentation as if the 0 element didn't exist and pretend it goes from 1 to index, but then when someone discovers the 0 element they are going to be confused, so I did my best to explain it in there.

A 2D array can be created like so

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myArray as integer[5,5]

AppGameKit supports up to 6 dimensions.

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Fluorescent

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Posted: 7th Nov 2015 22:03

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Paul Johnston wrote: "If I could choose I would remove the 0 element and have it go from 1 to index, but it is a part of the language now so we must continue to support it."

You could create something like a preprocessor directive so the developer can choose 0 or 1 as starting point for arrays. Like so

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#Array_start_0

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Jeku

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Posted: 8th Nov 2015 19:18

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Quote: "in basic its normal, u define the upper limit that includes the 0 index.
normal access
for index=1 to count"

Normally in BASIC, you define the upper limit and it doesn't include 0, as Paul Johnston stated. At least I know now how to think about arrays in AGK. I've been using them already all over my project but didn't use the 0 index, so it's probably just fine