-----------------------------------

[Gandalf]

Mon Jun 20, 2005 4:21 pm


2D Arrays, or Something?

-----------------------------------

I'm just a bit confusled right now, having an exam and the sort tomorrow.  
Let's say I had this:
var bullet : flexible array 1 .. 0 of
    record
        x, y
    end record
How would I add a say, bullet(2) so that I don't have to copy the whole thing and rename the new bullet to bullet2.  So pretty much what I'm asking is, how would I shorten something like this:
var bullet : flexible array 1 .. 0 of
    record
        x, y : real
    end record

var bullet2 : flexible array 1 .. 0 of
    record
        x, y : real
    end record
Thanks.


-----------------------------------

Bacchus

Mon Jun 20, 2005 4:39 pm



-----------------------------------

Ok, now I'm a bit confusled about what you mean. Do you mean like a shorter way of making another array with the same record?
type positions :
    record
        x, y : real
    end record
var bullet : flexible array 1 .. 0 of positions
var bullet2 : flexible array 1 .. 0 of positions Or do you mean adding another bullet to your array?
var bullet : flexible array 1 .. 0 of
    record
        x, y : real
    end record
new bullet, 2 Or do you mean like adding another dimension to the flexible array? Please explain a bit more.


-----------------------------------

lyam_kaskade

Mon Jun 20, 2005 4:40 pm



-----------------------------------


type foo :
    record
        x, y : int
    end record

var bullet : flexible array 1 .. 0 of foo
var bullet2 : flexible array 1 .. 0 of foo
[/code]


-----------------------------------

Cervantes

Mon Jun 20, 2005 4:41 pm



-----------------------------------

Well, you can make it into a type and then create different variables:

type obj :
     record
         x, y, : real
     end record
var bullet : flexible array 1 .. 0 of obj
var bullet2 : flexible array 1 .. 0 of obj

But if you've got a flexible array of bullets, why are you making bullet and bullet2?  In any case, if you must do that, you could try a 2D array.

type obj :
    record
        x, y : real
    end record
var bullet : flexible array 1 .. 0, 1 .. 0 of obj

EDIT: 2 posts got there before me.  Yee-gawds!


-----------------------------------

[Gandalf]

Mon Jun 20, 2005 5:05 pm



-----------------------------------

Ya, thanks - I was forgetting about types  :doh: 

But if you've got a flexible array of bullets, why are you making bullet and bullet2?
Well, they're not two different bullets, they're two kinds of bullets going in different directions.


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MysticVegeta

Mon Jun 20, 2005 6:35 pm



-----------------------------------

doh! there can be a flexible array with mutiple dimension, jeez and all this time i have been sleeping  :shocked:


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Cervantes

Mon Jun 20, 2005 6:53 pm



-----------------------------------

I was pressured into adding that to the tutorial.  Check it out :)


-----------------------------------

Bacchus

Mon Jun 20, 2005 9:38 pm



-----------------------------------

Even though in your Tutorial Cervantes, you list some basic rules... Like In a 2D array, if you leave one upper bounds alone, you can do whatever you want to the other bounds. That doesn't work :( Try it out:
var foo:flexible array 1..3,1..2 of int
new foo,3,3 There is a bit of a way around this, takes up a bit of space thought. Just create a new array (doesn't have to be flexible) and store the orginal array in that then change the dimension to 0 and back to what you want before restoring the original array's values. lol


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Cervantes

Tue Jun 21, 2005 9:56 am



-----------------------------------

Ooh, thanks for that, Bacchus.  It's updated. :)


-----------------------------------

MysticVegeta

Tue Jun 21, 2005 11:05 am



-----------------------------------

Just create a new array (doesn't have to be flexible) and store the orginal array in that then change the dimension to 0 and back to what you want before restoring the original array's values. lol

i see i see, pretty nifty.I think the reason they cant make it 3, 3 is because turing doesnt know the flexiblility of the elements of each of the dimensions of the flexible array.


-----------------------------------

Cervantes

Tue Jun 21, 2005 1:07 pm



-----------------------------------

Bah!  This is not so pretty!

var list : flexible array 1 .. 3, 1 .. 2 of int
for i : 1 .. upper (list, 1)
    for j : 1 .. upper (list, 2)
        list (i, j) := i * j
    end for
end for

var tempArr : array 1 .. upper (list, 1), 1 .. 4 of int
for i : 1 .. upper (tempArr, 1)
    for j : 1 .. upper (tempArr, 2)
        if i