Library tutorials & articles
Arrays
James first started this website when learning Visual Basic back in 1999 whilst studying his GCSEs. The site grew steadily over the years while being run as a hobby - to a regular monthly audience ...
- Introduction
- Declaring Arrays
- Reading/Writing to Arrays
- Getting the size of the array
- Dynamic Arrays
- Multidimensional Arrays
Reading/Writing to Arrays
You can fill elements of an array very easily. You can use the following syntax:
ArrayName(Element) = Value
Where element is a valid element. The following code declares gArray and fills elements 1,2 and 3 with names.
Dim sArray(1 To 10) As String
sArray(1) = "Paul"
sArray(2) = "Fred"
sArray(3) = "Colin"
Likewise, you can access the value in the array in the same way. The following code displays a message box containing the 3rd value in sArray:
Msgbox sArray(3)
As I said at the start of this tutorial, this can be very beneficial as you can access different values in the array using code. For example, if you hard coded 3 variables:
Dim sName1 As String
Dim sName2 As String
Dim sName3 As String
you would be limited to 3 names, and if you wanted to access them, you would have to write different code for accessing each variable, as you can't type
Msgbox (sName & lNum)
to access sName1, if lNum is 1. With Arrays, you can:
Msgbox sNames(lNum)
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I'm a bit confuse. I would like user to insert how many data they want to put in the array.
When I declare the array like this
Dim subjArr( ) As DataType
How should I write the code so array size is according to user input. This is the code for user to insert how many records should be inserted.
Dim SubArr() As DataType
Dim subjNo As String
subjNo = InputBox("Enter the no of subjects to calculate: ")
MsgBox (subjNo + " subjects will be calculated")
It would work if you used Dim instead of Const. A constant array is not possible in VB and I really don't see the point. Just use a normal array and make sure that it is not modified.
Thanks James
This is a good Array Tutorial for VB Newbies like me.
These guys have a perfect working example. The randomizer isn't truly random but completely adequate for basic purposes. I couldn't get it to work as a function, but it worked great when I simply used to function code in-line, so I know it works.
http://www.4guysfromrolla.com/webtech/110800-1.shtml
I really just added this in case anyone comes across this in a search as I did
+++++++++++++++
check it: FLEETING IMAGE
How do I make a constant array? When I try "const data(1 to 72) as byte" it doesn't work, where it would if I used Dim rather than const. Also, isn't there some way to set a value to the whole thing? Like with one command making data(1) = 4, data(2) = 7 etc.
No, I believe he means something like this:
Say you had a string array with 6 elements, beginning with zero.
The values were arranged like this:
strArray(0) = "Step 1"
strArray(1) = "Step 2"
strArray(2) = "Step 3"
strArray(3) = "Step 4"
strArray(4) = "Step 5"
strArray(5) = "Step 6"
He wants to randomly arrange the elements' contents, like this:
strArray(0) = "Step 4"
strArray(1) = "Step 3"
strArray(2) = "Step 5"
strArray(3) = "Step 1"
strArray(4) = "Step 6"
strArray(5) = "Step 2"
I hope this is correct, and/or clear.
Are you speaking of randomly pulling one of the values as in say a random name generator?
Can anyone tell me if it's possible to randomly sort the elements in an array?
I'm not familiar to 3d arrays, but could you use something similar to:
I use that to copy 1d arrays.
Not the best piece of code but meh.
Does anyone know a way of transferring the content of an array into another array WITHOUT doing this?:
Public Sub MoveArray()
For Z = 0 To 10
Array2(Z) = Array1(Z)
Next Z
End Sub
I am dealing with some very large (3 dimensional) arrays and the above kind of operation seems a little slow for the user to sit around waiting for. (Especially when it will need to be used in the Undo Function)
Any suggestions will be gratefully received.
couling@fsnet.co.uk">pcouling@fsnet.co.uk
This thread is for discussions of Arrays.