Ionsworld InfoTech Consult

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DATA DECLARATION

Before any data is used in programming as a storage medium, it must have its data type declared. This ensures that it continually stores and remits only that consistent data type to enable the program run optimally.

For example, if you have two buckets, one for storing and retrieving water for use and the other for storing kerosene, should the one for water is then added kerosene it ruins the content in that bucket and vice versa.

The data type is like the bucket that stores specified and uniform data. Once declared, it can conveniently handle that data within the limits of the declaration.

In visual Basic 2008 and upward, Dim is used as the data declaration code syntax

Data can be declared as:
1. numeric data types: eg Byte, Integer, Long, Single, Double, Currency, Decimal

2. non-numeric data types: eg String, Date, Boolean, Object, Variant (numeric or text)

Rules for declaring data:
1. Data must be less than 255 characters.
2. No spacing is allowed in data declaration.
3. Data type It must not begin with a number.
4. Period and some specific symbols (please find them out) are not permitted.

eg. My_bae and not My.bae, Thisboo not 2Thisboo, his_her_bucket not his&herbucket.

Therefore, declare data as Dim "Variable Name" As "Data Type"

ie. Dim password As String
Dim name As String
Dim counter As Integer
Dim average As Decimal
Dim askDate As Date

Assignment:
1. write a list of data names and the possible declaration type.
2. Elaborate the various data types and the range of data they can hold.

Try this:
Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.Show()
Dim val As String
val = "my first code"
RichTextBox1.Text = val
If val = "" Then
Label1.Text = "welcome to visual basic tutorial with ionsworld infotech consult"
Else
Label1.Text = "welcome to visual basic tutorial with ionsworld infotech consult here is what you have typed: " + val

RichTextBox1.Hide()
End If

End Sub

End Class

Assignment: Run the code and try to alter the richtext box from the form dynamically.

project!!! https://youtu.be/ARbLvbBTIJ4

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