Declaring variables in Visual Basic 2015 and its uses

Declaring variables in Visual Basic 2015 and its uses

Hello Pamela!

Variable is a location or space in the computer’s memory where you can store values temporarily. We can use letters or words to define a variable. To declare a variable please follow the format below.

Dim memory1 as Integer

Explanation: where “memory1” is the variable

“Dim” means “Declare in Memory” in Visual basic. We have to use this to inform the computer that we are establishing a variable or object.

Local variable – can be only used in a local control

How to declare local variable

Private Sub cmdAdd_Click()

Dim sum as integer

End Sub

Private Sub cmdSub_Click()

Dim difference1 as integer

End Sub

Explanation: “sum” is a variable declared only inside cmdAdd_click() and cannot be used by any functions it cannot be used to cmdSub_Click()

Global variable – can be used by multiple controls

Here is the sample declaration.

Option Explicit

Dim A as integer = 3

Private Sub cmdAdd_Click()

Dim sum as integer

sum = A+1

End Sub

Private Sub cmdSub_Click()

Dim difference1 as integer

Difference1=A-1

End Sub

Explanation: above is the illustration of declaring global variable. Where “A” is a global variable that can be used for both command buttons.

Declaring variables is very important to properly addresses a value in computer. Declaring global variables is important to save space, time, and redundancy in declarations. The lesser declaration, the smaller the program, the better output.