Understanding variable scope
In VB, variable scope refers to where a variable can be accessed within a program. Variables can be declared at different levels of scope, and their visibility and accessibility can depend on where they are declared.
There are three levels of variable scope in VB:
- Procedure-level scope: Variables declared within a procedure or function are only accessible within that procedure or function. Once the procedure or function has been completed, the variables are destroyed, and their values are lost. Here’s an example:
Sub mySub() Dim myInteger As Integer myInteger = 45 End Sub
In this example, the
myIntegervariable is declared within themySubprocedure. Therefore, it can only be accessed within that procedure and is destroyed when completed. - Module-level scope: Variables declared outside any procedure or function are accessible throughout the entire module. They can be used in any procedure or function within the...