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Sub Procedures, Part II (Continue)

Sub Procedures, Part II (Continue). Local Variable. A variable declared inside a Sub procedure with a Dim statement Space reserved in memory for that variable until the End Sub – then the variable ceases to exist. Local Variables. Private Sub btnOne_Click(...) Handles btnOne_Click

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Sub Procedures, Part II (Continue)

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  1. Sub Procedures, Part II (Continue) Chapter 4

  2. Local Variable • A variable declared inside a Sub procedure with a Dim statement • Space reserved in memory for that variable until the End Sub – then the variable ceases to exist Chapter 4

  3. Local Variables Private Sub btnOne_Click(...) Handles btnOne_Click Dim num As Integer = 4 SetFive() txtBox.Text = CStr(num) End Sub Sub SetFive() Dim num As Integer = 5 End Sub Output: 4 Chapter 4

  4. Class-Level Variables • Visible to every procedure in a form’s code without being passed • Dim statements for class-level variables are placed • Outside all procedures • At the top of the program region Chapter 4

  5. Class-Level Variables Dim num As Integer = 4 Private Sub btnOne_Click(...) Handles btnOne_Click txtBox.Text = CStr(num) SetFive() txtBox.Text = CStr(num) End Sub Sub SetFive() num = 5 End Sub Output: 5 Chapter 4

  6. Scope • The scope of a variable is the portion of the program that can refer to it. Chapter 4

  7. Scope • Class-level variables have class-level scope and are available to all procedures in the class. • Variables declared inside a procedure have local scope and are only available to the procedure in which they are declared. Chapter 4

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