Chapter 41 Sub Procedures, Part II Passing by Value Passing by Reference Local Variables Class-Level Variables Debugging.

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Presentation transcript:

Chapter 41 Sub Procedures, Part II Passing by Value Passing by Reference Local Variables Class-Level Variables Debugging

Chapter 42 ByVal and ByRef Parameters in Sub procedure headers are proceeded by ByVal or ByRef ByVal stands for By Value ByRef stands for By Reference

Chapter 43 Passing by Value When a variable argument is passed to a ByVal parameter, just the value of the argument is passed. After the Sub procedure terminates, the variable has its original value.

Chapter 44 Example Dim n As Double = 4 Triple(n) txtBox.Text = CStr(n) End Sub Sub Triple(ByVal num As Double) num = 3 * num End Sub Output: 4

Chapter 45 Same Example: n num Dim num As Double = 4 Triple(num) txtBox.Text = CStr(num) End Sub Sub Triple(ByVal num As Double) num = 3 * num End Sub Output: 4

Chapter 46 Passing by Reference When a variable argument is passed to a ByRef parameter, the parameter is given the same memory location as the argument. After the Sub procedure terminates, the variable has the value of the parameter.