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1) Should I prefix my variables with a data type indicator ?
Yes. All variables should be prefixed with an abbreviation that indicates their data type.
In VBA, type conversions can be implicit, so this reduces errors and improves readability.
For a list of all the prefixes, please refer to the Data Types page.
Dim sMyString As String
Dim lMyNumber As Long
2) When declaring variables should I use Private ?
For global level variables use "Public"
For module level variables use "Private"
For local level variables use "Dim"
Public sText As String
Private sText As String
Dim sText As String
3) What is a Variable Declaration Character ?
When you use the Variant data type the compiler is able to determine the correct data type for a numerical literal.
However there might be times when the default data type is different to the desired one.
It is possible to append a special character to the end of a literal constant to make it explicit.
Dim myVariant1 As Variant
Dim myVariant2 As Variant
myVariant1 = 100
myVariant2 = 100#
Debug.Print VBA.TypeName(myVariant1) 'Integer
Debug.Print VBA.TypeName(myVariant2) 'Double
4) What is a Static Variable ?
A static variable is a local variable whose value will be preserved within the subroutine or function.
A static variable has the scope of a local variable but the lifetime of a module level variable.
A static variable is only visible in the subroutine or function where it is declared.
You should always initialise a static variable before using it.
Public Sub MySubroutine()
Static iStatic As Integer
5) How is a Static Variable different to a Module Level Variable ?
A static variable will preserve its value but will not be visible outside the subroutine or function.
A module level variable will preserve its value and will be visible to all the other subroutines and functions in that module.
Public sOutside1 As String
Private sOutside2 As String
Public Function MyFunction() As Integer
Static iStatic As Integer
6) Can you explain the difference between the Stack and the Heap ?
The stack contains value data types on a first in, first out basis.
The stack stores items on a last in first out basis
The stack is where local variables are stored.
The heap contains reference data types.
The heap is where global variables are stored
7) What is the difference between Early Binding and Late Binding ?
Early binding allows for compile-time checking and requires you to explicitly declare the data type of the object.
Late binding relies on run-time checking and uses the generic Object data type.
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