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Excel 2013 Power Programming with VBA by John Walkenbach

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Chapter 6: VBA Programming Fundamentals

In This Chapter

• Understanding VBA language elements, including variables, data types, constants, and arrays

• Using VBA built-in functions

• Manipulating objects and collections

• Controlling the execution of your procedures

VBA Language Elements: An Overview

If you've used other programming languages, much of the information in this chapter may sound familiar. However, VBA has a few unique wrinkles, so even experienced programmers may find some new information.

In Chapter 5, I present an overview of objects, properties, and methods, but I don't tell you much about how to manipulate objects so that they do meaningful things. This chapter gently nudges you in that direction by exploring the VBA language elements, which are the keywords and control structures that you use to write VBA routines.

To get the ball rolling, I start by presenting a simple VBA Sub procedure. The following code, which is stored in a VBA module, calculates the sum of the first 100 positive integers. When the code finishes executing, the procedure displays a message with the result.

Sub VBA_Demo()

‘   This is a simple VBA Example

    Dim Total As Long, i As Long

    Total = 0

    For i = 1 To 100

        Total = Total + i

    Next i

    MsgBox Total

End Sub

This procedure uses some common VBA language elements, including:

• A comment (the line that begins with an apostrophe)

• A variable declaration statement (the line that begins with Dim)

• Two variables (Total ...

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