Microsoft Office Tutorials and References
In Depth Information
Lesson 6: Variables, Data Types,
Variables, Data Types,
and Constants
Many of the macros you develop will involve the need for referencing an item you are
working on without specifying that item by its name, amount, or location. This concept may
sound strange at first, but you will quickly discover with your macros that in many situations
it makes sense, and indeed is necessary, to manipulate or analyze data in one part of your
macro, and hold the results in virtual memory for later use.
VBA stores data in memory using a variable . A variable is a name given by you, to which you
assign a piece of data that is stored in an area of the computer’s memory, allowing you to refer
to that data when you need to later in the macro. VBA handles the task of finding an
appropriate place in the computer’s memory to store your variable data, and dutifully retrieves the data
when you ask for it by its variable name.
Variables hold values of different data types (more on this later) that are specified when the
variable is declared. When you declare a variable, you do so by entering a declaration
statement that includes four keywords in a particular order:
The Dim statement (VBA’s abbreviation for “Dimension”), which all variable
declarations start with.
The name of your variable, which you create, such as myValue .
The word As .
The type of data being stored.
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