Mastering 'As Double' in VBA: A Comprehensive Tutorial for Beginners

Visual Basic for Applications (VBA) is a programming language incorporated in Excel that can automate tasks and extend Excel's capabilities. Today, we're focusing on the VBA data type 'As Double' and how it can be utilized in your code.

The Role of 'As Double'

In VBA, 'Double' is a data type that holds very large or small numbers and precise decimal values. When you declare a variable 'As Double', you allow it to store values from -1.79769313486231570E+308 to -4.94065645841246544E-324 for negative values, 4.94065645841246544E-324 to 1.79769313486231570E+308 for positive values.

Implementing 'As Double' in VBA

Let's learn how to use 'As Double' in VBA:

1. Launch Excel and press Alt + F11 to navigate to the VBA Editor.

2. Inside the VBA Editor, click on Insert > Module to start a new module.

3. Declare a variable 'As Double' and use it in your code as follows:

Sub CalculateArea()
    Dim radius As Double
    Dim area As Double

    radius = 7.85
    area = 3.1415 * radius ^ 2

    MsgBox "The area of the circle is " & area
End Sub

This code declares radius and area as Double, calculates the area of a circle with the given radius, and then displays the result in a message box.

4. Close the VBA Editor. The CalculateArea macro can now be run from your Excel workbook.

Understanding and using the 'As Double' data type is vital when you're dealing with numbers that require high precision or fall in the extremely large or small range in VBA.

For additional insights on VBA data types, check out this link.

Summary: This tutorial introduces the VBA data type 'As Double' and its usage in your code. Understanding this will allow you to work with high precision numbers or extremely large or small numbers in VBA.