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VBA CDbl function is used to convert a value into a double-precision floating-point number. This allows for more precise calculations and is especially useful when dealing with large or small numbers. In this blog post, we will explore the syntax, arguments, examples, remarks, and important notes for using the CDbl function in VBA.

## VBA CDbl Function – Purpose, Syntax and Arguments

### Syntax:

The syntax for the CDbl function is as follows:

CDbl(Value)

Where ‘Value’ is the value that you want to convert into a double-precision floating-point number.

### Arguments:

• Value: This is the value that you want to convert into a double-precision floating-point number. It can be any numerical value, string, or expression.

### Example:

Let’s say we have a VBA module with the following code:

Sub Example()
Dim num as String
num = "10.5"
MsgBox "The converted value is " & CDbl(num)
End Sub

When we run this code, the message box will display the value “The converted value is 10.5” This is because the CDbl function has converted the string “10.5” into a double-precision floating-point number.

### Remarks:

– The CDbl function can also be used to convert a currency value into a double-precision floating-point number.
– If the string or expression cannot be converted into a number, the CDbl function will return an error.
– If the string or expression contains special characters or letters, the CDbl function will only convert the numerical portion of the value.

### Important Notes:

– The CDbl function cannot be used to convert a Boolean value into a double-precision floating-point number. For this, the ‘CBool’ function should be used.
– The CDbl function will always return a value in the standard numeric format, using a period (.) as the decimal separator.
In conclusion, the CDbl function is a useful tool in VBA for converting values into double-precision floating-point numbers. It allows for more accurate calculations and can be easily incorporated into your code. However, it is important to note the limitations and use the appropriate function for converting different data types.

## Understanding VBA CDbl Function with Examples

### What is the CDbl Function in VBA?

VBA (Visual Basic for Applications) is a programming language built into Microsoft Office applications, such as Excel and Word. It is used to automate tasks and create custom solutions within these applications. VBA includes a wide range of functions that can be used to manipulate data, perform calculations, and more.
One powerful function in VBA is the CDbl function. CDbl stands for “convert to double”, and as the name suggests, it is used to convert values to the Double data type. In this blog post, we will explore the CDbl function in detail, including its syntax, common uses, and a few examples to demonstrate its capabilities.

### Syntax:

The syntax for the CDbl function is as follows:

CDbl(expression)

The “expression” in the syntax refers to any valid VBA expression that you want to convert to the Double data type. It can be a variable, a constant, or a string containing a numeric value.

### Converting a Numeric Value to Double

Let’s start with a simple example to understand how the CDbl function works. Suppose we have a numeric value stored in a variable called “myNumber” and we want to convert it to the Double data type.

Dim myNumber As Integer
myNumber = 10
Dim myDouble As Double
myDouble = CDbl(myNumber)

In this example, we declare a variable called “myNumber” and assign the value 10 to it. Then, we declare another variable “myDouble” as a Double data type and use the CDbl function to convert the value of “myNumber” to a Double. We can then use the converted value in any further calculations or operations.

#### Explanation:

The CDbl function in this example converts the integer value of 10 to a Double data type, making it suitable for use in calculations that require decimal values. The converted value is then stored in the variable “myDouble”, which can be used later in the code.

### Converting a String to Double

In addition to converting numeric values to Double, the CDbl function can also convert strings that contain numeric values. Let’s look at an example to understand this.

Dim myString As String
myString = "15.25"
Dim myDouble As Double
myDouble = CDbl(myString)
MsgBox "The value of myDouble is " & myDouble

In this example, we declare a string variable called “myString” and assign the value “15.25” to it. We then use the CDbl function to convert this string value to a Double, which is then stored in the variable “myDouble”. Finally, we display a message box to show the value of “myDouble”.

#### Explanation:

By using the CDbl function, we are converting the string “15.25” to a Double data type, making it suitable for use in calculations. Without this conversion, the string would be treated as a text value, and any calculations using it would result in an error.

### Using CDbl with User Input

Another common use of the CDbl function is to convert user input to Double. Let’s look at an example to understand this scenario.

Dim userInput As String
userInput = InputBox("Enter a number:")
Dim myDouble As Double
myDouble = CDbl(userInput)
MsgBox "The value of myDouble is " & myDouble

In this example, we use the InputBox function to prompt the user to input a number. The value entered by the user is stored in a variable called “userInput”. We then use the CDbl function to convert this string value to a Double and display it in a message box.

#### Explanation:

The CDbl function is handy when dealing with user input, as it ensures that the input is converted to the correct data type before performing any calculations. In this example, if the user enters a non-numeric value, the CDbl function will return an error, indicating that the input cannot be converted to a Double.

### Converting Date to Double

In addition to converting numeric values and strings, the CDbl function can also convert dates to Double. Let’s look at an example to understand this.

Dim myDate As Date
myDate = Date
Dim myDouble As Double
myDouble = CDbl(myDate)
MsgBox "The value of myDouble is " & myDouble

In this example, we declare a variable called “myDate” and assign the current date to it using the Date function. We then use the CDbl function to convert this date value to a Double and display it in a message box.

#### Explanation:

The CDbl function treats dates as numeric values, with the whole number representing the days since December 30, 1899, and the decimal representing the time. Therefore, in this example, the converted value will be the number of days since December 30, 1899, which is approximately 43,000.

### Conclusion:

The CDbl function in VBA is a versatile tool that allows us to convert values to the Double data type, making them suitable for use in calculations. It can convert numeric values, strings, and dates to Double, providing flexibility when working with different types of data. Understanding and effectively using this function can greatly enhance the capabilities of VBA in automating tasks and creating custom solutions within Microsoft Office applications.

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Categories: VBA FunctionsLast Updated: September 30, 2023