How to use IsNumeric function in VBA?

In VBA (Visual Basic for Applications), the `IsNumeric` function is used to determine if an expression can be evaluated as a number. This function returns a Boolean value: `True` if the expression is a number or can be converted to a number, and `False` otherwise.

Here’s a simple example of how to use the `IsNumeric` function:

Sub CheckIfNumeric()
    Dim testValue As Variant
    
    testValue = "123.45"
    
    If IsNumeric(testValue) Then
        MsgBox "The value is numeric."
    Else
        MsgBox "The value is not numeric."
    End If
End Sub

In this example, `testValue` is assigned a string that represents a decimal number. The `IsNumeric` function then checks if `testValue` can be treated as a number. Since “123.45” is a valid numeric string, the function returns `True` and the message box displays “The value is numeric.”

Here’s another example where `testValue` is not a number:

Sub CheckIfNumeric()
    Dim testValue As Variant
    
    testValue = "Hello World"
    
    If IsNumeric(testValue) Then
        MsgBox "The value is numeric."
    Else
        MsgBox "The value is not numeric."
    End If
End Sub

In this case, “Hello World” is not a number, so `IsNumeric` returns `False`, and the message box will display “The value is not numeric.”

`IsNumeric` can be used to check a wide range of expressions, such as variables, literals, or expressions that result from calculations or user inputs. It’s commonly used for input validation or error handling when performing mathematical operations.

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