B.6. If Statements

The If statement is probably one of the most widely used statements. It checks a Boolean value or the value of a Boolean comparison and if it is trUE, code runs. You can have a single line If statement or a code block ended by End If. One thing I notice is that some people have a Boolean value but they still put a test in to see whether it is trUE, which is unnecessary. For example, the IsNumeric statement returns a Boolean. Putting in IsNumeric(x) = TRUE is the same as putting in IsNumeric(x). Putting in IsNumeric(x) = False is the same as putting in Not IsNumeric(x). See the following example.

 Dim x As String Dim y As Double x = InputBox("Enter a number", "Input Required") If IsNumeric(x) Then    y = CDbl(x)    If y / 2 = Int(y / 2) Then MsgBox "Number is Even", vbInformation    If y / 2 <> Int(y / 2) Then MsgBox "Number is Odd", vbInformation End If If Not IsNumeric(x) Then MsgBox "You did not enter a number", vbInformation 

If you are in Excel, you can use the worksheet functions IsEven and IsOdd. However, testing whether a number divided by two is equal to the integer of that result is another way to test whether a number is even.