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ID : 117
#Ifndef ... #Endif
Function
To determine whether the designated macro is not defined and select a source code to compile.
Syntax
#Ifndef macro name Code 1 #Elif Defined(macro name) Code 2 #Else Code 3 #Endif
Guaranteed entry
- Macro name
- Designate a macro name.
- Code n
- Designate a source code.
Description
To determine whether the designated macro is not defined and select a source code to compile.
If the macro name is not defined, code 1, but no code 2 and code 3, is compiled.
If the macro name is defined, the condition is judged and either of code 2 or code 3 is compiled.
The same as #If Not(Defined(macro name)) ...
Related Terms
Attention
-
Example
'!TITLE "Condition Compile"
' Judge whether a macro is not defined and add a value to aaa
#Define TEST 10
Sub Sample_IfndefEndif
Dim aaa As Integer
aaa = 10
' If a macro name TEST is not defined
#Ifndef TEST
aaa = aaa + 10
' Display a value of aaa on the message output window
PrintDbg "aaa = " & aaa
' If a macro name TEST2 is defined
#Elif defined( TEST2 )
aaa = aaa + 20
' Display a value of aaa on the message output window
PrintDbg "aaa = " & aaa
' If both of a macro name TEST1 and TEST2 are not defined
#Else
aaa = aaa + 30
' Display a value of aaa on the message output window
PrintDbg "aaa = " & aaa
#Endif
End SubID : 117