#ELSEIFNDEF

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgPpelseifndef
• Last revised: 2023-10-02

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Preprocessor conditional directive

Syntax

#ifdef A

' Conditionally included statements if A is defined

#elseifndef B

' Conditionally included statements if both A and B are not defined

#else

' Conditionally included statements if A is not defined and B is defined

#endif

Description

#elseifndef can be added to an #if block to provide an additional condition.

#elseifndef symbol is equivalent to #elseif Not defined(symbol)

Examples

start GeSHi

#IFDEF A
    Print "A is defined"
#ELSEIFNDEF B
    Print "both A and B are not defined"
#ELSE
    Print "A is not defined and B is defined"
#ENDIF

end GeSHi

Version

• Since fbc 1.20.0

Differences from QB

• New to Freebasic

See also

• #define
• #macro
• #if
• #else
• #elseif
• #elseifdef
• #endif
• #ifdef
• #ifndef
• #undef
• defined

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