#ELSEIFDEF

• 来源: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgPpelseifdef
• 最后更新: 2023-10-02

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预处理器条件指令

语法

#ifdef A

' Conditionally included statements if A is defined

#elseifdef B

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

#else

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

#endif

说明

#elseifdef 可添加到 #if 块中，以提供额外的条件。

#elseifdef symbol 等价于 #elseif defined (symbol)

示例

start GeSHi

#DEFINE B

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

end GeSHi

版本

• 自 fbc 1.20.0 起

与 QB 的区别

• FreeBASIC 新增

另请参阅

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

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