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{{fbdoc item="title" value="#IFDEF"}}----
Preprocessor conditional directive

{{fbdoc item="syntax"}}##
**#ifdef** //symbol//
' Conditionally included statements
[[KeyPgPpendif|#endif]]
##
{{fbdoc item="desc"}}
Conditionally includes statements at compile time.

Statements within the ##**#ifdef**...[[KeyPgPpendif|#endif]]## block are included if ##//symbol//## is defined and excluded (ignored) if ##//symbol//## is not defined.

##**#ifdef** //symbol//## is equivalent to ##[[KeyPgPpif|#if]] [[KeyPgDefined|defined]] (//symbol//)##

{{fbdoc item="ex"}}
{{fbdoc item="filename" value="examples/manual/prepro/ifdef.bas"}}%%(freebasic)
#DEFINE _DEBUG
#IFDEF _DEBUG
' Special statements for debugging
#ENDIF
%%

{{fbdoc item="diff"}}
- New to Freebasic

{{fbdoc item="see"}}
- ##[[KeyPgPpdefine|#define]]##
- ##[[KeyPgPpmacro|#macro]]##
- ##[[KeyPgPpif|#if]]##
- ##[[KeyPgPpelse|#else]]##
- ##[[KeyPgPpelseif|#elseif]]##
- ##[[KeyPgPpendif|#endif]]##
- ##[[KeyPgPpifndef|#ifndef]]##
- ##[[KeyPgPpundef|#undef]]##
- ##[[KeyPgDefined|defined]]##

{{fbdoc item="back" value="CatPgPreProcess|Preprocessor"}}
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