#ifndef

Preprocessor conditional directive

Syntax
	#ifndef symbol
		' Conditionally included statements
	KeyPgPpendif#endif

Description
	Conditionally includes statements at compile time.

	Statements within the #ifndef...KeyPgPpendif#endif block are included if symbol is 
	not defined and excluded (ignored) if symbol is defined.

	#ifndef symbol is equivalent to KeyPgPpif#if KeyPgOpNotNot KeyPgDefineddefined(symbol)

Example
	#ifndef __MYFILE_BI__
	#define __MYFILE_BI__
	   ' Declarations 
	#endif

Differences from QB
	* New to FreeBASIC

See also
	* KeyPgPpdefine#define
	* KeyPgPpmacro#macro
	* KeyPgPpif#if
	* KeyPgPpelse#else 
	* KeyPgPpelseif#elseif 
	* KeyPgPpelseifdef#elseifdef 
	* KeyPgPpelseifndef#elseifndef 
	* KeyPgPpendif#endif 
	* KeyPgPpifdef#ifdef
	* KeyPgPpundef#undef
	* KeyPgDefineddefined

