#ifndef
 
Preprocessor conditional directive

Syntax

#ifndef symbol
' Conditionally included statements
#endif

Description

Conditionally includes statements at compile time.

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

#ifndef symbol is equivalent to #if Not defined(symbol)

Example

#ifndef __MYFILE_BI__
#define __MYFILE_BI__
    ' Declarations 
#endif


Differences from QB

  • New to FreeBASIC

See also