#ifndef

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#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

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