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Revision as of 13:55, 30 December 2007 (edit) Sandman (Talk | contribs) (New page: category:precompiler == Definition == '''#ifndef''' <what to check> :<if block> ['''#else :<else block>] '''#endif''' Checks if ''what to check'' was previously defined in the code. ...) ← Previous diff

Current revision (13:55, 30 December 2007) (edit) (undo) Sandman (Talk | contribs) (New page: category:precompiler == Definition == '''#ifndef''' <what to check> :<if block> ['''#else :<else block>] '''#endif''' Checks if ''what to check'' was previously defined in the code. ...)

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Current revision

[edit] Definition

#ifndef <what to check>

<if block>

[#else

<else block>]

#endif

Checks if what to check was previously defined in the code. If it isn't, the code in if block will be compiled. If it is, the code in else block will be compiled or when there is no else block, the compiler will continue after #endif.

It is the opposite of #ifdef.

Precompiler statements

#define • #ifdef • #ifndef • #endif • #else • #if