Topic       : C-Language Documentation
Author      : John Kormylo
Version     : C.HYP 1.0
Subject     : Documentation/C-Language
Nodes       : 233
Index Size  : 6362
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
@lang       : en
@default    : 
@help       : Help
@options    : +g -i -s +x +z -t4
@width      : 75
View Ref-File[ #ifndef ]

  #ifndef macro

If 'macro' is undefined, nothing happens.
If 'macro' if a defined macro name, compilation stops until the
next '#else' '#elif' or '#endif' directive.


See also Preprocessor, #if and #ifdef.