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Any processed
section
can contain further conditional clauses, nested to any
depth. Each nested
#else, #elif, or #endif directive belongs to the closest pre-
ceding #if directive.
The net result of the preceding scenario is that only one code
section
(possibly
empty) will be compiled.
Directives
#ifdef and #ifndef
You can use the #ifdef and #ifndef directives anywhere #if can be used. The
#ifdef and #ifndef conditional directives let you test whether an identifier is
currently defined or not. The line
#ifdef
identifier
has exactly the same effect as #if 1 if
identifier
is currently defined, and the
same effect as
#if 0 if
identifier
is currently undefined. The other directive,
#ifndef, tests true for the “not-defined” condition, producing the opposite
results.
The syntax thereafter follows that of the
#if, #elif, #else, and #endif.
An identifier defined as NULL is considered to be defined.
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