1 top of file
#define X 0
3
#ifdef X
5 X is defined
#endif
7
#if X
9 X is non-zero
#endif
11
#if error
#error "error message goes here"
#endif
15
#if warning
#warning "warning message goes here"
#endif
19
#if include
#include "inclusion"
#else
23 no inclusion, this is an else clause
#endif
25
#if noelif
27 no elif
#elif elif
29 this is an elif
#else
31 third branch of elif
#endif
33
34 end of file