Grammaire du préprocesseur C

control-line:
		   #  define identifier token-sequence
		   #  define identifier( identifier , ... ,identifer) token-sequence
		   #  undef identifier
		   #  include <filename>
		   #  include "filename"
		   #  include token-sequence
		   #  line constant "filename"
		   #  line constant
		   #  error token-sequence opt 
		   #  pragma token-sequence opt 
		   # 
		   preprocessor-conditional   
 
preprocessor-conditional:
		   if-line text elif-parts else-partopt #  endif   
 
if-line:
		   #  if constant-expression
		   #  ifdef identifier
		   #  ifndef identifier   
 
elif-parts:
		   elif-line text
		   elif-parts opt 
 
elif-line:
		   #  elif constant-expression   
 
elif-part:
		   else-line text   
 
else-line:
		   #  else