Справочник Пользователя для ABL electronic PIC Microcontrollers PIC18

If you need to break directive into multiple lines, you can do it by ending the line
with a backslash (

\

):

#define MACRO  This directive continues to \

the following line.

Macros provide a mechanism for token replacement, prior to compilation, with or
without a set of formal, function-like parameters.

The 

#define

directive defines a macro:

#define 

macro_identifier <token_sequence>

Each occurrence of 

macro_identifier

in the source code following this control

line will be replaced in the original position with the possibly empty

token_sequence

(there are some exceptions, which are noted later). Such

replacements are known as macro expansions. The 

token_sequence

is some-

times called body of the macro. An empty token sequence results in the removal of
each affected macro identifier from the source code.

No semicolon (

;

) is needed to terminate a preprocessor directive. Any character

found in the token sequence, including semicolons, will appear in the macro
expansion. The 

token_sequence

terminates at the first non-backslashed new

line encountered. Any sequence of whitespace, including comments in the token
sequence, is replaced with a single-space character.

After each individual macro expansion, a further scan is made of the newly
expanded text. This allows for the possibility of nested macros: The expanded text
can contain macro identifiers that are subject to replacement. However, if the
macro expands into what looks like a preprocessing directive, such a directive will
not be recognized by the preprocessor. Any occurrences of the macro identifier
found within literal strings, character constants, or comments in the source code
are not expanded

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