ABL electronic PIC12 Benutzerhandbuch

Note: There is also a third version of 

#include

directive, rarely used, which

assumes that neither 

<

nor 

"

appears as the first non-whitespace character follow-

ing 

#include

:

#include 

macro_identifier

It assumes a macro definition exists that will expand the macro identifier into a
valid delimited header name with either of the 

<

header_name>

or

"

header_name"

formats.

The 

#

(pound sign) is a preprocessor directive when it occurs as the first non-

whitespace character on a line. Also, 

#

and 

##

perform operator replacement and

merging during the preprocessor scanning phase.

In C preprocessor, character sequence enclosed by quotes is considered a token
and its content is not analyzed. This means that macro names within quotes are not
expanded.

If you need an actual argument (the exact sequence of characters within quotes) as
result of preprocessing, you can use the 

#

operator in macro body. It can be placed

in front of a formal macro argument in definition in order to convert the actual
argument to a string after replacement.

For example, let’s have macro 

LCD_PRINT

for printing variable name and value

on LCD:

#define LCD_PRINT(val)

Lcd_Out_Cp(#val ": "); \

Lcd_Out_Cp(IntToStr(val));

(note the backslash as a line-continuation symbol)

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