slovodefinícia
c preprocessor
(foldoc)
C preprocessor

(cpp) The standard Unix
macro-expansion utility run as the first phase of the C
compiler, cc. Cpp interprets lines beginning with "#" such
as

#define BUFFER_SIZE 256

as a textual assignment giving the symbol BUFFER_SIZE a
value "256". Symbols defined with cpp are traditionally given
upper case names to distinguish them from C identifiers. This
symbol can be used later in the input, as in

char input_buffer[BUFFER_SIZE];

This use of cpp to name constants, rather than writing these
magic numbers inline, makes a program easier to read and
maintain, especially if there is more than one occurrence of
BUFFER_SIZE all of which must all have the same value.

Cpp macros can have parameters:

#define BIT(n) (1
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