| slovo | definícia |
preprocessor
(encz) | preprocessor,preprocesor n: Zdeněk Brož |
preprocessor
(foldoc) | preprocessor
macro preprocessor
A program that transforms input data in some way
before it is read by the main program. In the case of a
compiler, the input is source code. The main advantage of
using a preprocessor is that it is possible to change the
specification of the input data without changing the main
program. The separation can also help to make the system's
overall behaviour easier to understand. The disadvantage is
that performance may be reduced by the extra input and output
performed between the two programs.
For example, the C preprocessor, cpp, handles textual
macro substitution (it acts as a "macro preprocessor"),
conditional compilation and inclusion of other files.
A preprocessor may be used to transform a program into a
simpler language, e.g. to transform C++ into C.
(2007-04-05)
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| | podobné slovo | definícia |
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 |
macro preprocessor
(foldoc) | preprocessor
macro preprocessor
A program that transforms input data in some way
before it is read by the main program. In the case of a
compiler, the input is source code. The main advantage of
using a preprocessor is that it is possible to change the
specification of the input data without changing the main
program. The separation can also help to make the system's
overall behaviour easier to understand. The disadvantage is
that performance may be reduced by the extra input and output
performed between the two programs.
For example, the C preprocessor, cpp, handles textual
macro substitution (it acts as a "macro preprocessor"),
conditional compilation and inclusion of other files.
A preprocessor may be used to transform a program into a
simpler language, e.g. to transform C++ into C.
(2007-04-05)
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php: hypertext preprocessor
(foldoc) | PHP: Hypertext Preprocessor
PHP
(PHP) An Open Source,
server-side, cross-platform, scripting language used to
create dynamic web pages.
PHP can be embedded in HTML using special tags like:
This is stored in a file with a ".php" extension. The {web
server} passes the file to the PHP interpreter which
executes the code in the tags. The tagged code
is then replaced with its output, typically ordinary HTML, in
the response sent to the web browser.
PHP is a recursive acronym.
PHP Home (http://php.net/).
{Cheat sheet
(http://addedbytes.com/cheat-sheets/php-cheat-sheet/)}.
(2010-03-20)
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