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The C standard library is declared as a collection of header files. The C++ standard library is similar, but the declarations may be provided by the compiler without reading an actual file. C standard header files are named with a .h file name extension, as in #include <stdio.h>. Typically, custom C header files have the same extension.
The implementation file will contain the actual definition or source code of the methods declared in the header file. This file can start with a header block, which provides comments that describe the purpose of the defined class and any details about the creation of the actual file, such as the author of the file and date the file was created. [9]
A section starts with a two line header (the first two bytes make up a magic number): \x0c {src_file},{size_of_tag_definition_data_in_bytes} The header is followed by tag definitions, one definition per line, with the format: {tag_definition_text}\x7f{tagname}\x01{line_number},{byte_offset} {tagname}\x01 can be omitted if the name of the tag ...
This directive, inserted at the top of a header file, will ensure that the file is included only once. The Objective-C language (which is a superset of C) has an #import directive, which works exactly like #include , except that it includes each file only once, thus obviating the need for #include guards.
In the C-family of programming languages, declarations are often collected into header files, which are included in other source files that reference and use these declarations, but don't have access to the definition. The information in the header file provides the interface between code that uses the declaration and that which defines it, a ...
Forward-declaration is used to avoid unnecessary coupling which help reducing compilation time by reducing the number of header inclusion. This has a triple advantage: reduce the number of files opened by #include (hence the number of operating system calls) reducing the volume of the pre-processed files (as the header is not included)
The normal methodology is for allocation and actual definitions to go into .c files, but mere declarations and prototypes do not allocate and just describe the types and parameters so that the compiler can work correctly, and that information belongs in a .h header file that others can safely include without any possible conflict.
A Doclet program works with Javadoc to select which content to include in the documentation, format the presentation of the content and create the file that contains the documentation. [7] A Doclet is written in Java and uses the Doclet API, The StandardDoclet included with Javadoc generates API documentation as frame-based HTML files.