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format file h

What is a h file and how do I open a h file?

H is a header file referenced by a C, C++ or Objective-C source code document. It may contain variables, constants, and functions that are used by other files within a programming project. It allows commonly used functions to be written only once and referenced by other source files when needed. There are two types of header files: the files that the programmer writes and the files that come with the compiler. Including a header file is equal to copying the content of the header file but which is very error-prone and it is not a good idea to copy the content of header file in the source files, especially if we have multiple source file comprising our program. A common practice in C or C++ programs is that it is best to keep all the constants, macros, system wide global variables, and function prototypes in header files and include that header file wherever it is required. H files can be read in a plain text editor.

Mac OS
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Detail h file extension information:
File Type: h
File Format: C/C++ Header File
Primary Association: Development Files
Mime Type: application/x-c, text/plain, text/x-c, text/x-chdr