What is an H File?
A file with a .H extension is a header file written in C, C++, or Objective-C source code that usually contains constants, variables, and functions. Such files are used by other programs since they contain commonly-used functions and code that may be repeatedly required.
The definitions of macros that can be utilized by numerous source files are often stored in H header files together with the declarations of C functions. Note that the H files can also store information in the C++ programming language, but those are usually saved in the .HPP files.
Download H Sample Files
Download different .H sample files from below and test them as required.