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I am studying the C language, and I saw a new extension that I had not seen before.
What do files with the extension like library.h.in mean?
Is it as the simple header with extension ".h"? What's the difference?
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What is an H file? A file saved with h file extension is a header file used in C/C++ files to include the declaration of variables, constants, and functions. These are referred by the C++ implementation files that contain the actual implementation of these functions.
The inttypes. h file is a C header file that is part of the C standard library and API. It was added with the 1999 version of the ISO C standard (known as C99). It includes the stdint.
h extension are called header files in C. These header files generally contain function declarations which we can be used in our main C program, like for e.g. there is need to include stdio.
These files are usually the input for autoconf which will generate final .h files.
Here's an example from PCRE:
#define PCRE_MAJOR @PCRE_MAJOR@ #define PCRE_MINOR @PCRE_MINOR@ #define PCRE_PRERELEASE @PCRE_PRERELEASE@ #define PCRE_DATE @PCRE_DATE@ Autoconf will replace all variables (@…@) with the respective values and the result will be a .h file.
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Typically, a .h.in file is a header template that is filled in to become the actual header by a configure script based on the outcome of several tests for features present on the target platform.
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