Modern C for Absolute Beginners: A Friendly Introduction to the C Programming Language

© Slobodan Dmitrović 2021

S. DmitrovićModern C for Absolute Beginnershttps://doi.org/10.1007/978-1-4842-6643-4_31

31. Header and Source Files

Slobodan Dmitrović¹  

(1)

Belgrade, Serbia

 

Our C source code can be divided into multiple files called header files and source files. These files are plain text files containing C source code. By convention, the header files have the .h extension, and source files have the .c extension. Other extensions are also possible.

Standard-library header files are included by surrounding the header name with angle brackets <> as in:

#include <stdio.h>

And user-defined header files are included by surrounding the header file name with double quotes:

#include "someheader.h"

In general, we can place variable and function declarations/interfaces ...