What are header files and what are its uses in C programming?

What are header files and what are its uses in C programming?
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Answer :

Header files are also known as library files. They contain two essential things: the definitions and prototypes of functions being used in a program. Simply put, commands that you use in C programming are actually functions that are defined from within each header files. Each  header file contains a set of functions. For example: stdio.h is a header file that contains definition and prototypes of commands like printf and scanf.
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