A header file is a file with extension .h which contains C function declarations and macro definitions to be shared between several source files.

Syntax :

#include<File>

Header files Examples 

Stdio.h     Input/output function
Conio.h    console input/output function
Stdlib.h    General utility function
Math.h     mathematics function
String.h    string functions
Ctype.h    character handling function
Time.h      date and time function
Float.h      limits of float types
Limits.h      size of basic types

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