Understand header files in C programming, their uses, examples like stdio.h, and how #include makes code modular and efficient.

1. Header Files in C Programming
Header file is The collection of predefined standard library functions is included in header
files.
The preprocessing directive "#include" is used to include header files with the ".h" extension
in the program.
SOME FUNCTIONS DEFINED UNDER THE STDIO.H
printf() - This function is used to print the character, string, float, integer, octal and
hexadecimal values onto the output screen.
scanf() - This function is used to read a character, string, numeric data from keyboard.
and many more function.
some examples of header files

2. math.h - mathematical related operations
String.h - string related operation
stdlib.h and many more.
In C programming, header files play a very important role.
They allow programmers to use predefined functions and macros, which saves time and
effort.
Instead of rewriting common functions (like input/output operations, string manipulations,
or mathematical calculations), we can simply include a header file and directly use the
required functions.
Some important points:
 Header files reduce code redundancy.
 They make programs easier to manage and modular.
 Custom header files can also be created by programmers as per their needs using .h
extension.