Write about #include Directive?

C programs are divided into modules (or) functions.

Some function are written by users like us & others are stored in the C library.

Library functions are grouped category wise & stored in different files known as header files.

If we want to access the functions stored in the library, it is necessary to tell the complier about the files to be accessed.

This is achieved by using the preprocessor directive #include as follows:

   Ex:  #include < file_name>

          #include

File name is the name of the library file that contains the required functions different preprocessor directives are placed at the beginning of a program