C programming Character Set

A character denotes any alphabets,digit or special symbol used to represent information.

Some special character set are allowed in C language.Those are primary character set and secondary character set.

                                   *Integer constants 

                            *Real constants

                            *float constants  are available in C language

And then the secondary constants are user defined functions

User defined functions are as follows

                            *Structures

                            *Unions

                            *enumerators 

These are vital part of user defined functions and other user defined functions also available in C.