IDENTIFIERS in C

In this blog.....

IDENTIFIER explanation

Rules for forming identifier

some valid identifier

some invalid identifier

eg with program

                                                                                                         

                                                                                                                   

IDENTIFIERS  explanation in c

so what are identifiers , as from the name you can tell that it is some where used in  identify data or object , so what i mean by object here is (functions name ,variables name ) 

so you can say that it is just method of giving meaning full name to object so that when you read your code again you are able to identify the use of that variable or function  in your program.....

Rules for forming identifier

1.) identifier cannot contain any special characters except underscore (eg  :-  n@me   is invalid  but phn_no  is valid ) .

2.) identifier cannot contain 2 succesive underscore (eg :- phn__no  is invalid ) .

3.) keywords (special meaning word) cannot be used as identifier (eg  int  is invalid) .

4.) identifier can only begin with alphabets or underscore but  it is recommended that it should begin  only with alphabets because there are some compiler predefined identifier  starting with underscore  which can cause conflict in  your program  . (eg:- 2_no   is invalid)

5.) identifier can be of  max length 31 but if it is longer than 31 then only first 31 characters are considered .

some valid identifiers

 phn_no ,  roll_no  , Roll_no , vehicle_no

some invalid identifiers

 2noriay ,  n@me  , roll__no(2 successive underscore)  

program eg 

(Note :-  roll_no and Roll_no are 2 different identifiers ,as c is case sensitive )

(leave the comment down below if you have a doubt or suggestions ,thnks🙂)