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C Identifiers

What are identifiers in c programming.

by Athil


Posted on 22 Jan 2017 Category: C Views: 977

Edited on 03 Jun 2017


Identifiers are names given to various elements of a program, such as variables, functions, and arrays. An identifier may consist of digits and letters. But there are certain rules to give name to an identifier.

Rules

1.We can use numbers underscore (_) symbol and characters.
2. The First character must be a letter or underscore(_) symbol.
3. We can use Upper case and Lower case. But both have different meaning.
4. We can start with underscore symbol(_) also.
5. No other symbols are accepted.
6. We cannot give a keyword as an identifier.

 

Some valid identifiers
aaa, abc, ship, flag, Id_no, _customer_no etc
Some Invalid identifiers
201, “y”, ship No, flag error etc



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