*Identifiers – All the words used in c-programming language except keywords are called Identifier.
That means all the words in a programming language are either keywords or identifier.
*Rules to create identifier-
- Identifier name must be a sequence of letter and digits, and must begin with a letter.
- The underscore character (‘_’) is considered as letter.
- Identifier shuld not be keywords.
- Both upper-case letter and lower-case letter characters are allowed.but there meaning are different.
That means a identifier written in lower-case is not equal to upper-case.In other words identifiers are case sensitive.
- special characters, such as semicolon,period,blank space, slash or comma are not allowed.
