Identifiers

These are user defined names and these indicate to user defined functions, variables, label and arrays. These are the group of Alphabets, digits and underscore (_)

1.       Both uppercase and lower case letters are permitted, although lower case letters are commonly used.

2.       The underscore (_) is usually used as a link between two words in long identifiers

3.       First letter must be Alphabet.

4.       Keywords cannot be used as a identifier.

5.       Maximum length of identifier is 32 for ANSI but many "C" compilers support more then 32.

6.       Any type of special characters just like white space, semicolon, period, and comma are not allowed. Example: - int a; Here a is a user defined identifier. 

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