Identifiers are sequences of characters used for naming variables, functions, new data types, and preprocessor macros.
- Identifier can be include letters uppercase(A-Z) and lowercase(a-z)
- Identifier can be decimal digits(0-9).
- The first character of an identifier cannot be a digit.
- You Can Include underscore character ?_? in identifiers.The first character of an identifier cannot be a underscore(Some Compilers Accept underscore as a first Charecter).
- Lowercase letters and uppercase letters are distinct, such that foo and FOO are two different identifiers.
- When using GNU extensions, you can also include the dollar sign character ?$? in identifiers.
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