Identifies in C


identifiers are nothing but the name given to variables, constants, functions and user-defined data.

Rules for an identifier:

  • Keywords are not allowed to use as an identifier. Identifier may contains ( a-z, A-Z, 0-9 ) and underscore.

  • The first character of an identifier must contain alphabet (a-z, AZ) or underscore( _ ).

  • No special characters such as space semicolon, comma are permitted to use as an identifier.

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