Enumeration constants are identifiers defined in enum type declarations. The identifiers are usually chosen as mnemonics to contribute to legibility. Enumeration size is calculated according to the enumerators (enumeration elements). They can be used in any expression where integer constants are valid.

For example:

enum weekdays { SUN = 0, MON, TUE, WED, THU, FRI, SAT };

The identifiers (enumerators) used must be unique within the scope of the enum declaration. Negative initializers are allowed. See Enumerations for details about enum declarations.

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