Enumerated data types (enum) in C mean the user has defined the data type in order to make the program easy to read and maintain. Said another way, enum is used to “assign names to integral constants”. Four interesting points to know about enum: (1) if values are not explicitly assigned via enum names, by default the compiler will assign values starting from 0, (2) values can be assigned in any order; all unassigned names get values with the value of the previous name plus one. (3) enum names must be some integral constant in a range from minimum to maximum, and (4) all enum constants must be unique.
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