C Enums
An enum is a special type that represents a group of constants (unchangeable values).
To create an enum, use the enum keyword, followed by the name of the enum, and separate the enum items with a comma:
enum Level {
LOW,
MEDIUM,
HIGH
};
Note that the last item does not need a comma.
It is not required to use uppercase, but often considered as good practice.
Enum is short for “enumerations”, which means “specifically listed”.