枚举类型是一种独特的值类型,它用于声明一组具有相同类型的常量。

enum Week
   2: {
   3:     Sunday = 0,
   4:     Monday = 1,
   5:     Tuesday = 2,
   6:     Wednesday = 3,
   7:     Thursday = 4,
   8:     Friday = 5,
   9:     Saturday = 6
  10: }

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