enum tvNetworkType {
    ABC,
    CBS,
    NBC,
    FOX
  }

  ABC = 0;
  CBS = 1;
  NBC = 2;
  FOX = 3;

By default, the underlying data type of an enumeration is int. To save space, you can declare the underlying type of tvNetworkType to be of type byte:

  enum tvNetworkType : byte {
    ABC,
    CBS,
    NBC,
    FOX
  }

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