ABL electronic PIC Microcontrollers PIC16 - Manual (Page 71)

The order of constants can be explicitly re-arranged. For example:
enum colors { black, // value 0
red, // value 1
green, // value 2
blue=6, // value 6
violet, // value 7
white=4 }; // value 4
Initializer expression can include previously declared enumerators. For example,
in the following declaration:
enum memory_sizes { bit = 1, nibble = 4 * bit,
byte = 2 * nibble, kilobyte = 1024 * byte };
nibble
would acquire the value 4,
byte
the value 8, and
kilobyte
the value
8192.
Anonymous Enum Type
In our previous declaration, the identifier
colors
is the optional enumeration tag
that can be used in subsequent declarations of enumeration variables of type
colors
:
enum colors bg, border; // declare variables bg and border
As with struct and union declarations, you can omit the tag if no further variables
of this enum type are required:
/* Anonymous enum type: */
enum {black, red, green, blue, violet, white} color;
Enumeration Scope
Enumeration tags share the same name space as structure and union tags.
Enumerators share the same name space as ordinary variable identifiers. For more
information, consult Name Spaces.
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