ABL electronic PIC Microcontrollers PIC18 ユーザーズマニュアル

An enumeration data type is used for representing an abstract, discreet set of val-
ues with appropriate symbolic names.

Enumeration is declared like this:

tag {enumeration-list};

Here, 

tag

is an optional name of the enumeration; 

enumeration-list

is a list

of discreet values, enumerators. The enumerators listed inside the braces are also
known as enumeration constants. Each is assigned a fixed integral value. In the
absence of explicit initializers, the first enumerator is set to zero, and each suc-
ceeding enumerator is set to one more than its predecessor.

Variables of 

enum

type are declared same as variables of any other type. For

example, the following declaration

colors {black, red, green, blue, violet, white} c;

establishes a unique integral type, 

colors

, a variable 

c

of this type, and a set of

enumerators with constant integer values (

black = 0

, 

red = 1

, ...). In C, a

variable of an enumerated type can be assigned any value of type 

int

– no type

checking beyond that is enforced. That is: 

c = red;

// OK

c = 1;

// Also OK, means the same

With explicit integral initializers, you can set one or more enumerators to specific
values. The initializer can be any expression yielding a positive or negative integer
value (after possible integer promotions). Any subsequent names without initializ-
ers will then increase by one. These values are usually unique, but duplicates are
legal.

mikroC - C Compiler for Microchip PIC microcontrollers

mikroC

making it simple...

62

MikroElektronika:  Development  tools  -  Books  -  Compilers

page