Abl-electronic PIC Microcontrollers PIC16 Bedienungsanleitung PDF herunterladen (Seite 70)

Enumerations

An enumeration data type is used for representing an abstract, discreet set of val-

ues with appropriate symbolic names.

Enumeration Declaration

Enumeration is declared like this:

enum

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

enum 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.

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