C++ LANGUAGE ENUMERATED TYPES PAGE 14

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C++ LANGUAGE ENUMERATED TYPES

Enumerated Types 


An enumerated type declares an optional type name and a set 
of zero or more identifiers that can be used as values of the 
type. Each enumerator is a constant whose type is the enumeration. 
Creating an enumeration requires the use of the keyword enum. 

The general form of an enumeration type is: 

enum enum-name { list of names } var-list;  

Here, the enum-name is the enumeration's type name. The list 
of names is comma separated. 
For example, the following code defines an enumeration of 
colors called colors and the variable c of type color. 
Finally, c is assigned the value "blue". 

enum color { red, green, blue } c; 

c = blue; 

By default, the value of the first name is 0, the second 
name has the value 1, and the third has the value 2, and 
so on. But you can give a name, a specific value by adding 
an initializer. For example, in the following enumeration, 
green will have the value 5. 

enum color { red, green=5, blue }; 

Here, blue will have a value of 6 because each name 
will be one greater than the one that precedes it.