Chapter 11.11, Problem 11.21CP

Program Plan Intro

Enumeration:

Enumeration is a user-defined data type which consists of enumerators; the enumerators are used to represent integer constants.

• An enumeration can be defined by using the keyword “enum”.
• By default, the values of enumeration type are filled with “0” to “n” sequentially and those default values can be changed when declaring the enumeration.
  • In a sequence of enumerators, if the first enumerator is assigned with a “user-defined value” and the next enumerator is not assigned with any value, then by default the next enumerator will be filled by the value “user-defined value of previous enumerator plus 1”.
• The type name of an enumeration is optional; if name of the enumeration type is not given then it is referred as “anonymous”.

Syntax:

Syntax to declare an enumerated data type is as follows,

enum type_name {identifier_1, identifier_2, identifier_3, … identifier_n};

In the above syntax,

• “enum” is the keyword used to declare an enumerator.
• “type_name” refers the name of the type of the enumerator.
• “identier_1” to “identifier_n” are refers the list of the identifiers declared in the enumerator.