The enumerated types are used for countable items, such as the cards in a deck of ordinary playing cards.
This is a brief introduction. This data type is explained in detail in the chapter on enumerated ordinal types.
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This is a brief introduction. This data type is explained in detail in the chapter on enumerated ordinal types.
The enumerated types are used for countable items, such as the cards in a deck of ordinary playing cards.
Many modern programming languages have an enumerated value data type. If not, a sequence of integers can be used instead. The enumerated data type simply makes it easier to keep track of the meaning of the integer values.
The following material is from the unclassified Computer Programming Manual for the JOVIAL (J73) Language, RADC-TR-81-143, Final Technical Report of June 1981.
Chapter 1 INTRODUCTION, page 3
ITEM INDICATOR STAUS (V(RED),V(YELLOW),V(GREEN));
A status item, whose value can be
thought of as "V(RED)", "V(YELLOW)",
or "V(GREEN)" but which is, in fact,
compactly stored as an integer. Thus
a programmer culd assign "V(RED)" to a
variable to indicate cooling system
failure instead of using a (presumably
non-mnemonic) integer.
Chapter 1 INTRODUCTION, page 5
1.1.5 Built-In Functions
The JOVIAL built-in functions provide advanced, specialized
operations that are not covered by the JOVIAL operators.
NEXT(s,i) The i'th status value after status value s
FIRST(s) First status value in status list for s
LAST(s) Last status value in status list for s
Chapter 1 Introduction, page 9
This is a brief introduction. This data type is explained in detail in the chapter on enumerated ordinal types.
Coding example: I am making heavily documented and explained open source code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).
View music player in action: www.musicinpublic.com/.
Create your own copy from the original source code/ (presented for learning programming).
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Building a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming.
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Created: September 19, 2012
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