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Questions and Answers
How does data abstraction aid modifiability?
How does data abstraction aid modifiability?
- It encourages direct manipulation of data structures
- It hides the type definition from clients
- It limits the visibility of subprogram headers
- It organizes everything associated with a data structure together (correct)
What is one advantage of data abstraction related to reliability?
What is one advantage of data abstraction related to reliability?
- User code has full control over data representations
- Direct access to objects of the type is encouraged
- Dependence on the representation ensures stability
- Hiding data representations allows the representation to be changed without affecting user code (correct)
What is a language requirement for Abstract Data Types (ADTs)?
What is a language requirement for Abstract Data Types (ADTs)?
- Complete concealment of type names and subprogram headers from clients
- A method of making type names and subprogram headers visible to clients while hiding actual definitions (correct)
- Encouragement of direct manipulation of actual definitions by clients
- Limited visibility of type names and complete visibility of actual definitions
Why is reducing the range of code and variables important in data abstraction?
Why is reducing the range of code and variables important in data abstraction?
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What does data abstraction provide as a method of program organization?
What does data abstraction provide as a method of program organization?
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Study Notes
The Concept of Abstraction
- Abstraction is a fundamental concept in programming and computer science.
- It involves representing an entity by including only its most significant attributes.
Introduction to Data Abstraction
- An abstract data type is a user-defined data type that satisfies two conditions:
- The representation of objects of the type is hidden from the program units that use these objects.
- The only operations possible are those provided in the type's definition.
- The declarations of the type and the protocols of the operations on objects of the type are contained in a single syntactic unit.
- Other program units are allowed to create variables of the defined type.
History of Abstraction in Programming Languages
- Nearly all programming languages support process abstraction with subprograms.
- Nearly all programming languages designed since 1980 support data abstraction.
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