Data Abstraction : Points to remember

Points to remember:

·        Abstract Data type (ADT) is a type (or class) for objects whose behavior is defined by a set of value and a set of operations.

·        The definition of ADT only mentions what operations are to be performed but not how these operations will be implemented.

·        ADT does not specify how data will be organized in memory and what algorithms will be used for implementing the operations

·        Constructors are functions that build the abstract data type.

·        Selectors are functions that retrieve information from the data type.

·        Concrete data types or structures (CDT's) are direct implementations of a relatively simple concept.

·        Abstract Data Types (ADT's) offer a high level view (and use) of a concept independent of its implementation.

·        A concrete data type is a data type whose representation is known and in abstract data type the representation of a data type is unknown

·        Pair is a compound structure which is made up of list or Tuple

·        List is constructed by placing expressions within square brackets separated by commas

·        The elements of a list can be accessed in two ways. The first way is via multiple assignment and the second method is by the element selection operator

·        Bundling two values together into one can be considered as a pair

·        List does not allow to name the various parts of a multi-item object.