Data Abstraction

Objectives

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• what is Abstract Data structures. • Abstract data type. • Diff erence between concrete and abstract implementation. • Pairs. • Data Abstration in Structure

Summary

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• 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.