Basic Definitions Data Structures: Data Structures: A data structure is a systematic way of organizing and accessing data. Or, It’s the logical relationship.

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Presentation transcript:

Basic Definitions Data Structures: Data Structures: A data structure is a systematic way of organizing and accessing data. Or, It’s the logical relationship between data elements. A data structure is a systematic way of organizing and accessing data. Or, It’s the logical relationship between data elements. Types of Data Structures: Types of Data Structures: - Linear D.S., such as arrays, stacks, queues. - Non-linear D.S., such as tree. Arrays: Arrays: An array is a numbered (indexed) collection of variables, all of the same type.

Storage Structure: Storage Structure: It is the physical (actual) representation of data elements in storage (memory). Types of Storage Structures: Types of Storage Structures: 1- Sequential S.S. (Suitable for storage of static D.S. such as arrays) (Suitable for storage of static D.S. such as arrays) 2- Linked S.S. (Suitable for storage of dynamic D.S.)

ADT (Abstract Data Type): It is a mathematical model of a data structure that specifies the following: - the Type of data stored, - the Operations performed (supported) on them, and - the Types of Parameters of these operations. An ADT is modeled in Java by a class. Abstraction: An ADT specifies what each operation does, but not how it does it.

Classes: Classes: A class defines the data being stored and operations supported by the objects. Objects : Objects : An objects is an instance of the class. Interfaces : Interfaces : An interface is simply a list of method declarations, where each method has an empty body.

Algorithm: Algorithm: An algorithm is a step-by-step procedure for performing some task in a finite amount of time. An algorithm is a step-by-step procedure for performing some task in a finite amount of time. Pseudo Code Pseudo Code An algorithm is written (expressed) in a mixture of Natural languages and High-level programming languages, this is called pseudo code. A Program: A Program: A program is the implementation (translation) of an algorithm in some high-level programming language.