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Data Structures Winter 2012 What is a Data Structure? • A data structure is a method of organizing data. • The study of data structures is particularly important when using a procedural programming language. Simple Data Types • Many programming languages provide built-in simple data types. For example: – – – – – Characters Integers Real Numbers Boolean (TRUE, FALSE) Strings (words) Arrays • A one-dimensional array can be thought of as a list or a vector. It is a homogeneous collection of data. • For example, an array of 10 integers might take 20 bytes of storage. If the name of the array is IntArray, the 10 integers might be accessed as IntArray[0], IntArray[1], ... , IntArray[9]. Arrays II • Most programming languages provide builtin arrays. • Most programming languages provide for multi-dimensional arrays. • A two-dimensional array, for example, allows the programmer to think of the data as being organized in a table (rows and columns). Note this is a virtual table. Records • A record is a heterogeneous data structure. • For example, a student record, or a customer record. • The individual components of a record are called fields. Abstract Data Type • An ADT is a data structure together with the operations that are allowed on the data structure. • STACK: FILO structure, top, Push, Pop • QUEUE: FIFO structure, head, tail (front, back), Enqueue, Dequeue • LIST: head, tail, current, Insert, Delete, Next Pointers • A pointer is a structure that contains not data but an address that points to data. • The Program Counter can be considered as a pointer. • Pointers allow for dynamic memory allocation. • Many data structures can be implemented either with dynamic or static memory allocation. Other Structures • Trees: Family tree, Directory • Graphs: A general graph is a mathematical structure that consists of a set of vertices and a set of edges. The study of graph theory is very important in theoretical Computer Science. To study for the quiz What is an Abstract Data Type? Be able to describe the following ADT’s by their actions and how they can be implemented: Stack, Queue, Binary Tree, Graph Distinction between dynamic and static.