# Algorithms and Data Structures Fall 2007 Weisberg Division of Engineering and Computer Science Marshall University

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1 Queues Trees Stacks Recursion Efficiency Correctness Hash Tables etc Algorithms and Data Structures Fall 2007 Weisberg Division of Engineering and Computer Science Marshall University Page 1

3 e. Why is testing a program so important? f. What are some of the commonly used methods of testing a program? g. What are stubs? What are drivers? h. Who should test a program? When should a program be tested? How should a program be tested? Evaluations: In order to evaluate the student s success in mastering the topics listed above: 1. Any or all of the following will be part of the first midterm exam a. Define bugs and defects. b. Define run time errors and syntax errors and explain the difference. c. Describe the use of try-catch-finally blocks. d. Describe stubs and drivers. Describe how a software system should be tested. The student will write Java programs that use try-catch-finally blocks. The student will be asked to demonstrate that he/she can use debuggers in his/her Java IDE III. Efficiency of Algorithms Reading: The student should read section 2.8 of the text Objectives: In this section, the student will learn to: a. Define Big O notation. b. The student will be able to define O(1), O(n), O(n 2 ), O(logn), O(nlogn), and O(n!) c. The student will be able to determine the big O for selected algorithms d. The student will be able to explain why Big-O notation is important Evaluations: In order to evaluate the student s success in mastering the material listed above: 1 The student will demonstrate his/her mastery of the terms listed above on the first midterm exam 2 The student will do lab exercises that demonstrate his/her understanding of the importance of Big O to software engineering IV. Inheritance Reading: The student should read sections , Objectives: In this section the student will review the concepts of inheritance, derived classes, abstract classes, the cosmic class Object, and packages. Evaluations: In order to evaluate the student s success in mastering the material in the above list 1. On midterm one, the student will provide definitions and discussion of the following terms: a. The is a relationship b. The has a relationship c. The Object class d. Overriding and overloading methods e. Casting and cloning Page 3

4 2. The student will write Java program(s) that demonstrate proficiency in using inheritance, overriding, overloading, casting and cloning. Midterm One Midterm one will be given on the topics I, II, III, and IV. It will be scaled to be worth 100 points. It will count 1/3 of the final test average. Programming and Lab assignments in this section will count toward the final programming average. Page 4

6 Objectives: Students will learn the following: a. What is a recursive function in mathematics? What is a recursive function in Java (C, C++, etc) b. How to write recursive functions in Java c. When it is it appropriate to use recursion? When is it not appropriate? d. How to compare and contrast recursive methods with iterative methods e. Students will see examples of recursion including calculation of n!, array searching, and the Towers of Hanoi. 1. On midterm 2, students will be asked to demonstrate their knowledge of Recursive functions and recursive function definitions Advantages and disadvantages of recursion 2. Students will be asked to write at least one Java program that uses recursion to solve a problem Midterm Two Midterm two will be given on the topics I, II, and III above. It will be scaled to be worth 100 points. It will count 1/3 of the final test average. Programming and Lab assignments in this section will count toward the final programming average. Page 6

7 Material for Midterm Exam Three I. Trees Reading: The student should read sections carefully. Students should scan sections 8.5 and 8.6 Objectives: Students will learn the following: a. Basic definitions of trees and binary trees b. Tree traversal in order, post order, and pre order c. How to specify a binary tree d. How to specify a binary search tree 1. On midterm 3, students will be asked to demonstrate their knowledge of a. Trees and associated definitions such as root, node, height, path, subtree, balanced tree, complete tree, etc b. Methods of tree traversal c. How to insert, delete, and retrieve nodes in a binary (search) tree 2. Students will be asked to write a Java program that implements a binary search tree. The program will be written so that the tree can store data from any class. II. Hash Tables Reading: Students should read sections Objectives: Students will learn the following a. The Java Set Interface and the Java Map Interface b. Definition of a Hash Table c. Issues associated with a hash table including collisions, chaining, probing, and hashing functions d. Students will be able to compare and contrast hash tables with linked lists, arrays, and binary search trees 1. On midterm 3, students will be asked to demonstrate a. Their knowledge of the definitions of Maps, Sets, and Hash tables b. How to implement a hash table c. Their knowledge of the characteristics of a good hash table d. Their knowledge of collisions in a hash table and how to deal with them 2. Students will be given several lab and homework exercises to demonstrate their grasp of the concepts from this section. Page 7

8 III. Sorting Reading: Students should read sections Objectives: Students will learn to a. Describe and implement selection sort, bubble sort, insertion sort, Shell sort, Merge sort, and Quick Sort b. Students will learn the Big Oh() associated with each sort c. Students will use the sort method of the Java Arrays class d. Students will learn to compare and contrast any two of the sorts listed in item a 1. On midterm 3, students will be asked to demonstrate a. Their knowledge of the each of the sorts covered in item a in the objectives. Students may be expected to use a by hand walk through for this purpose b. Their ability to compare and contrast the sorts c. Their knowledge of the efficiency of each sorting method 2. Students will be given several lab and homework exercises to demonstrate their grasp of the concepts from this section.. IV. Self Balancing Trees Reading: The student should read sections 11.1, 11.2, and 11.3 Objectives: In this section the student will learn a. Why a balanced tree is desirable b. What it means to do rotations about a node in a tree c. What an AVL tree is d. How to specify an AVL tree e. What a Red-Black tree is f. How to specify a Red-Black tree 1. On midterm 3, students will be asked to demonstrate a. Their knowledge of why balanced trees are important b. Their knowledge of an AVL tree c. Their knowledge of algorithms to balance a tree using AVL algorithms 2. Students will be given several lab and homework exercises to demonstrate their grasp of the concepts from this section. Midterm Three Midterm two will be given on the topics I, II, III, and IV above. It will be scaled to be worth 100 points. It will count 1/3 of the final test average. Programming and Lab assignments in this Page 8

9 section will count toward the final programming average. Attendance, participation, and Decorum Students are expected to behave as if the class is a business meeting. This means Attend and participate in every class. Arrive on time to class Do not sleep during class Leave class only when the class has been dismissed by the instructor Turn cell phone and pagers off before class starts Keep laptops turned off during discussions and lectures Refrain from eating during class. Students may bring drinks that have proper lids. Final Grades Final grades will be determined by weighting the test average by 70% and the lab-homeworkattendance score by 30%. Page 9

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