C Sc 227 Test 1 Review Sheet

C Sc 227 Test 1 Review Sheet Spring 2010

Quick Facts o Friday, 19-Feb-2010 where we have lectures: 301 BIO W o Everyone must have an aisle or two empty seats on either side of you o This Test is 16% of your final grade o Closed books, closed notes o Use pencil, not pen (please) o No electronic devices such as mp3 players. o You do not need a calculator (integer division differs in Java anyway)

Types, both primitive (int, char, double) and reference (String, Scanner, String227) o Evaluate expressions with int and double o Integer arithmetic: 5 / 2 is 2, 5 % 2 is 1 o Know these Math functions: o assertEquals(2.0, Math.sqrt(4.0), 1e-12) o assertEquals(-6, Math.max(-6, -7)) o assertEquals(2, Math.round(1.501)) o Output with print and println o Assignment compatibility rules o Boolean expressions with relational operators, !=, ==, and Boolean operators && || ! o If you cannot write &&, write AND on the test, o String methods: length, compareTo, substring, indexOf, charAt o Scanner object with a String argument at construction using hasNextInt() / nextInt() for string arguments containing integers, or hasNexDouble() / nextDouble() for string arguments containing doubles, or hasNext () / next() for string containing any text separated by whitespace (blanks, \n, or \t) o See practice test question #4, occurencesOf (and the answer to be linked) o Construct objects with constructors: new String227("initial value"); o Send messages to objects: objectReference.messageName(argumentsoptional)

Classes, Methods, Parameters, Testing o Understand method headings, parameters, flow of control when a method is called o JUnit: assertEquals, assertTrue, and assertFalse in test methods that are preceded with @Test o Add methods to classes that have private instance variables and a constructor (String227 specifically)

Control Structures o if statements, if...else, and nested if...else statements o for loops (known number of repetitions) o while loops (unknown number of repetitions)

Arrays 1D o Show output from code with an array, declare arrays, o Process array data: find high, low, average, print all elements in an array o Send messages to objects stored in an array String[0].substring(1, 6); o Swap two values as is done to rearrange two array elements

Resources o Section Leader Review session: Wednesday, 17-Feb, 6:00 - 7:30pm in 701 Gould Simspon o Code demos Page o Chapters 2-9 in Rick’s Book with Self-Checks Questions and Answers at the end of each chapter o Presentations 2-9, o The Practice test handed out Monday o Today's section that will be a test review session o Your projects and homework o Nick Paralante's JavaBat problems that are designed to help Computer Science students study for CS tests