COMP 14 Introduction to ProgrammingParts of the ComputerQuestions - HardwareQuestions - SoftwareQuestions - BinaryQuestions: Java BasicsQuestions – IdentifiersQuestions - ExpressionsQuestions - AssigningQuestions – Valid StatementsQuestions – Variables and ObjectsDecimal Format ExamplesComparing CharactersComparing Floating-PointComparing StringsBoolean OperatorsQuestionsSlide 18Slide 19Slide 20Selection StatementsLoopsObject-Oriented Design Simplified MethodologyThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian IlieCOMP 14Introduction to ProgrammingAdrian IlieJuly 11, 2005The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie2________- computer components including the CPU, main memory, I/O devices, and secondary storage________ - the brain of the computer, containing the CU, PC, IR, ALU, and ACC________ - computer instructions to solve a problemThe digits 0 and 1 are called _________or the shortened term ________Parts of the ComputerhardwareCPUprogrambinary digitsbitsThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie3Questions - Hardware ____________- points to the next instruction to be executed ____- a unique location in memory ____________- stores information permanentlyInstructions executed by the CPU must be first loaded to ________program counter (PC)addresssecondary storagemain memoryThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie4Questions - SoftwareClassify the following pieces of software as operating system or application:1. Microsoft Windows 20002. Microsoft PowerPoint3. Linux4. Your COMP 14 programsOSOSappappThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie5Questions - Binary•What’s the maximum value a 6-bit number can represent?•What’s the decimal representation of 111010?•What’s the binary representation of 35?26-1=6325*1+24*1+23*1+22*0+21*1+20*0=583510=1000112The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie6Questions: Java Basics1. The ________ rules of a language determine which instructions are valid.2. True or False? Hello! is an example of a legal Java identifier. _______3. If an operator has an integer and a floating-point operand, the result of the operation is a ___________ number.4. The expression (int) (9.2) evaluates to ___.syntaxFalsefloating-point9The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie7Questions – IdentifiersClassify the following as legal or illegal identifiers:1. My First Program ____2. my1stProgram ____3. 1stProgram ____4. $money ____5. an_identifier ____6. Jane'sProgram ____illegallegalillegallegallegalillegalThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie8Questions - Expressions 1. (5 + 4) % 62. (5 + 6) % 3.53. (double) (13) / 24. (double) (13 / 2)9 % 6311 % 3.5not possible(double) (6)6.013.0 / 26.5The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie9Questions - AssigningWhat is stored in the memory location referred to by the identifier num after each of the following statements is executed in order?int num; ______num = 5; ______num = 5 + 4 - 2; ______num = num * 3; ______num = 3.4 + 5; ______unknown5721errorwould give an error since 3.4 + 5 wouldnot result in an intThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie10Questions – Valid StatementsWhich of the following are valid Java assignment statements? Assume that i, x, and percent have been declared as double variables and properly initialized.1. i = i + 5; ______2. x + 2 = x; ______3. x = 2.5 * x; ______4. percent = 10%; ______validinvalidvalidinvalidThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie11Questions – Variables and Objects1. True or False. A primitive variable is a variable that stores the address of a memory space. ______2. The operator ____ is used to create a class object.3. In Java, the ________ operator is used to access members of a class. It separates the class (or object) name from the method name.4. True or False. Class objects are instances of that class. ______newdot (.)FalseTrueThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie12Decimal Format ExamplesDecimalFormat twoDecimal = new DecimalFormat("0.00");DecimalFormat fmt = new DecimalFormat("0.##");System.out.println (twoDecimal.format(56.379)); _______System.out.println (fmt.format(56.379)); _______System.out.println (twoDecimal.format(.3451)); _______System.out.println (fmt.format(.3451)); _______System.out.println (twoDecimal.format(.3)); _______System.out.println (fmt.format(.3)); _______56.380.350.3056.380.350.3The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie13Comparing Characters•'a' > 'A'•'6' < 7•' ' <= 's'97 > 65 true54 < 7 false32 <= 115 trueThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie14Comparing Floating-Point3.0 / 7.02.0 / 7.0(3.0 / 7.0) + (2.0 / 7.0) + (2.0 / 7.0) == 10.4285714285714285false0.2857142857142857If we did this math with exact arithmetic, this expression would be true0.9999999999999999The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie15Comparing StringsGiven String str = "Homer";str.compareTo("Marge") str.equals("homer")str.compareTo("Bart")negative valuefalsepositive valueThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie16Boolean Operators•NOT ! (unary)!(2+2==5)•AND && (binary)(2+2==5) && (1+1==2)•OR || (binary)(2+2==5) || (1+1==2)truefalsetrueThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie17Questions1. What type of primitive variable can the result of a logical expression be stored in? _______2. Under what conditions would the expression ((ch >= 'A') && (ch <= 'Z')) evaluate to false? ______________________3. What method do you use to compare two Strings? __________4. Why is 'a' greater than 'A'? ______________________________________booleanch < 'A' or ch > 'Z'compareTo'a' comes after 'A' in the ASCII character tableThe UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie18QuestionsGiven the following declarations, evaluate each Boolean expression:int count = 0, sum = 54;double x = 4.3, y = 1.2;boolean wrong = true;1. (wrong && sum > 60)2. ((x > 5) || !(sum == 55))3. !((y > 1.0) && (x < 4))4. ((count != 4) || (sum > 100) && wrong)falsetruetruetrue(false || !(false))!(true && false)(true || false && true)(true && false)(true || false)The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Adrian Ilie191. What is printed if movieRating is 1 and movieName is "Gigli"?2. What is printed if movieRating is 5?QuestionsAssume movieRating is an int and movieName is a