Final Examination Semester 3 / Year 2010

Transcription

1 Southern College Kolej Selatan 南方学院 Final Examination Semester 3 / Year 2010 COURSE : INTRODUCTION TO OBJECT-ORIENTED PROGRAMMING COURSE CODE : CCIS1103 TIME : 3 HOURS DEPARTMENT : COMPUTER SCIENCE LECTURER : NG MEE MEE Student s ID : Batch No. : Notes to candidates: 1) The question paper consists of 4 pages. Section A: 10 questions ( 20 marks) Section B: 2 questions ( 25 marks) Section C: 4 questions ( 55 marks) 2) Answer all questions. 3) Return the question paper with your answer booklet.

2 SECTION A: MULTIPLE CHOICE QUESTIONS ( 10 X 2.0 = 20 MARKS) Identify the letter of choice that best completes the statement or answer the question. 1. Suppose x is 5 and y is 7. What is the value of the following expression? (x!=7)&&(x<=y) a) false b) true c) This is an invalid expression in d) None of these Java 2. What is the output of the following statement? System.out.println("Welcome \nhome"); a) WelcomeHome b) Welcome Home c) Welcome Home d) Welcome \n Home 3. The expression (int)9.9 evaluates to. a) 9 b) 9.9 c) 10 d) All Java applications must have a method named. a) Main(String[ ] args) b) init() c) main(string[ ] args) d) Init() 5. Call JOptionPane s method to display an input dialog. a) showinput b) showmessagedialog c) showinputdialog d) None of the above 6. What does the following code fragment write to the monitor? int sum = 14; if(sum<20) System.out.println( Under ); else { System.out.println( Over ); System.out.println( the limite. ); a) Under b) Over c) Under the limit. d) Over the limit. 1/4

3 7. Small Java programs downloaded from web pages are called: a) threads b) GUI s c) servlets d) Applet 8. How do you find the length of an array called employees? a) employees.length b) employees.size() c) employees.size d) employees.length() 9. What method do you use to set the height and width of a frame on the screen? a) setposition b) setlocation c) setsize d) setdimension 10. The method parses a string s to a double value. a) double.parsedouble(s); b) Double.parsedouble(s); c) double.parsedouble(s); d) Double.parseDouble(s); SECTION B: SHORT QUESTIONS (25 MARKS) 1. a) Convert the while loop into for loop: (5 marks) int x = 0; while(x < 500){ System.out.println(x); x=x+5; b) Examine the following code: (5 marks) int count = -2; while(count < 3){ System.out.println(count + ); count = count +1; System.out.println(); What does this code print on the monitor? c) The following program is supposed to write out the integers 10, 11, 12, 13, 14, and 15. Decide what should go in the blanks.( 5 marks) class Counter2{ public static void main(string[] args){ int j; j = ; while(j < ) { System.out.println( ); j = ; 2/4

4 2. Answer the following questions based on the array given String[] starhotels={ Mutiara, Bay View, E&Q, Cititel, Sunway, Vistana ; (5 x 2 = 10 marks) a. what is the index of E&Q in the following array? b. Write an expression that refers to the string E&Q within the array. c. What is the value of the expression starhotels.length? d. What is the index of the last item in array? e. What is the value of the expression starhotels[4]? SECTION C: LONG QUESTIONS (55 MARKS) Question 1 Write a java console program that asks user to enter a temperature reading in Fahrenheit, convert it to the equivalent Celsius value and display the Celsius. Use the formula below to convert the Fahrenheit temperature to Celsius: (10 marks) Question 2 Modify the program in Question 1 that will perform a set of Fahrenheit temperature inputs and then the program ask the user if there are more inputs. (10 marks) 3/4

5 Question 3 Write a java program that calculates a salesperson s commission from the numbers of items sold. Assume that all items have a fixed price of RM100 per unit. Use if else statement to implement the following sales commission schedule: (15 marks) Fewer that 10 items sold = 1% commission Between 10 and 39 items sold = 2% commission Between 40 and 99 items sold = 3% commission More than 99 items sold = 4% commission Question 4 Write a program that displays the even numbers between 1 and 9 using: (20 marks) a) for loop b) while loop c) do while loop The program should be written in 3 methods /4