Final Examination Semester 2 / Year 2011

Transcription

1 Southern College Kolej Selatan 南方学院 Final Examination Semester 2 / Year 2011 COURSE : FUNDAMENTALS OF SOFTWARE DESIGEN AND DEVELOPMENT COURSE CODE : PROG1003 TIME : 2 1/2 HOURS DEPARTMENT : COMPUTER SCIENCE LECTURER : SO YONG QUAY Student s ID: Batch No: Notes to candidates: 1) The question paper consists of 7 pages and 16 questions. 2) Students are required to answer all questions. 3) Return the question paper with your answer booklet and softcopy.

2 Part I: Multiple Choice Questions (2 marks each) 1. Which one of the following is NOT a correct Java class name? A. TanMeiMei B. Tan Ooi Ming C. yesterday D. myfirstjavaclass 2. What is item after the following loop terminates? int sum = 0; int item = 0; do item += 1; sum += item; if (sum > 4) break; while (item < 5); A. 2 B. 3 C. 4 D Assume that int a = 1 and double d = 1.0, what is the result of evaluating d -= 1.5 * 3 + (++a)? A B C D Analyze the following code. int a = 0; int b = ((a<100) & (a>=0))? 1: -1; A. The code has a syntax error because & must be &&. B. b becomes -1 after the code is executed. C. b becomes 1 after the code is executed. D. None of above 1 / 7

3 5. How many times is the following loop body repeated? int i =1; while (i < =12) if ((i++) % 3 ==0) System.out.println(i); A. 0 B. 1 C. 11 D Which of the following is a valid boolean expression. A. (x = 1) (X!=1) B. (x =<5) && (x>=3) C. (2 < x < 10) D. a, b, and c are all wrong 7. What is the result of the following remainder? -22 % -5 A. -2 B. 2 C. -4 D What is y after the following switch statement? int x = 0; int y = 1; switch (x + 1) case 0: y = 0; case 1: y = 1; default: y = -1 A. -1 B. 0 C. 1 D. None of the above. 2 / 7

4 9. Which of the loop statements always have their body executed at least once. A. The for loop B. The while loop C. The do-while loop D. None of the above 10. What is y after the following for loop statement is executed? int y = 0; for (int i = 0; i < 10; ++i) y += 1; A. 9 B. 10 C. 11 D. 12 Part II: Converting Code 11. Convert the following switch statement to a if statement. (5 marks) switch(a) case 3: x -= 3; break; case 5: x -= 5; break; case 7: x -= 7; break; case 9: x -= 9; break; default: x-=1; 12. Convert the following while loop statement to a for loop statement. (5 marks) int count = -2 ; while ( count < 4 ) System.out.print( count + " " ); count = count + 1; System.out.println( ); 3 / 7

5 Part III: Show the output of the following programs 13. Show the output of the following three programs: a) (5 marks) public class Test3 public static void main(string args[]) int i =2; while (i <= 5) xmethod(i, 2); i++; public static void xmethod(int i, int num) for (int j =1; j <= i; j++) System.out.print(num + " "); num *=3; System.out.println(); b) (5 marks) public class Test public static void main(string[] args) int[] values = new int[5]; for (int i = 1; i < 4; i++) values[i+1] = i; values[0] = values[1] + values[4]; 4 / 7

6 After the last statement in the main method is executed c) (5 marks) public class ContinueTest public static void main(string[] args) int sum = 0; int number = 0; while (number < 8) number++; if (number == 3 number == 7) continue; sum += number; System.out.println( The number is + number); System.out.println( The sum is + sum); 5 / 7

7 Part IV: Write programs 14. Write a program that will help primary school student to learn multiplication. (25 marks) Use Random generator to produce two positive one-digit integers. The program should then display a question such as: The student then types the answer into a JOptionPane.showInputDialog. Next, the program checks the student s answer. If it is correct, display the result as follow: If the answer is wrong, display the result as follow and let the student try another question. If the student wants to try another question, type 1 to continue. If the student wants to quit the program, type 2. After the student stops to try another question, show the result as follow: 6 / 7

8 Your program should include the following sub-program (Using method): public static boolean checkanswer(int answer, int num1, int num2): a. Pass pre-calculated answer and two random positive digits to the method. b. Use JOptionPane.showInputDialog to type the answer, return true if the answer is correct, return false if the answer is wrong. 15. A palindromic prime is a prime number and also palindromic. For example, 313 is a prime and also a palindromic prime. Write a program that displays the first 100 palindromic prime numbers. Display 10 numbers per line and align the numbers properly, as follows: (18 marks) Your program should include the following sub-programs (Using method): public static boolean isprime (int num): return true if the number is prime number public static int reversal (int num): return an integer in reverse order public static boolean ispalindrome(int num): return true if the number is palindrome number 16. Write a program that reads in eleven numbers, displays the number of distinct value and shows all distinct numbers ( i.e., if a number appears multiple times, it displays once). (12 marks) / 7