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2009S1ExamQuestions - CompSci 101 THE UNIVERSITY OF...

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CompSci 101 THE UNIVERSITY OF AUCKLAND CONTINUED FIRST SEMESTER, 2009 Campus: City COMPUTER SCIENCE Principles of Programming (Time Allowed: TWO hours) NOTE: Attempt ALL questions Write your answers in the space provided There is space at the back for answers that overflow the allotted space No calculators are permitted Surname: Forenames: Student ID number: Login name: Q1 (/40) (/40) Q4 (/5) Q7 (/5) Q10 (/8) Q2 (/7) Q5 (/7) Q8 (/7) Q3 (/7) Q6 (/7) Q9 (/7) TOTAL (/100)
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Question/Answer Sheet - Page 2 - CompSci 101 ID: ........................................................ CONTINUED Question 1 (40 marks) a) Write ALL the possible numbers which could be printed by the following statement. System.out.print((int)(Math.random() * 4 + 2)); (2 marks) b) What is printed by the following code? int a = 5; int b = a / 3; double c = a / 4; a = a % 3; System.out.println(a + " " + b + " " + c); (2 marks)
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Question/Answer Sheet - Page 3 - CompSci 101 ID: ........................................................ CONTINUED c) Complete the output produced by the following code. public class Program { public void start() { Point point1 = new Point(20, 15); System.out.println("1. " + point1.x + "," + point1.y); methodC(point1); System.out.println("2. " + point1.x + "," + point1.y); } private void methodC(Point pt2) { pt2.x = 5; pt2.y = 3; pt2 = new Point(2, 4); } } 1. 2. (2 marks) d) Complete the output produced by the following program. public class Program { public void start() { Point point1 = new Point(20, 15); System.out.println("1. " + point1.x + "," + point1.y); methodD(point1); System.out.println("2. " + point1.x + "," + point1.y); } private void methodD(Point pt2) { pt2 = new Point(2, 4); pt2.x = 5; pt2.y = 3; } } 1. 2. (2 marks)
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Question/Answer Sheet - Page 4 - CompSci 101 ID: ........................................................ CONTINUED e) Complete the header of the following method. private methodE ( Rectangle , ) { if (rect.contains(pt)) { return true; } return false; } (2 marks) f) Complete the header of the following method. private methodF ( ) { int[] b = new int[numbers.length]; int limit = 100; for (int i=0; i<numbers.length; i++) { if (numbers[i] < limit) { b[i] = numbers[i]; } else { b[i] = -1; } } return b; } (2 marks)
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Question/Answer Sheet - Page 5 - CompSci 101 ID: ........................................................ CONTINUED g) Complete the output produced by the following code. int xPos = 20; int yPos = 15; int width = 50; int height = 8; Rectangle rect1, rect2, rect3; rect1 = new Rectangle(10, 11, 30, 7); rect2 = new Rectangle(xPos , yPos, width, height); rect3 = new Rectangle(rect1); rect3.x = rect1.y; rect1.y = rect2.height; System.out.println("1. " + rect1.x + "," + rect1.y + "," + rect1.width + "," + rect1.height); System.out.println("2. " + rect3.x + "," + rect3.y + "," + rect3.width + "," + rect3.height); 1. 2. (2 marks) h) Complete the output produced by the following code. Rectangle rect1 = new Rectangle(20, 15, 30, 10); Rectangle rect2 = new Rectangle(rect1); Rectangle rect3 = new Rectangle(10, 10, 20, 20); System.out.println("1. " + (rect1 == rect2)); System.out.println("2. " + rect1.equals(rect2)); System.out.println("3. " + rect1.intersects(rect3)); 1. 2. 3. (2 marks)
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Question/Answer Sheet - Page 6 - CompSci 101 ID: ........................................................ CONTINUED i) What is printed by the following code? int[] list = {1, 2, 3, 4, 5, 6}; System.out.println(list[list.length - list[0]]); (2 marks) j) Complete the method, printTotal() , which prints the total of all the numbers in an integer array. For example, the following code: int [] list1 = {3, 7, 0, 4, 9, 12}; int [] list2 = {0, 3, 5}; printTotal(list1); printTotal(list2); would give the following output: 35 8 public printTotal ( ) { } (2 marks)
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Question/Answer Sheet - Page 7 - CompSci 101 ID: ........................................................
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