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2001ACExamAnswers

# 2001ACExamAnswers - T HE UNIVERSITY OF AUCKLAND SUMMER...

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THE UNIVERSITY OF AUCKLAND SUMMER SEMESTER, 2001 COMPUTER SCIENCE Principles of Programming EXAM ANSWERS Question 1 (6 marks): i) String[] allStrings = new String[300]; ii) allStrings[9] = "Relax"; iii) len = allStrings[9].length(); Question 2 (15 marks): public void paint( Graphics g ) { int x,y; int size = 4; //initial size of the square g.setColor(Color.blue); for(int i=0; i<upToInArray; i++){ x = thePoints[i].x; y = thePoints[i].y; g.fillRect(x-size/2,y-size/2,size,size); size++; } } public void actionPerformed(ActionEvent e) { for(int i=0; i<upToInArray; i++){ thePoints[i].translate(-2,0); } repaint(); } public void mousePressed(MouseEvent e) { thePoints[upToInArray] = e.getPoint(); upToInArray++; repaint(); }

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Question 3 (10 marks): private int sumOver(int[][] theInts, int over){ int sum = 0; for (int i=0; i<theInts.length; i++){ for (int j=0; j<theInts[i].length; j++){ if (theInts[i][j] > over){ sum += theInts[i][j]; } } } return sum; } Question 4 (8 marks): Joe Biggs: 9876 Card: 450 Doors 503,702 Ann Sato: 9723 Card: 451 Doors 101,222 Mary Pin: 9561 Card: 452 Doors 301,402 Question 5 (8 marks): i) value: 0 value: 4 value: 6 Final value: 6 ii) 1. X*X 2. X* 3. X 4.
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