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1 DUBLIN CITY UNIVERSITY SEMESTER ONE EXAMINATIONS 2007 MODULE: Object Oriented Programming I - EE219 COURSE: B.Eng. in Electronic Engineering B.Eng. in Information Telecommunications Engineering B.Eng. in Digital Media Engineering YEAR: 2 and 3 EXAMINERS: Dr. Derek Molloy (DCU Extension 5355) Dr. R. Miller Dr. F. Owens TIME ALLOWED: 2 Hours INSTRUCTIONS: Please answer FOUR questions. All questions carry equal marks Requirements for this paper Please tick (X) as appropriate Log Table Graph Paper Attached Answer Sheet Statistical Tables Floppy Disk Actuarial Tables THE USE OF PROGRAMMABLE OR TEXT STORING CALCULATORS IS EXPRESSLY FORBIDDEN PLEASE DO NOT TURN OVER THIS PAGE UNTIL YOU ARE INSTRUCTED TO DO SO EE219 Object Oriented Programming I Semester 1 Page 1 of 5
2 Question 1 1(a) Examine the following segment of code that has several errors: 01 #import <iostream> 02 namespace std; class Shape private: 07 int x, y; 08 public: 09 Shape(int, int); 10 }; Shape::Shape(int a, int b): a(x), b(y) } class Circle: public Shape int rad = 0; 17 public: 18 Circle(int, int, int); 19 virtual void display(); 20 }; Circle::Circle(int x, int y, int r): Shape(x,y), rad(r) } Circle::display() Shape::display(); 27 cout << "A circle with centre (x,y)"; 28 cout << " and radius: " << rad << endl; 29 } int main(void) Circle c(10,10,5), d(12,12); 34 c.display(); 35 return 0; 36 } Locate the 9 (approximate) errors and describe why you believe there is an error at that location. Use the line numbers to help you to explain your answers. [18 marks] 1(b) Organise the following concepts into suitable class hierarchies: computer, software, PC, DVD, hard-disk, monitor, CPU, DVD drive, Linux, LCD, colour, keyboard, mouse, disk, CD-ROM, Laptop, Dell, Windows XP, Desktop, MacOS. Concisely explain the rationale for your groupings and create appropriate additional classes if required. Draw the resulting hierarchies. [7 marks] EE219 Object Oriented Programming I Semester 1 Page 2 of 5
3 Question 2 2(a) Examine the following class definition: #include <iostream> #include <string> using namespace std; class Vehicle int numberdoors, numberwheels; string color; public: Vehicle(int, int, string); virtual void display(); }; class Car: public Vehicle int numberseats; string modelname; public: Car(int, int, string, int, string); Car(Vehicle, int, string); virtual void display(); }; Write an implementation for each of the methods listed in the class definition. Write a main() function that should test all the methods written. [18 marks] 2(b) Write a new main() function for the classes defined in 2(a) to create an array of Vehicle objects and populate it with Vehicle objects. You should create a pointer that iterates over the array, calling the display() method for each object in the array. Give an alternative pointer operation to the -> operator in C++. [7 marks] Question 3 3(a) Discuss in detail the differences between the C++ and Java programming languages under the following headings (use code where appropriate): Pointers Access Specifiers Memory Management Destructors [14 marks] 3(b) Describe C++ namespaces using a code example. Describe Java packages, again using a code example. How do C++ namespaces compare to Java packages? [11 marks] EE219 Object Oriented Programming I Semester 1 Page 3 of 5
4 Question 4 4(a) Java applets generally do not have a main() method. What is the lifecycle of a Java applet and what standard methods do we have to implement? If we do not implement one of these methods, will the Applet compile? [9 marks] 4(b) What are inline methods in C++? Explain the terms accessor and mutator. [5 marks] 4(c) What are the values of x, y and z that are outputted by this section of code? int main(void) int x, y, z=1, i=5; x=z++; y+=x; for (int i=0; i<10; i++) z = i; } z = z + i; cout << "x has the value: " << x << endl; cout << "y has the value: " << y << endl; cout << "z has the value: " << z << endl; return 0; } [6 marks] 4(d) Discuss the Java classes Object class and Class class. What do they do? What are they used for in the Java language? [5 marks] Question 5 5(a) Write the following Java applet and associated HTML file: where the user inputs u and v as 2-D vectors and theta is the angle between these vectors in degrees, which is calculated automatically when the go button is pressed, according to the formula: θ = cos 1 ( u. v / u v ) where u.v = u 1 v 1 + u 2 v 2 and u = u + (similarly for v) u2 Please see table Q5.1 to see the Math class methods available. [25 marks] EE219 Object Oriented Programming I Semester 1 Page 4 of 5
5 Table Q5.1 The Math class methods Method Summary static double abs(double a) Returns the absolute value of a double value. static float abs(float a) Returns the absolute value of a float value. static int abs(int a) Returns the absolute value of an int value. static long abs(long a) Returns the absolute value of a long value. static double acos(double a) Returns the arc cosine of an angle, in the range of 0.0 through pi. static double asin(double a) Returns the arc sine of an angle, in the range of -pi/2 through pi/2. static double atan(double a) Returns the arc tangent of an angle, in the range of -pi/2 through pi/2. static double atan2(double y, double x) Converts rectangular coordinates (x, y) to polar (r, theta). static double ceil(double a) Returns the smallest (closest to negative infinity) double value that is not less than the argument and is equal to a mathematical integer. static double cos(double a) Returns the trigonometric cosine of an angle. static double exp(double a) Returns Euler's number e raised to the power of a double value. static double floor(double a) Returns the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer. static double IEEEremainder(double f1, double f2) Computes the remainder operation on two arguments as prescribed by the IEEE 754 standard. static double log(double a) Returns the natural logarithm (base e) of a double value. static double max(double a, double b) Returns the greater of two double values. static float max(float a, float b) Returns the greater of two float values. static int max(int a, int b) Returns the greater of two int values. static long max(long a, long b) Returns the greater of two long values. static double min(double a, double b) Returns the smaller of two double values. static float min(float a, float b) Returns the smaller of two float values. static int min(int a, int b) Returns the smaller of two int values. static long min(long a, long b) Returns the smaller of two long values. static double pow(double a, double b) Returns the value of the first argument raised to the power of the second argument. static double random() Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0. static double rint(double a) Returns the double value that is closest in value to the argument and is equal to a mathematical integer. static long round(double a) Returns the closest long to the argument. static int round(float a) Returns the closest int to the argument. static double sin(double a) Returns the trigonometric sine of an angle. static double sqrt(double a) Returns the correctly rounded positive square root of a double value. static double tan(double a) Returns the trigonometric tangent of an angle. static double todegrees(double angrad) Converts an angle measured in radians to an approximately equivalent angle measured in degrees. static double toradians(double angdeg) Converts an angle measured in degrees to an approximately equivalent angle measured in radians. EE219 Object Oriented Programming I Semester 1 Page 5 of 5
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