KNEC Diploma in ICT module 2 Object Oriented Programming past paper: November 2013 Answers

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Course Name:  Information and Communication Technology
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Course Level:  Diploma
Sub Level:       Module II
Course Unit:   Object Oriented Programming
Exam body:    KNEC
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1. List four examples of object oriented programming languages other than C++. ()
2. Explain the term unstructured programming ()
3. write an if control structure statements equivalent to the following C++ program statement x = (a>b) ? a:b; ()
4. Explain a circumstance under which each of the following access specifier would be used in a C++ program: I. private; II. protected. ()
5. Differentiate between hybrid object oriented databases and pure object oriented databases ()
6. Write a C++ program that would define a class named power with the following properties: Data member: •product Member function: •power; •calculate_power. (using for loop control structure) The program should then accept two integer values (x and y) and determine the value of xy through the use of the member function calculate power. The program should then output the results ()
7. Explain each of the following terms as used in object oriented programming languages (i)Abstraction; (ii)SizeOf ()
8. Differentiate between keyword and identifier as used in object oriented programming language ()
9. Write a C++ programs that accepts 20 characters from the computer keyboard and the program should store the characters in a text file. ()
10. Write a C++ program that accepts interior dimensions in meters of a cubical tank. The program should then calculate and output: (i)The interior surface area; (ii) The quantity of paint required for the interior surface area given that 1 liter cover 2 square meters ()
11. Outline three characteristics of static data member as used in object oriented programming ()
12. Explain three uses of nested class as used in object oriented programming language. ()
13. Describe a virtual class as used in object oriented programming language ()
14. State two properties of static member function as used in C++ programming ()
15. Explain the purpose of getline() as used in C++ programs ()
16. State two reasons that justify the use of files in C++ programs ()
17. Differentiate between binary and unary operator overloading as used in object oriented programming languages. ()
18. Differentiate between binary and unary operator overloading as used in object oriented programming languages. ()
19. Figure 1 shows categorized data types as used in C++ programs. Use it to answer the questions that follows. List two examples for each of the categories ()
20. Given that a=4 and b=6, determine the value of a|b. ()
21. Write the general syntax for operator overloading ()
22. State reasons for the use of operator overloading ()
23. State three uses of a friend class in object oriented programming ()
24. Explain the term virtual function as used in object oriented programming language ()
25. Explain a circumstance under which each of the following operator can be overloaded: I. [ ]; II. (); III. >> ()
26. Differentiate between a compound assignment operator and a relational operator. ()
27. interpret each of the following C++ program statements; (i) b=(int) a; (ii) int b(int a); ()
28. write the syntax for defining a destructor in a C++ program ()
29. Figure 2 shows a class inheritance. Use it to answer the question that follows. Write a C++ program that would implement the classes named teacher and person. The program should then accept the name ,age, basic salary, house allowance, rate of taxation and calculate the net salary through the Compute_netsal(). The program should then output the net salary. Hint: tax=basic salary*rate ()
30. Outline two purpose of a free store in programming ()
31. Explain each of the following terms as used in object oriented programming language. (i) Runtime polymorphism; (ii) Pure virtual function. ()
32. Differentiate between windows based and a command based operating system ()
33. Class C is a derived class of class B, class B is a derived class of class A. class C and B are the base classes of class D. I.Represent this inheritance in a diagram II. Write a C++ program syntax to represent this classes ()
34. Explain a circumstance under which a friend function can be used to overload an operator. ()
35. Figure 3 shows the dimension of a ring. Use it to answer the questions that follows. Write a C++ program that accepts the values r1 and r2 and calculate the area of the shaded part through the use of inline function. The program should the output the shaded area. (5 marks) Hint: area of a circle=pie*Radius*Radius. ()
36. Define the term coercion polymorphism as applied in OOP ()
37. Use the following C++ program segment to answer the questions that follows: float radius=7.0; int area; float pie=3.14; area= pie*radius*radius. Compute the value of the area ()
38. Explain each of the following terms as used in object oriented programming: (4 marks) (i) static resolution (ii) virtual destructor ()
39. Object oriented programming language has both classes and structures. Justify the existence of each of these two in this language. ()
40. State the output from the following C++ program. (2 marks) #include<iostream.h> int a=10; int main() { int m=20; int b=a; int a=5; cout<< “B =”<)
41. Given that a=2, b=25, c=8 and d=5, evaluate each of the following C++ program equations. (6 marks) I. y=(y=a,y*2); II. x= (a*sqrt(b)*d%a)-(c/a+(a*b/d)); III. z=(4/a+c/2*(c+d)*b); ()
42. The following is a C++ program segment. Use it to answer the question that follows float num1=8.3; int num2=10; double num3=2.4; int result = (int)num1+(int) num2 +(int) num3; Calculate the value of the result. ()
43. Define the term public inheritance as used in OOP ()
44. Explain two reasons that justify data hiding in object oriented programming ()
45. With an aid of a example, explain the term message passing as used in object oriented programming language ()
46. Explain one reason that justify the use of typedef specifier in C++ programming ()
47. List four characteristics of constructor as used in OOP ()
48. Write a C++ program that declares the following data structure: enum Object { Square, Cube, Sphere }; The program should prompt the user to enter the object index, using the switch control structure, the program should then calculate and output the area of the square and the volume of the cube and sphere. ()
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