NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY/FEBRUARY 2013 EXAMINATION

Course Code: CIT 834 Time: 3hrs
Course Title: Object-oriented Programming Using C# Course Credit Unit:3
Instruction: Answer any five (5) questions
QUESTIONS
1a.Write a simple program to demonstrate a C# indexer in operation with a new string of 6. (14marks)
1b. In the context of object-oriented programming using C#, write any three (3) possible states of a modifier. (6marks)
[Total =20 marks]

2a. Describe the process of method overloading in object-oriented programming (4marks)
2b. State the condition for using the static property. (6marks)
2c.Write any five (5) basic features of Static Constructors (10 marks)
[Total =20 marks]

3a. Identify the key roles of the following:
i. Data-type (4 marks)
ii. Index-name (4 marks)
3b. Write the standard syntax for declaring accessors in object-oriented programming (12 marks)
[Total =20 marks]

4a. Give a concise description of the term ‘private method’ within the context of object-oriented programming using C#. (10 marks)
4b. In the event that there are two integer variables in a parallelogram class, write the standard syntax for adding these integers. (10 marks)
[Total =20 marks]

5a. State the factor that determines the class of setup instruction used in developing C# (2 marks)
5b. Describe each of the following terms:
i. Namespace (4 marks)
ii. Keyword (4 marks)
5c. Write the source code for a classic Hello C# program (10 marks)

[Total =20 marks]
6a. In the event that an argument in a method is labelled ‘fifty-five’, while the argument
in the TakesInteger is a parameter labelled i, for i=44. Give the expression for passing
the argument from a method referred to as ‘PassesInteger’ to another referred to as ‘TakesInteger’. (14 marks)
6b. State three (3) core steps involved in object-oriented programming. (6 marks)
[Total =20 marks]

7a. Give a concise explanation of the concept of ‘Polymorphism’ as it relates to inheritance and upcasting. (16 marks)
7b. State the key role of inheritance. (4 marks)
[Total =20 marks]