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NATIONAL OPEN UNIVERSITY OF NIGERIA
UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
MARCH/APRIL 2015 EXAMINATION
COURSE CODE: CIT383
COURSE TITLE: Introduction to Object-Oriented Programming
TIME ALLOWED: 2½ Hours
INSTRUCTIONS: Answer any Four (4) Questions
1a. What is the value of x after each of the following statement is executed?
(i) x=Math.abs(-3.5); (ii) x=Math.floor(-3.7);
(iii) x=Math.ceil(6.3); (iv) x=Math.floor(4.1);
(v) x=Math.ceil(-2.5); (vi) x=Math.pow(3.7);
(vii) x=Math.ceil(-Math.abs(5+Math.floor(-3.2))); 1 ½ marks each
1b. List three popular Object Oriented Languages? 3 marks
1c. Mention two advantages of software reusability 4 marks
2a. What is Encapsulation? 3 marks
2b. Give the full meaning of the following acronyms:
(i) WYSIWYG (ii) OSI (iii) PCS (iv) RDO
(v) ADT (vi) OOD (vii) JVM (viii) API
(ix) DLS (x) SNMP 1 mark each
2c. List three main features of Object Oriented Programming? 4 ½ marks
3a. What is Inheritance in Object-Oriented Programming Language? 5 marks
3b. Explain the term “methods”? 8 marks
3c. List three (3) examples of methods 4 ½ marks
4a What do you understand by Operator Overloading? 9 marks
4b. List two major Aspect of Object-Oriented Programming that promotes software reuse 4 marks
4c. List the three (3) logical operators that can be directly overloaded for a class 4 ½ marks
5a. What do you understand by Recursive Operator? 4 marks
5b. Mention the three (3) ways to call a method 4 ½ marks
6a. What is the difference between a Class and an Object? 8 marks
6b. Explain the term “downcasting” 5 marks
6c. Enumerate, giving examples any three (3) examples of Message Passing styles 4 ½ marks
