NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
OCTOBER 2019 EXAMINATION

COURSE CODE: CIT392
COURSE TITLE: COMPUTER LABORATORY II
CREDIT: 2 CREDIT UNITS
TIME ALLOWED: 2 HOURS
INSTRUCTION: ANSWER QUESTION ONE (1) AND ANY OTHER THREE (3) QUESTIONS

1a) Briefly describe a constant in C++ programming language. Illustrate your answer with example(s). (4 marks)
b) Outline the non-numeric data types in C++ (4½ marks)
c) Define a Delimiter in Ada and state the different types. (2½ marks)
d) State four (4) common features of COBOL (2 marks)
e) Briefly describe the types of packages in Ada (5 marks)
f) Write a short note on the concept of Shells in Linux (3 marks)
g) Outline four (4) transactional control commands in database. (4 marks)

2a) Discuss in detail what you understand by a pointer in C++ (5 marks)
b) There are different independent libraries for input/output operations in Ada. Describe any four (4)
of them. (10 marks)
3a) Highlight in a tabular form (as specified in Table 1), the Windows XP commands that can be found in the applications menu. (10 marks)
Table 1.
S/N
Command
Function
Where it can be found/Location
b) Write a short note on the SQL SELECT statement. (5 marks)

4a) Ada supports three (3) different types of strings that are designed to solve different problems.
Analyse them illustrating with examples where necessary. (10½ marks)
b) Describe the three (3) constructors that can be used to create an instance of the FileInputStream class. (4½ marks)

5a) What are random access files in Java? (2 marks)
b) Enumerate the constructors used in creating an instance of the RandomAccessFile class in Java. (2 marks)
c) Outline four (4) methods of the RandomAccessFile class (6 marks)
d) Write a program in Java, using the WHILE loop to calculate the sum of the odd integers from 5 to 100. (5 marks)