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NATIONAL UNIVERSITY OF SCIENCE AND TECHNOLOGY
FACULTY OF APPLIED SCIENCE
AUGUST EXAMINATIONS 2009

SUBJECT:
CODE:

VISUAL PROGRAMING CONCEPTS AND DEVELOPMENT
SCS 1206

INSTRUCTIONS TO CANDIDATES
Answer all questions from section A and any 2 from section B. Each question carries 25 marks
3HOURS
SECTION A
QUESTION ONE
a)

Explain any four advantages of using Visual Programming as compared to Commandline Programming for application development.
[8]
b)
With the aid of examples explain the following types of programming errors; i) Logic errors,
ii) Syntax errors.
iii) Run-time errors.
c)

[2]
[2]
[2]

Define the following terms as used in Visual Programming
i.
User Interface
ii.
Label
iii.
Textbox
iv.
Checkbox
v.
Form

[10]

QUESTION TWO

Enter Word
Reverse

Palindrome

Write a program that implements the interface shown above and should be able to perform the following functions:

When the Reverse button is clicked, a word that the user inputs in the TextBox is reversed.When the Palindrome button is clicked, the program states wether the word that the user inputs in the TextBox is a palindrome or not.

[25]

SECTION B

QUESTION THREE
a)

Explain the following terms used in object models:
i. Inheritance
ii. Generalization
iii. Composition
iv. Polymorphism
v. Aggregation

[10]

b)

Explain what is meant by “VB.NET implements single inheritance”

[3]

c)

Write code snippet of two classes showing the concept of inheritence, use UML diagrams to express yourself.
[12]

QUESTION FOUR
a)

b)

Define the following terms;
i)
Control
ii)
Object
iii)
Property
iv)
Event Procedure
v)
Method

[10]

Write a VB.NET program that reads the contents of an input file and displays them on the console. The file name is to be specified by the user through the Input Box.
[15]

2

QUESTION FIVE
a)

What are the advantages and disadvantages of using the Implicit declaration as compared...
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