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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 2016 EXAMINATION
COURSE CODE: CIT 351
COURSE TITLE: C# Programming
DURATION: 2½ Hours
INSTRUCTIONS: Answer any Four (4) Questions
1a. State the general syntax for declaring a variable in C# 4 marks
1b. State the main role of each part of the syntax 4 marks
1c. Give the guiding principle for accomplishing the following:
- Grouping statements into one unit 2 marks
- Designing an end statement 2 marks
- Enhancing a source code legibility 2 marks
1d. Enumerate 4 most commonly used data types in C# programming 3 ½ marks
[Total = 17 ½ marks]
2a. Describe how memory leaks are handled in C# programming? 5 ½ marks
2b. Give a brief explanation of any 3 template types accessible in Visual C# projects 12 marks
[Total = 17 ½ marks]
3a What is the main significance of VisualStudio.NET with respect to having an Integrated Development Environment? 2 ½ marks
3b List 3 regular programming tasks carried out in VisualStudio.NET 6 marks
3c. What is the implication of using the Microsoft’s .NET Framework libraries when naming objects in C#? 4 marks
3d Spot 5 statements in the following source code specifying their corresponding roles.
IntsampleVariable;
sampleVariable = 5;
Method();
SampleClasssampleObject = newSampleClass();
sampleObject.ObjectMethod();
<//executing a “for” loop with an embedded “if” statement 5 marks
[Total = 17 ½ marks]
4a Give any four (4) reasons why statements are considered to be critical for C# program execution.
4b With the aid of two (2) common examples, explain why C# is said to be a case-sensitive programming language. 4 marks
4c Write down the corresponding C# alias of the following C# Primitive types:
- Int32 ½ marks
- Single 1 mark
- Int64 1 mark
- Double 2 mark
- Byte 1 mark
- Char 1 mark
- Decimal 1 mark
- SByte 1 mark
- UInt32 1 mark
9 ½ marks
[Total = 17 ½ marks]
5. Study the figure provided and answer the subsequent questions:
Using System;
public class Fib{
Decimal current;
Decimal last;
public Fib(){
current = 1;
last = 0;
}
private Fib(Decimal last, Decimal secondToLast){
current = last+secondToLast;
this.last = last;
}
public Fib GetNext(){
return new FiB(current.last);
}
public Decimal Value{
get{return current;}
}
}
5a. Identify and name the object within the source code. 3 marks
5b. Write the command line for compiling this object. 10 ½ marks
5c. Name any 2 operators in this source code. 4 marks
[Total = 17 ½ marks]
6a. Write down the source code for compiling a file named Economy.cs on the hard drive
of a computer. 6 ½ marks
6b. Provide the appropriate comment for the following:
- XML documentation
- Multiple line
- Single line 3 marks each
6c. What is the implication of declaring a Method as static? 2 marks
[Total = 17 ½ marks]
