Bis 311 final examination answers

1. BIS 311 FINAL EXAMINATION ANSWERS
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BIS 311 Final Examination Answers
Question 1.1. (TCO 1) In the systems development life cycle, the goalof the design activity is
to _____. (Points : 5)
determine exactly what a new or modified information system should do
create a set of detailed plans or blueprints for the system
build the application
ensure that the application works as desired
Question 2.2. (TCO 2) To plan the code for a procedure, _____ uses standardized symbols to
show the steps the procedure must follow to reach its goal. (Points : 5)
pseudocode
a TOE chart
a class diagram
a flowchart
Question 3.3. (TCO 3) Computer memory locations where programmers can temporarily store
and change data while an application is running are _____. (Points : 5)
classes
literals

2. constants
variables
Question 4.4. (TCO 3) In Visual Basic, which of the following correctly declares a named
constant with the name strCOURSE that contains the string value “BIS311”? (Points : 5)
Const strCOURSE As String = “BIS311”
String Constant strCOURSE = “BIS311”
Dim strCOURSE As “BIS311”
Const String “BIS311” As strCOURSE
Question 5.5. (TCO 5) A _____ structure is used in an application when a decision needs to be
made, followed by an action derived from that decision. (Points : 5)
selection
sequence
repetition
interrogative
Question 6.6. (TCO 5) If intQty contains 60, what will be the value of intPrice after executing
the following code?
Select Case intQty
Case 1 To 50
intPrice = 10
Case 51 To 100
intPrice = 8
Case > 100
intPrice = 6
Case Else

3. intPrice = 0
End Select (Points : 5)
10
8
6
0
Question 7.7. (TCO 6) The loop below is classified as a(n) _____ loop.
Dim intNum As Integer = 2
Do
MsgBox( intNum.ToString() )
intNum *= intNum
Loop While intNum < 1000 (Points : 5)
infinite
pretest
posttest
counter-controlled
Question 8.8. (TCO 6) Which element of the following array contains the value “Red”?
Dim strColors() As String = {“Red”, “Green”, “Blue”, “Yellow”} (Points : 5)
strColors(4)
strColors(3)
strColors(1)
strColors(0)

4. Question 9.9. (TCO 7) The _____ of an independent Sub procedure usually begins with the
Private keyword. (Points : 5)
Call statement
argument list
procedure footer
procedure header
Question 10.10. (TCO 7) In the following function, what should go in the blank in the function
header?
Private Function GetRatio(dblNumerator As Double, dblDenominator As Double) _____
Dim dblRatio As Double
dblRatio = dblNumerator/dblDenominator
Return dblRatio
End Function (Points : 5)
ByVal
ByRef
As Integer
As Double
Question 11.11. (TCO 2) An application for a shipping company needs to keep track of the
length, width, height, and weight of packages. Using object-oriented programming methods,
in this application, the weight of a package would be represented by a(n) _____. (Points : 5)
object
attribute
method
class

5. Question 12.12. (TCO 4) (TCO 4) Consider the following class definition:
Public Class Box
Public Length As Double
Public Width As Double
Public Height As Double
Public Function GetVolume() As Double
Return Length * Width * Height
End Function
End Class
If crate is an instance of Box, which of the following statements assigns a value to a
property? (Points : 5)
crate.Length = 42
dblVolume = crate.GetVolume()
crate.GetVolume(42)
Call crate.Length(42)
Question 13.13. (TCO 8) A programmer makes a connection between a Visual Basic
application and a database using the _____. (Points : 5)
Database Integration tool
data box control
Data Source Configuration Wizard
Dataset Designer
Question 14.14. (TCO 9) The components of a two-tier architecture are _____. (Points : 5)
the primary and the secondary
the client and the server
the master and the subordinate

6. the alpha and the beta
Page 2
Question 1. 1. (TCOs 1, 2, and 3) You have been asked to develop an application with the
following business requirements: The user will enter an original price. When the user clicks a
Calculate Sale Price button, the application will calculate a sale price by multiplying the
original price by 80%. The application will display the sale price to the user.
(a) Develop a TOE chart for this application. You do not need to put it in table form, but list
what would go in the Task column, what would go in the Object column, and what would go
in the Event column for each row of the chart. Your chart should have at least three rows: one
for input, one for processing, and one for output.
(b) Write pseudocode for the button-click event procedure in this application.
(c) Identify two variables and one constant that you would declare for this application. For
each, provide a variable or constant name that follows the syntax rules of Visual Basic and
the Hungarian naming convention, and an appropriate Visual Basic data type. (Points : 30)
Spellchecker
Question 2. 2. (TCO 5) Consider the following Visual Basic code snippet:
If intScore >= 100 Then
lblMessage.Text = “Great job!”
Else
lblMessage.Text = “Better luck next time”
End If
(a) What type of control structure is this? Be as specific as possible, and justify your answer.
(b) Describe step by step how this code will be executed and what will be displayed to the
user for each of the following values of intScore: 99, 100, and 101.

7. (c) Rewrite this code snippet so that it still produces the same results, but changing the
condition in the first line from intScore >= 100 to intScore < 100. (Points : 30)
Spellchecker
(a) What type of control structure is this? Be as specific as possible, and justify your answer.
The control structure is an if statement that returns a message based on the value of the variable
intScore.
(b) Describe step by step how this code will be executed and what will be displayed to the user for
each of the following values of intScore: 99, 100, and 101.
For 99, the message displayed on the screen will be “Better luck next time” because 99 is less than
100.
For 100, the message will be “Great job” as the value is included in the scoop on the variable
intScore. i.e. 100 =100 evaluates to true.
For 101, the message will be “Great job” as the value is included in the scoop on the variable
intScore. i.e 101 >100 evaluates to true.
(c) Rewrite this code snippet so that it still produces the same results, but changing the condition in
the first line from intScore >= 100 to intScore < 100. (Points : 30)
Question 3. 3. (TCO 6) Consider the following code snippet:
Dim intTotal As Integer = 0
For intNum As Integer = 1 To 5
intTotal += intNum
Next intNum
MessageBox.Show( intTotal.ToString() )
(a) What type of control structure is this? Be as specific as possible, and explain your
answer.
(b) Identify the counter variable and the accumulator variable in this loop. Explain your
answer.

8. (c) Describe step by step how this code will be executed and what value will be displayed in a
message box to the user. (Points : 30)
Spellchecker
(a) What type of control structure is this? Be as specific as possible, and explain your answer.
The control structure is a “for” loop that controls the execution of the condition and incrementing the
intNum variable by 1, until the value 5 is reached.
(b) Identify the counter variable and the accumulator variable in this loop. Explain your answer.
The counter variable is intNum as it is increased by one within the loop and used to control the loop
while the accumulator variable is intTotal because it stores the incremented value.
(c) Describe step by step how this code will be executed and what value will be displayed in a
message box to the user. (Points: 30)
The variable intTotal is initialised to 0, then the counter variable (intNum) is increased by one at each
step until it obtains a value 5, then the loop stops. The message displayed on the screen will be: 0 1
2 3 4 5.
Question 1. 1. (TCO 7) (a) Explain the difference between passing by value and passing by
reference when passing variables to a Sub procedure or function.
(b) Describe a specific example of using a Sub procedure when you would pass a variable by
value.
(c) Describe a specific example of using a Sub procedure when you would pass a variable b y
reference. (Points : 30)
Spellchecker
(a) Explain the difference between passing by value and passing by reference when passing
variables to a Sub procedure or function.
Passing by value refers to a method of referencing variables by initialising them to real values while
passing by reference is a reference method that involves assigning values to functions through other
variables.
(b) Describe a specific example of using a Sub procedure when you would pass a variable by value.

9. Function sum {
Result=12 ;}
(c) Describe a specific example of using a Sub procedure when you would pass a variable by
reference. (Points : 30)
Function sum {
a=10, b=12;
Sum=a+b ;}
Question 2. 2. (TCOs 2 and 4) You have been asked to develop an application to keep track of
employees’ scheduled vacations and ensure that all vacations are approved by the manager
and that each employee does not exceed his or her maximum annual vacation time. Maximum
annual vacation time is determined by the number of years the employee has worked for the
firm. You are using object-oriented programming (OOP) to develop this application.
(a) Describe at least two classes that you could use in this application and what each class
would represent in the real world.
(b) Describe at least two properties of each class you identified in part (a) and identify the
data type you would use for each property.
(c) Describe at least one method of each class you identified in part (a), giving for each the
method name and the action performed by the method. (Points : 30)
Spellchecker
(a) Describe at least two classes that you could use in this application and what each class would
represent in the real world.
(b) Describe at least two properties of each class you identified in part (a) and identify the data type
you would use for each property.
(c) Describe at least one method of each class you identified in part (a), giving for each the method
name and the action performed by the method. (Points : 30)

10. Question 3. 3. (TCOs 8, 9, and 10) (a) Explain the roles of primary and foreign keys in a
relational database.
(b) In a two-tier architecture with a thin client and fat server, describe the functions performed
by the client and by the server in processing a request by a user for information from a
database.
(c) In a Visual Basic application that retrieves data from a database, describe the role of a
TableAdapter object. (Points : 30)
Spellchecker
(a) Explain the roles of primary and foreign keys in a relational database.
(b) In a two-tier architecture with a thin client and fat server, describe the functions performed by the
client and by the server in processing a request by a user for information from a database.
.
(c) In a Visual Basic application that retrieves data from a database, describe the role of a
TableAdapter object. (Points : 30)