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 goal of 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

       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

                        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)

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

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

       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.

(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.

(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 by 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.

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)

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)