Deck 7: Sub and Function Procedures

Question 1

It is a common practice to begin a procedure's name with a(n)____.

A)noun
B)verb
C)adjective
D)adverb

Answer 1

B

Question 2

A(n)____ is processed only when it is called (invoked)from code.

A)dependent Sub procedure
B)independent Sub procedure
C)event procedure
D)independent event procedure

Answer 2

B

Question 3

Visual Basic allows you to specify that an argument in the Call statement is optional.

Answer 3

True

Question 4

You can determine whether a variable is being passed by value or by reference by looking at the Call statement.

Question 5

Which of the following is a valid header for a procedure that is passed the number 9.75?

A)Private Function CalcSubtotal(ByVal intPrice As Integer) As Decimal
B)Private Function CalcSubtotal(ByRef intPrice As Integer) As Decimal
C)Private Function CalcSubtotal(ByVal decPrice As Decimal) As Decimal
D)Private Function CalcSubtotal(ByVal intPrice As Integer)

Question 6

Math.Round(3.234,2)returns the number 3.24.

Question 7

An event procedure is a Function procedure that is associated with a specific object and event.

Question 8

The syntax of the Call statement is ____.

A)Call procedureName([argumentList])
B)Call procedureName{[parameterList]}
C)Call procedureName([argumentList], dataType)
D)Call procedureName([argumentList]) As dataType

Question 9

When using ____,you capitalize the first letter in the procedure name and the first letter of each subsequent word in the name.

A)sentence case
B)camel case
C)object case
D)Pascal case

Question 10

An independent Sub procedure is a procedure that is independent of any object and event.

Question 11

An independent Sub procedure can contain one or more ____ in its procedure header that have procedure scope and store an item of data.

A)events
B)variables
C)constraints
D)parameters

Question 12

The computer automatically processes an event procedure when the event occurs.

Question 13

When you pass a variable ____,the computer passes only the contents of the variable to the receiving procedure.

A)by reference
B)by parameter
C)by dataType
D)by value

Question 14

Like a Sub procedure header,a Function procedure header includes the As dataType section.

Question 15

The number of arguments listed in the Call statement's argumentList should agree with the number of parameters listed in the parameterList in the procedure header.

Question 16

A Function procedure does not return a value after performing its assigned task.

Question 17

In most cases,the last statement within a function is the ____ expression.

A)End Function
B)Return
C)As
D)Private

Question 18

The names of the arguments in a Call statement need to be identical to the names of the corresponding parameters.

Question 19

You pass a variable ____ when the receiving procedure needs to know the variable's contents,but the receiving procedure does not need to change the contents.

A)by reference
B)by parameter
C)by dataType
D)by value

Question 20

Which of the following is a valid header for a procedure that receives the address of a string variable and the address of an integer?

A)Private Sub GetInfo(ByRef strName As String, ByRef intAge As Integer)
B)Private Sub GetInfo(ByRef strName, ByRef intAge)
C)Private Sub GetInfo(ByVal strName As String, ByVal intAge As Integer)
D)Private Sub GetInfo(ByVal strName, ByVal intAge)

Question 21

A combo box's ____ property contains the value that appears in the text portion of the control.

A)Add
B)Sorted
C)Text
D)list

Question 22

To sort the items in the list portion of a combo box,you use the combo box's ____ property.

A)Sorted
B)Ascending
C)Descending
D)TabIndex

Question 23

The default combo box style in Visual Basic is ____.

A)Text
B)Simple
C)DropDown
D)DropDownList

Question 24

As you do with list boxes,you use the Items collection's ____ method to add an item to a combo box.

A)Insert
B)Add
C)New
D)Append

Question 25

____ styles of combo boxes are available in Visual Basic.

A)Two
B)Three
C)Four
D)Five

Question 26

Which of the following statements will determine the number of items in the list portion of the Department combo box?

A)cboDepartment.Count.Items
B)cboDepartment.Items.Count
C)lstDepartment.Items.Count
D)lstDepartment.Count.Items

Question 27

Which of the following is a valid Return statement?

A)dblNumber Return
B)Return dblNumber ByRef
C)Return ByRef dblNumber
D)Return dblNumber

Question 28

For the access key to work correctly in a combo box,you must set the label's TabIndex property to a value that is ____ the combo box's TabIndex value.

A)identical to
B)one less than
C)one more than
D)greater than or equal to

Question 29

An application calculates an ending inventory amount based on a beginning inventory amount,sales,and returns.You need to create a function to calculate the ending inventory using three passed Integer variables: intBegin,intSales,and intReturns.Which of the following procedure headers should be used?

A)Private Function GetEndInventory(ByVal intBegin, ByVal intSales, ByVal intReturns) As Integer
B)Private Function GetEndInventory(ByVal intBegin As Integer, ByVal intSales As Integer, ByVal intReturns As Integer)
C)Private Function GetEndInventory(ByVal intBegin As Integer, ByVal intSales As Integer, ByVal intReturns As Integer, ByRef intEnd As Integer) As Integer
D)Private Function GetEndInventory(ByVal intBegin As Integer, ByVal intSales As Integer, ByVal intReturns As Integer) As Integer

Question 30

Usually,the statement that invokes a function will assign the function's return value to a(n)____.

A)address
B)argument
C)variable
D)parameter

Question 31

The syntax ____ displays a return value.

A)dblNewPrice = GetNewPrice(dblCurrentPrice)
B)lblNewPrice.Text = GetNewPrice(dblCurrentPrice).ToString("C2")
C)Dim dblNewPrice
D)dblTotalDue = intQuantity * GetNewPrice(dblCurrentPrice)

Question 32

A form's ____ procedure is responsible for verifying that the user wants to close the application,and then taking the appropriate action based on the user's response.

A)Click event
B)FormClosing event
C)Add event
D)Button event

Question 33

Which of the following statements would invoke the GetEndInventory function and assign the function's return value to the intEnd variable?

A)Call GetEndInventory(intBegInv, intItemsSold, intReturned)
B)intEnd = Call GetEndInventory(intBegInv, intItemsSold, intReturned)
C)intEnd = GetEndInventory(intBegInv, intItemsSold, intReturned)
D)intEnd = GetEndInventory()

Question 34

In a ____ combo box,the text portion is not editable.

A)Text
B)Simple
C)DropDown
D)DropDownList

Question 35

If the digits argument is omitted,the Math.Round function returns a(n)____.

A)zero
B)exception
C)error
D)integer

Question 36

Like the first item in a list box,the first item in a combo box has an index of ____.

A)0
B)1
C)2
D)3

Question 37

The ____ keyword in a function header identifies the data type of the data being returned.

A)Is
B)DataType
C)As
D)Return

Question 38

The expression Math.Round(287.876,2)yields a value of ____.

A)287.87
B)287.88
C)288.00
D)290.00

Question 39

The syntax ____ assigns a return value to a variable.

A)dblNewPrice = GetNewPrice(dblCurrentPrice)
B)lblNewPrice.Text = GetNewPrice(dblCurrentPrice).ToString
C)Dim dblNewPrice
D)dblNewPrice = dblCurrentPrice

Question 40

A ____ is similar to a list box in that it allows the user to select from a list of choices.

A)text box
B)message box
C)combo box
D)dialog box

Question 41

When will the TextChanged event occur for a combo box? Which style allows the user to edit the text of the combo box?

Question 42

' calculate and return the miles per gallon
Private Function GetMPG(ByVal dblMiles,
ByVal dblGallons)As Double
Return dblMPG = dblMiles / dblGallons
End Sub
' call the function to calculate miles per gallon
' pass variables for the calculation
intMPG = GetMPG()

Question 43

Private Sub frmMain_FormClosing(ByVal sender As Object,ByVal e As System.Windows.Forms.FormClosingEventArgs)Handles Me.FormClosing
' verify that the user wants to exit the application
Dim dlgButton As DialogResult
dlgButton = MessageBox.Show("Do you want to exit?",
"Sample Program")
' if the No button was selected,don't close the form
If dlgButton = DialogResult.Yes Then
e.Cancel = TrueEnd IfEnd SubPrivate Sub frmMain_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load' fill combo box with values, then select default valueFor intNumber As Integer From 0 Thru 10cboNumbers.Add(intNumber.ToString)Next intNumbercboNumbers.SelectedItem = FirstEnd Sub

Question 44

Write the code to add Freshman,Sophomore,Junior,and Senior to the Class combo box.Use the SelectedItem property to make Freshman the default item.

Question 45

Write the code for a Sub procedure named InitializeVariables.The Sub procedure will assign the number 0 to the intTotalCars,intTotalTrucks,intTotalSUVs.Then write the code to call the procedure.

Question 46

What is a combo box? List the three styles of combo boxes available in Visual Basic.

Question 47

Write the code for a Sub procedure named CalculateBonus.The procedure receives three decimal variables representing the salary,bonus rate,and bonus amount.The procedure should calculate the bonus amount by multiplying the salary by the bonus rate.Create your own variable names.

Question 48

What are the three main reasons programmers use independent Sub procedures?

Question 49

What is the Math.Round function? Provide the function's syntax and define the arguments.

Question 50

An application needs to calculate sales tax for purchases.You decide to simplify the code by putting the sales tax calculation in a function.The returned value from the function is then added to the Subtotal,and the result is stored in the decTotal variable.Which of the following statements will call the GetSalesTax function and return a value to be used in the Total calculation?

A)decTotal = decSubtotal + GetSalesTax()
B)decSubtotal + GetSalesTax(decSubtotal)
C)decTotal = decSubtotal + GetSalesTax(decSubtotal)
D)decTotal = decSubtotal + GetSalesTax(decSubtotal As Decimal)

Question 51

How do the parameterList of a procedure header and the argumentList of a Call statement relate to each other?

Question 52

What is the difference between a Sub procedure and a Function procedure?

Question 53

Explain the difference between passing data by value and passing data by reference.

Question 54

Write the code for a Sub procedure named DisplayAuto,which displays a message containing the two values passed to it: an automobile make and model.Use strMake and strModel as the parameters.Display the "You own a make model." message in a message box.Then write the statement to invoke the procedure,passing it the contents of the strBrand and strType variables,respectively.

Question 55

An application uses a message box to ask users whether they want to exit the application,and the return value is stored in the dlgButton variable.Write the statement needed to stop the computer from closing the form if the user selects the No button in the message box.

Question 56

Write the code for a function named GetMajor.The function should prompt the user to enter a major field of study and then return the user's response.Then write a statement to invoke the GetMajor function,returning the result to the strCurrentMajor variable.

Question 57

An application allows a user to scan a bar code of an item to determine the item price.A message that contains the item name and the item price should display.You need to create a Sub procedure to display the message.Which of the following procedure headers should be used?

A)Private Sub DisplayMessage(ByVal strItem As String, ByVal decPrice As Decimal)
B)Private Function DisplayMessage(ByVal strItem As String, ByVal decPrice As Decimal)
C)Private Sub DisplayMessage(ByRef strItem As String, ByRef decPrice As Decimal)
D)Private Sub DisplayMessage(ByVal strItem As String, ByRef decPrice As Decimal)

Question 58

Which of the following statements would invoke the DisplayMessage Sub procedure?

A)Call DisplayMessage()
B)Call DisplayMessage(strItemName, decItemPrice)
C)DisplayMessage(strItemName, decItemPrice)
D)Call DisplayMessage(strItemName, decItemPrice) As String

Question 59

Write the code for a function named CalculateBonus.The function receives two decimal variables representing the salary and bonus rate.The function should calculate the bonus amount by multiplying the salary by the bonus rate,and then return the result.Then write the appropriate statement to invoke the function,passing it the decSalary and decRate variables.Assign the function's return value to the decBonus variable.

Question 60

Write the code for a Sub procedure named CalculateAverage that receives four decimal variables (the first three by value and the last one by reference).The procedure should use the first three variables to calculate the average and then store the result in the fourth variable.