Deck 3: Using Variables and Constants

Question 1

All numeric variables are automatically initialized to 0 if no initial value is specified when the variable is declared.

Answer 1

True

Question 2

A Boolean variable is initialized to the value True if no initial value is stated when the variable is declared.

Answer 2

False

Question 3

Spaces are allowed in variable names.

Answer 3

False

Question 4

Instead of storing data in the properties of various controls,programmers can create ____,which are memory locations inside the computer,to store data.

A)characters
B)variables
C)integers
D)strings

Question 5

Object and String variables are automatically initialized using ____.

A)spaces
B)the keyword Nothing (no data at all)
C)the word "Nothing"
D)0

Question 6

Every numeric data type in Visual Basic has a ____ method that can be used to convert a string to that numeric data type.

A)Convert
B)Format
C)TryParse
D)Number

Question 7

You can eliminate the problems that occur as a result of implicit type conversions by entering the Option Explicit On statement in the General Declarations section of the Code Editor window.

Question 8

Data types and classes are not related to each other.

Question 9

Which of the following statements declares a Double variable named dblAverage?

A)Dim dblAverage As Double
B)Dim As Double dblAverage
C)Const dblAverage As Constant
D)Dim dblAverage As Single

Question 10

Calculations involving Decimal variables are not subject to the small rounding errors that may occur when using Double or Single variables.

Question 11

The assignment operator in Visual Basic is the ____ symbol.

A)^
B)<
C)>
D)=

Question 12

A named constant's value cannot be changed while the application is running.

Question 13

A variable declared in the Declaration section of a form is called a procedure-level variable.

Question 14

You cannot associate a procedure with more than one object or event.

Question 15

A memory variable that is a Double data type requires ____ bytes of storage.

A)2
B)4
C)6
D)8

Question 16

Which of the following statements subtracts the contents of the intNum1 variable from the contents of the intNum2 variable,and then multiples the difference by 3? The result is assigned to the intResult variable.

A)intNum1 - intNum2 * 3 = intResult
B)(intNum2 - intNum1) * 3 = intResult
C)intResult = (intNum1 - intNum2) * 3
D)intResult = (intNum2 - intNum1) * 3

Question 17

A variable name must begin with a letter or a(n)____.

A)ampersand (&)
B)percent sign (%)
C)exclamation mark (!)
D)underscore (_)

Question 18

Which of the following can store a number containing a decimal place?

A)Single
B)Long
C)String
D)Integer

Question 19

The value returned by the InputBox function depends on the button the user chooses.

Question 20

Date variables are automatically set to which value when created?

A)1/1/1980 12:00:00 AM
B)1/1/2000 12:00:00 AM
C)1/1/0001 12:00:00 AM
D)1/1/0000 12:00:00 AM

Question 21

You declare a class-level variable using the ____ keyword.

A)Dim
B)Mod
C)Private
D)Static

Question 22

The ____ clause in an event procedure's header indicates the object and event associated with the procedure.

A)Handles
B)Private
C)Local
D)Associate

Question 23

You create a named constant using the ____ statement.

A)Fixed
B)Const
C)ConstantFixed
D)Perm

Question 24

The pet's temperature is recorded at every visit,and it may contain a decimal place.What data type is best for storing this data?

A)String
B)Integer
C)Decimal
D)Double

Question 25

A variable that was not assigned a specific data type is assigned the ____ data type.

A)Char
B)String
C)Boolean
D)Object

Question 26

When a button is selected,the computer processes the code contained in the button's ____ event procedure.

A)Submit
B)Press
C)On
D)Click

Question 27

Which of the following statements formats the contents of the dblPay variable with a dollar sign and no decimal places?

A)lblPay.Text = dblPay.ToString("C2")
B)lblPay.Text = dblPay.ToString(C0)
C)lblPay.Text = dblPay.ToCurrency("C0")
D)lblPay.Text = dblPay.ToString("C0")

Question 28

When using the Visual Basic 2015 InputBox function,which of the following is the Windows standard?

A)sentence capitalization for both the prompt and the title
B)book title capitalization for the title and sentence capitalization for the prompt
C)book title capitalization for both the prompt and the title
D)Pascal case for both the prompt and the title

Question 29

You use the ____ operator to concatenate strings together.

A)@
B)%
C)&
D)#

Question 30

A control's ____ event occurs when a change is made to the contents of a control's Text property.

A)CodeChanged
B)TextChanged
C)ChangedText
D)TextModified

Question 31

Which of the following statements declares a class-level variable?

A)Private Dim dblHeight As Double
B)Dim dblHeight As Double
C)Class dblHeight As Double
D)Private dblHeight As Double

Question 32

The strFirstName and strLastName variables contain the strings "Jane" and "Jones",respectively.Which of the following statements will display a string as "Jones,Jane" (the last name,a comma,a space,and the first name)in the lblFullName control?

A)lblFullName = strLastName, & strFirstName
B)lblFullName = strLastName & ", " strFirstName
C)lblFullName = strLastName & ", " & strFirstName
D)none of the above

Question 33

A form's CancelButton property specifies the button whose Click event procedure is processed when the user presses the ____ key.

A)Enter
B)Shift
C)Tab
D)Esc

Question 34

The line continuation character is a(n)____.

A)ampersand (&)
B)underscore (_)
C)equal sign (=)
D)pound sign (#)

Question 35

Specifying the number of decimal places and the special characters to display in a number is called ____.

A)formatting
B)concatenating
C)shredding
D)designing

Question 36

The data entered by the users is currently stored in properties of controls of the form.Your first task to improve the application is to ____.

A)declare variables for all of the input data
B)rename the controls
C)change the layout of the form
D)add a colorful logo to the form

Question 37

The ____ of a variable determines where in the application's code a variable can be used.

A)dimension
B)type
C)scope
D)extent

Question 38

The ControlChars.NewLine constant instructs the computer to ____.

A)advance the insertion point to the next line in a control
B)exit the routine and restart
C)restart from the beginning of the subroutine
D)strip the remainder of the routine

Question 39

If Option Strict is set to On,which of the following statements will assign the contents of the txtLateFee control to a Decimal variable named decLateFee?

A)TryParse.Decimal(txtLateFee.Text, decLateFee)
B)Decimal.TryParse(txtLateFee.Text, decLateFee)
C)decLateFee = Convert.ToDecimal(txtLateFee)
D)decLateFee = txtLateFee.Text

Question 40

A default button is identified by setting the form's ____ property.

A)AcceptButton
B)DefaultButton
C)SelectedButton
D)CancelButton

Question 41

A local gym needs an application to apply a 10% discount for all new members who present a coupon during enrollment.Write the statements to declare a variable to record if a customer has a coupon,and to assign the discount rate.The discount rate will not change while the application is running.

Question 42

Write a statement to display an input dialog box that shows "Car Make:" as the prompt,"Car" in the title bar,and an empty input area.When the user closes the dialog box,the assignment statement assigns the function's return value to the strCar variable.

Question 43

The decBalance variable contains the number 1368.52.Write the assignment statement to display the value with a dollar sign,a thousands separator,and two decimal places in the lblBalance control.

Question 44

A procedure in an application needs to store data used to calculate the total price of purchasing tires.The price of the tires will contain a decimal place.The number of tires will always be a whole number.Write the appropriate Dim statements to declare the variables.Make sure to use appropriate naming conventions.

Question 45

An application allows a user to enter an item price and a quantity to be used in a calculation.The item price may contain a decimal place,and the quantity will always be a whole number.Write the appropriate Dim statements to declare the variables.Write the related statements needed to convert the strings entered by the user into numeric data types.

Question 46

A procedure in an application needs to store student data.The student first name,student last name,student GPA,and whether or not the student is registered all need to be stored.Write the appropriate Dim statements to declare the variables.Make sure to use appropriate naming conventions.

Question 47

The account number for each pet must be available to be used by all procedures in the form.You should make sure the account number is declared using the ____ keyword.

A)Public
B)Dim
C)Private
D)Val

Question 48

What are the Convert class methods and why are they sometimes used instead of conversion functions?

Question 49

The veterinarian wants to document and display the name of the technician who performs the initial evaluation of the pet.You decide to use an InputBox function to prompt the user to enter this data first.The InputBox function should be coded in the ____.

A)Save button's Click event procedure
B)form's Load event procedure
C)Print button's Click event procedure
D)Exit button's Click event procedure

Question 50

What is a static variable? How is it different from a class-level variable?

Question 51

Explain the scope and lifetime of variables.How are a variable's scope and lifetime determined? List the three scopes available for a variable.

Question 52

To simplify the coding of the InputBox function,the prompt and the title for the InputBox can be declared as ____ because they will not change while the application runs.

A)string variables
B)static variables
C)Boolean variables
D)named constants

Question 53

A procedure in an application needs to store tax rate data.The county of residence and the tax rate need to be stored.Write the appropriate Dim statements to declare the variables.Write an assignment statement that assigns .08 to the tax rate variable.

Question 54

What is a TextChanged event? How can it be used within an application?

Question 55

An application allows a user to enter an employee code,a salary amount,and a bonus rate to be used in a calculation.The salary amount will always be a whole number,and the bonus rate may contain a decimal place.Write the appropriate Dim statements to declare the variables.Write the related statements needed to convert the strings entered by the user into numeric data types.

Question 56

The Decimal,Double,and Single variable data types can all store what type of numeric data? Explain the differences among these three data types and problems that can occur with their use.

Question 57

The decRate variable contains the number .03.Write the assignment statement to display the value as 3% in the lblRate control.

Question 58

Dim strPROMPT As String = "Please enter an employee code:"
Const strTITLE As String = Employee Data
'assign the code to a variable
strCode = InputBox(strTITLE,strPROMPT)

Question 59

Private Sub btnCalc_Click(ByVal sender As Object,ByVal e As System.EventArgs)Handles btnCalc.Click
' calculates and displays the total amount owed for purchasing hats
' user enters number of hats and price per hat
' all hats are on sale for 25% off the price
Dim dblNumHats As Integer
Dim decHatPrice As Decimal
Dim decDiscount As Double
Dim decTotal As Decimal
' assign number of hats and price to variables
Integer.TryPurse(txtNumHats.Text,intNumHats)
Decimal.TryParse(txtHatPrice,decHatPrice)
' calculate and display the total amount owed
decDiscount = decHatPrice * dblRATE
decTotal = (intNumHats + decHatPrice)- decDiscount
Total.Text = decTotal.ToString(C2)
End Sub

Question 60

An application translates English words into French words and displays the results as a message in a Label control.The strEnglish variable contains the string "apple".The strFrench variable contains the string "pomme".Write an assignment statement to display the string "The French word for apple is pomme." in the lblMessage control.