Deck 3: Variables, Constants, and Calculations

Question 1

The Parse method and exception handling can be used to eliminate the problems encountered when the user does not enter a value into a field.

Answer 1

True

Question 2

Variables that are declared in the Declarations section of a form module are available to all procedures in the form.

Answer 2

True

Question 3

Numeric constants may contain only the digits ( 0 - 9 ),a decimal point,and a sign ( + or - )at the left side.

Answer 3

True

Question 4

Assume that a variable is declared in the Declarations section of a form and named TOTAL_PAY_Decimal.This variable,TOTAL_PAY_Decimal,will be visible to all procedures in that form even though the programmer did not follow the naming conventions in the textbook and name the variable TotalPayDecimal.

Question 5

It is a good idea to set Option Strict On,in the Visual Basic environment in order to detect misspelled variable names when the project is run.

Question 6

GrandTotalDecimal is a valid variable name.

Question 7

Data whose value may not be changed during the execution of a project is referred to as a constant.

Question 8

A constant contains data whose value may be changed during the execution of a project.

Question 9

A variable named SalesTotalDecimal that is declared in the CalculateButton_Click event procedure can be used in any procedure of the form.

Question 10

When Option Explicit is turned on,you can use any variable name without first declaring it.

Question 11

A numeric variable that is declared with the Dim statement in a local procedure is initialized to zero each time the procedure is called.

Question 12

Constants can store string or numeric values.

Question 13

A variable that will store totals and that will be available to all procedures in the form must be declared as a constant.

Question 14

SCHOOL_NAME_String is in the correct format for a constant that holds the name of your school.

Question 15

If you are declaring a variable that will be used in calculations,you may use the string data type.

Question 16

When naming a constant,you should use uppercase characters in the name with an underscore between the words and the data type at the end of the name.

Question 17

Although it is best to always declare the data type on a Dim statement,the data type is optional.

Question 18

When using the format specifier codes,you can specify the number of digits to appear to the right of the decimal point.

Question 19

Variables that are declared inside a procedure can be used as counters and accumulators.(Ignore Static variables. )

Question 20

Calculations may be performed with variables.

Question 21

Which of the following is NOT a rule for naming identifiers for constants?

A)Include the data type at the end of the identifier.
B)Everything in the identifier's name should be capitalized except the data type.
C)Identifiers for constants should begin with a prefix of Const.
D)Identifiers for constants should use an underscore between words.

Question 22

A _______ variable is declared inside a procedure.

A)namespace
B)module-level
C)local
D)block

Question 23

Message boxes can be used to notify the user if input data is not a reasonable value.

Question 24

The data type that is used for decimal fractions is _______.

A)Decimal
B)Short
C)Integer
D)Fraction

Question 25

Which of the following is NOT a rule for naming identifiers?

A)Identifiers for constants should use an underscore between words.
B)Identifiers should use periods to separate words.
C)Identifiers should list the data type at the end of the name.
D)Identifiers cannot contain embedded blanks.

Question 26

When you declare a variable or a named constant,Visual Basic reserves an area of memory and assigns it a name called a(n)_______.

A)identifier
B)identity
C)declaration
D)dimension

Question 27

Message boxes can contain buttons.

Question 28

The reserved Visual Basic word,Dim,is short for dimension,which means _______.

A)declaration
B)size
C)storage location
D)identifier

Question 29

Where should the statement: Dim CounterInteger As Integer appear if you plan to use CounterInteger in only one event procedure?

A)The Declarations section of the form
B)The Form_Load procedure
C)The event procedure where CounterInteger will be used
D)The Namespace Constants file

Question 30

Intrinsic constants are _______.

A)declared using the keyword Const
B)declared using the keyword Dim
C)placed in the Declarations section of a form
D)built into Visual Studio

Question 31

Which of the following is a valid statement that can be used to declare a local variable that will store whole numbers?

A)Dim IndexWhole as Whole
B)Dim IndexString as String
C)Dim IntegerIndex as Index
D)Dim IndexInteger as Integer

Question 32

Variables declared within a button's click-event are _____ variables.

A)local
B)module-level
C)namespace
D)private

Question 33

Which of the following does not follow the conventions for naming identifiers?

A)UnitsEnrolledDecimal
B)ZipCodeString
C)Amount.Due.Decimal
D)COUNTRY_OF_BIRTH_String

Question 34

If Option Strict is turned off and a declaration statement does not specify a data type,it will default to _______.

A)boolean
B)string
C)object
D)variable

Question 35

Which of the following is NOT a valid rule for naming identifiers?

A)Names may contain underscores.
B)Names may contain letters.
C)Names may contain digits.
D)Names may contain spaces.

Question 36

Which of the following is NOT a valid Visual Basic data type?

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

Question 37

Where should the statement: Const ACCOUNT_NUMBER_String As String = "A45" appear if you plan to use ACCOUNT_NUMBER_String in more than one procedure?

A)The Declarations section of the form
B)The Form_Load procedure
C)The event procedure where ACCOUNT_NUMBER_String will be used
D)The Namespace Constants file

Question 38

The length of identifiers is limited to _______.

A)1 to 8 characters
B)1 to 256 characters
C)1 to 4,000 characters
D)1 to 16,383 characters

Question 39

Declaration statements _______.

A)can only be written inside a procedure
B)are only allowed in the Declarations section of a form
C)give variables and constants names,and specify the type of data they will hold
D)are not needed for constants

Question 40

Which of the following is a valid statement that can be used to declare a local variable that will store fractions?

A)Dim IndexFraction As Fraction
B)Dim IndexString As String
C)Dim IndexDecimal As Decimal
D)Dim IndexInteger As Integer

Question 41

To trap or catch exceptions,use a _______ block and enclose any statement(s)that might cause an error.

A)With \ End With
B)Try \ Catch
C)For \ Next
D)TheException

Question 42

Using the order of precedence and the formula below,what is AnswerInteger if?: NumberOneInteger = 2,NumberTwoInteger = 12,NumberThreeInteger = 20,and NumberFourInteger = 6
AnswerInteger = NumberOneInteger * (NumberTwoInteger + NumberThreeInteger)- NumberFourInteger / NumberOneInteger

A)19
B)41
C)61
D)None of these

Question 43

If a procedure contains a Dim statement and NameString is assigned as the identifier,NameString can be used _______.

A)anywhere in the project
B)only in the procedure where the Dim statement is shown
C)anywhere in the project if the variable name is changed to NAME_String
D)only once in the procedure

Question 44

Which of the following is the correct code that will display the value in TotalSalesDecimal with a percent sign and 2 decimals?

A)TotalSalesDecimal(2)
B)TotalSalesPercent(2)
C)TotalSalesDecimal.ToString("P2")
D)TotalSalesDecimal.ToString(%2)

Question 45

A variable that is declared in the Declarations section of a form is a(n)_______.

A)module-level variable
B)local variable
C)block variable
D)general variable

Question 46

What will be the value of AnswerInteger after execution of the following line of code? Assume that NumberAInteger = 6,NumberBInteger = 4,NumberCInteger = 2
AnswerInteger = (NumberAInteger + NumberBInteger)* (NumberAInteger / NumberCInteger)

A)6
B)30
C)27
D)None of these

Question 47

Which of the following is NOT a valid method for parsing?

A)Integer.Parse
B)Decimal.Parse
C)Parse.String
D)All of these are valid

Question 48

MessageBox.Show("Hello","Goodbye")will display _______.

A)"Hello" in the message box titlebar and "Goodbye" in the body of the message box
B)"Goodbye" in the body of the message box;"Hello" in the project's title bar
C)"Goodbye" in the message box titlebar and "Hello" in the body of the message box
D)None of these

Question 49

You can use the _______method to round decimal values to the desired number of decimal positions.

A)ToDecimal
B)ToSingle
C)ToRound
D)Round

Question 50

The Visual Basic statement that requires all variables to be declared is _______.

A)Dim
B)Option Strict On
C)Option Explicit On
D)Declarations

Question 51

What will be the value of TotalInteger after execution of this statement? Assume that ValueInteger = 2.
TotalInteger = ((ValueInteger + 2)* (ValueInteger + 4))/ ValueInteger + 1

A)13
B)8
C)12
D)None of these

Question 52

What statement should be used to declare a variable that is accessible from all procedures of a form?

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

Question 53

What will be the value of AnswerInteger after execution of these statements? Const NumberAInteger as Integer = 6
Const NumberBInteger as Integer = 4
Const NumberCInteger as Integer = 2
AnswerInteger = NumberAInteger + NumberBInteger * NumberCInteger

A)6
B)14
C)20
D)48

Question 54

Explain how you would decide which data type to use when declaring variables and constants.

Question 55

In order to control the number of decimals that will appear when a number is displayed,you can use _______.

A)a conversion function
B)a string variable
C)a constant
D)the format specifier codes

Question 56

Which of the following has the highest order of precedence in arithmetic expressions?

A)Multiplication and division
B)Addition and subtraction
C)Exponentiation
D)Operators are not significant;all calculations are evaluated from left to right.

Question 57

Integer.Parse is used to _______.

A)convert data in a textbox to a numeric value with no decimal places
B)properly align decimal positions in a numeric value
C)add a dollar sign ($)to improve the way the output looks
D)convert data in a textbox to a numeric value with 2 decimal places

Question 58

Write code using nested Try/Catch blocks where you will store data from text boxes named QuantityTextBox and PriceTextBox into variables named QuantityInteger and PriceDecimal.Handle any exceptions by displaying a message in a message box if the text boxes do not contain valid data.