Itse 1331: Introduction To Vb.net Ch. 1-3

Front 1

String Concatenation

Back 1

One string appended to another.

Ex. lblMessage.Text = "Good morning" & "Charlie"

Front 2

Line-continuation character

Back 2

A space followed by an underscore character; used to break a long programming statement into two or more lines.

Front 3

Focus

Back 3

The control that has the focus is the one that receives the user's keyboard input or mouse clicks.

Front 4

Focus method

Back 4

ControlName.Focus( )

*Where ControlName is the name of the control.

EX: txtDayOfTheWeek.Focus( )

Front 5

Tab Order

Back 5

The order in which controls receive the focus.

Front 6

TabIndex property

Back 6

Contains a numeric value, which indicates the control's position in the tab order.

Front 7

Access Key

Back 7

A key that is pressed in combination with the ALT key; access keys allow the user to access buttons and menu items using the keyboard; also known as a mnemonic.

Front 8

Mnemonic

Back 8

A key that is pressed in combination with the ALT key; access keys allow the user to access buttons and menu items using the keyboard; also known as a Access key.

Front 9

Accept Button

Back 9

A button on a form that is clicked when the user presses the ENTER key.

Front 10

Cancel Button

Back 10

A button on a form that is clicked when the user presses the ESC key.

Front 11

What TextBox property holds text entered by the user?

Back 11

Text

Front 12

Assume an application has a label named lblMessage and a TextBox control named txtInput. Write the statement that takes test the user entered into the TextBox control and assigns it to the label's Text property.

Back 12

lblMessage.Text = txtInput.Text

Front 13

If the following statement is executed, what will the lblGreeting control display?

lblGreeting.Text = "Hello " & "Jonathon, " & "how are you?"

Back 13

Hello Jonathon, how are you?

Front 14

What is the line-continuation character, and what does it do?

Back 14

It is actually two characters: a space followed by an underscore character. It allows you to break a long programming statement into two or more lines.

Front 15

What is meant when it is said that a control has the focus?

Back 15

The control is accepting keyboard and/or mouse input from the user.

Front 16

Write a statement that gives the focus to the txtLastName control.

Back 16

txtLastName.Focus( )

Front 17

What is meant by tab order?

Back 17

The order in which controls receive the focus when the user presses the TAB key.

Front 18

How does the TabIndex property affect the tab order?

Back 18

The TabIndex property, which contains numeric value, determines the position of a control in the tab order. The control that has the lowest TabIndex value (usually 0) on a form is the first in the tab order. The control with the next highest TabIndex (usually 1) will be the next in the tab order. This sequence continues.

Front 19

How does Visual Basic normally assign the tab order?

Back 19

In the order that controls are created.

Front 20

What happens when a control's TabStop property is set to False?

Back 20

That control is skipped in the tab order.

Front 21

Assume a button's Text property is set to the text Show &Map. What effect does the & character have?

Back 21

The & character has two different effects: It assigns an access key to the button (in this case, the access key is ALT+M because the & is in front of the M) and it causes the M to appear underlined on the button.

Front 22

What is an accept button? What is a cancel button? How do you establish these buttons on a form?

Back 22

An accept button is a form's button that is clicked when the user presses the ENTER key. A cancel button is a form's button that is clicked when the user presses the ESC key. You select accept and cancel buttons with the form's AcceptButton and CancelButton properties.

Front 23

Variable

Back 23

A storage location in computer memory that holds data while a program is running.

*It is called a variable because the data it holds can be changed by statements in the program.

Front 24

Code Outlining

Back 24

A Visual Studio tool that lets you expand and collapse sections of code.

Front 25

Naming Conventions

Back 25

Guidelines based on recommendations of professional designers, programmers, and educators.

*If you follow consistent naming convention, your program source code will be easier to read and understand.

Front 26

bln

Back 26

Boolean

Ex. blnContinue, blnHasRows

Front 27

byt

Back 27

Byte

Ex. bytInput, bytCharVal

Front 28

Chr

Back 28

Char

Ex. chrSelection, chrMiddleInitial

Front 29

dat or dtm

Back 29

Date, DateTime

Ex. datWeeklySalary, decGrossPay

Front 30

dec

Back 30

Decimal

Ex. decWeeklySalary, decGrossPay

Front 31

dbl

Back 31

Double

Ex. dblAirVelocity, dblPlanetMass

Front 32

int

Back 32

Integer

Ex. intCount, intDaysInPayPeriod

Front 33

lng

Back 33

Long

Ex. lngElapsedSeconds

Front 34

obj

Back 34

Object

Ex. objStudent, objPayroll

Front 35

shrt

Back 35

Short

Ex. shrtCount

Front 36

sng

Back 36

Single

Ex. sngTaxRate, sngGradeAverage

Front 37

str

Back 37

String

Ex. strLastName, strAddress

Front 38

Initialization

Back 38

Specifying an initial value for a variable.

Front 39

What is a variable?

Back 39

A variable is a storage location in the computer's memory; used for holding information while the program is running.

Front 40

Show an example of a variable declaration.

Back 40

Dim intCount As Integer

Front 41

Which of the following variable names are written with the convention used in this book?

decintrestrate
InterestRateDecimal
decInterestRate

Back 41

decInterestRate is written with the convention used in this book.

Front 42

Indicate whether each of the following is a legal variable name. If it is not, explain why.

count
rate*Pay
deposit.amount
down_payment

Back 42

count = Legal

rate*Pay = Illegal; cannot use the * character

deposit.amount = Illegal; cannot use a period

down_payment = Legal, however, the name does not follow the standard convention or using a prefix to indicate its data type.

Front 43

What default value is assigned to each of the following variables?

Integer
Single
Boolean
Byte
Date

Back 43

Integer = 0
Single = 0.0
Boolean = False
Byte = 0
Date = 12:00:00 AM, January 1 of year 1

Front 44

Write a Date literal for the following date and time: 5:35:00 PM on February 20, 2008.

Back 44

#2/20/2008 5:35 PM

Front 45

Which famous Microsoft programmer was launched into space in early 2007. Was this programmer connected in any way to Visual Basic?

Back 45

Charles Simonyi

Yes, he developed the Hungarian notation convention.

Front 46

Unary Operator

Back 46

Requires only a single operand

Ex. -5
-intCount

Front 47

Binary Operator

Back 47

Works with two operands

Ex. 5+10
intA +intB

Front 48

Name the following operators:

+
-
*
/
\
MOD
^

Back 48

Addition
Subtraction
Multiplication
Floating-point division
Integer division
Modulus (remainder from integer division)
Exponentiation (x^y = X to the power of Y)

Front 49

Now

Back 49

Returns the current date and time from system.

Front 50

TimeOfDay

Back 50

Returns the current time from the system, without the date.

Front 51

Today

Back 51

Returns the current date from the system, without the time.

Front 52

Scope

Back 52

refers to the part of a program where the variable is visible and may be accessed by programming statements.

Front 53

Combined Assignment Operators
(Compound Operators)

Back 53

Combine an arithmetic operator with an assignment operator.

Front 54

Precedence of the Arithmetic Operators

Back 54

-Exponentiation ( the ^ operator)
-Multiplication and division ( the * and / operators)
-Integer division (the \ Operator)
-Modulus (the MOD operator)
-Addition and subtraction (the + and - operators)

Front 55

What value will be stored in dbleResult after each of the following statements executes?

dblResult = 6 + 3 * 5
dblResult = 12 / 2 - 4
dblResult = 2 + 7 * 3
dblResult = (2 + 4) * 3
dblResult = 10 \ 3
dblResult = 6 ^ 2

Back 55

21
2
17
18
3.0
36

Front 56

What value will be stored in the int Result after each statement executes?

intResult = 10 MOD 3
intResult = 47 MOD 15

Back 56

1
2

Front 57

Write a statement that assigns the current time of day to the variable
dtmThisTime

Back 57

dtmThisTime = TimeOfDay

Front 58

Write a statement that assigns the current date and time to a variable named dtmCurrent

Back 58

dtmCurrent = Now

Front 59

Explain the meaning of the term scope when applied to variables.

Back 59

Scope defines the area of a program in which a variable or method is visible.

Front 60

What will be the final value of dblResult in the following sequence?
Dim dblResult As Double = 3.5
dblResult += 1.2

Back 60

dblResult = 4.7

Front 61

What will be the final value of dblResult in the following sequence?
Dim dblResult As Double = 3.5
dblResult *= 2.0

Back 61

dblResult = 7.0

Front 62

Implicit Type Conversion

Back 62

When you assign a value of one data type, Visual Basic attempts to convert the value being assigned to the data type of the variable.

Front 63

Widening Conversion

Back 63

A conversion in which no data is lost.

Front 64

Narrowing Conversion

Back 64

If you assign a real number to an integer variable, Visual Basic attempts to perform this conversion, which sometimes results in lost data.

Front 65

Option Strict

Back 65

In Visual Basic, a configuration option that determines whether certain implicit conversions are legal.

Front 66

Type:

Boolean

Back 66

Description:

Keywords True and False

Hint 66

Example:

True

Front 67

Type:

Byte

Back 67

Description:

Sequence of decimal digits between 0 and 255

Hint 67

Example:

200

Front 68

Type:

Char

Back 68

Description:

Single letter enclosed in double quotes followed by the lowercase letter C

Hint 68

Example:

"A"c

Front 69

Type:

Date

Back 69

Description:

Date and/or time representation enclosed in # symbols

Hint 69

Example:

#1/20/05 3:15 PM#

Front 70

Type:

Decimal

Back 70

Description:

Optional leading sign, sequence of decimal digits, optional decimal point and trailing digits, followed by the letter D or @

Hint 70

Example:

64@

Front 71

Type:

Double

Back 71

Description:

Optional leading sign, sequence of digits with a decimal point and trailing digits, followed by the optional letter R

Hint 71

Example:

3.5R

Front 72

Type:

Integer

Back 72

Description:

Optional leading sign, sequence of decimal digits, followed by the optional letter I

Hint 72

Example:

-3054I

Front 73

Type:

Long

Back 73

Description:

Optional leading sign, sequence of decimal digits, followed by the letter L

Hint 73

Example:

40000000L

Front 74

Type:

Short

Back 74

Description:

Optional leading sign, sequence of decimal digits, followed by the letter S

Hint 74

Example:

12345S

Front 75

Type:

Single

Back 75

Description:

Optional leading sign, sequence of digits with a decimal point and trailing digits, followed by the letter For !

Hint 75

Example:

26.4F
26.4!

Front 76

Type:

String

Back 76

Description:

Sequence of characters surrounded by double quotes

Hint 76

Example:

"ABC"
"234"

Front 77

Named Constant

Back 77

A variable whose content is read-only, and cannot be changed by a programming statement while the program is running.

Hint 77

Const ConstantName As DataType = Value

Ex. Const dblINTEREST_RATE As Double = 0.129

Front 78

Function

Back 78

A named, self-contained body of code, to which you send some input.

Front 79

CDate ( expr )

Back 79

Converts a String expression to a Date. Input can also be a Date literal, such as "10/14/2009 1:30PM"

Hint 79

Ex.
Dim datBirthday As Date = CDate (txtBirthday.Text)

Front 80

CDbl ( expr )

Back 80

Converts an expression to a Double. If the input expression is a String, a leading currency symbol ($) is permitted, as are commas. The decimal point is optional.

Hint 80

Ex.

Dim dblSalary As Double = CDbl (txtPayRate.txt)

Front 81

CDec ( expr )

Back 81

Converts an expression to an Integer. If the input expression is a string, a leading currency ($) is permitted, as are commas. The decimal point is optional, as are digits after the decimal point.

Hint 81

Ex.

Dim decPayRate As Decimal = CDec (txtPayRate.Text)

Front 82

CStr ( expr )

Back 82

Converts an expression to a String. Input can be a mathematical expression, Boolean value, a date, or any numeric data type.

Hint 82

Ex.
Dim dblPayRate As Double
Dim decPayRate As Decimal = CDec (dblPayRate)

Front 83

Exception

Back 83

An event or condition that happens unexpectedly and causes the application to halt.

Front 84

After the statement dblResult = 10 \3 executes, what value will be stored in dblResult?

Back 84

dblResult = 3.0

Front 85

After each of the following statements executes, what value will be stored in dblResult?

dblResult = 6 + 3 * 5
dblResult = 12 /2 - 4
dblResult = 2 + 7 * 3 - 6
dblResult = (2 + 4) * 3

Back 85

21
2
17
18

Front 86

What value will be stored in dblResult after the following statement executes?
dblResult = CInt ("28.5")

Back 86

dblResult = 28

Front 87

Will the following statement execute or cause a runtime error?
dblResult = CDbl ("186.478.39")

Back 87

dblResult = 186478.39

Front 88

What is a named constant?

Back 88

An identifier (like a variable) that is given a type and a constant value.

Front 89

Assuming that intNumber is an integer variable, what value will each of the following statements assign to it?
intNumber = 27
intNumber = Cint (12.8)
intNumber = CInt (12.0)
intNumber = (2 + 4) * 3

Back 89

27
12
58
13

Front 90

When does a type conversion runtime error occur? ( Assume Option Strict is Off)

Back 90

When the value being assigned cannot be converted to the type of the destination variable.

Front 91

Excluding the Val( ) function, which function converts the string "860.2" to value of type Double?

Back 91

CDBI Function

Front 92

How would the following strings be converted by the CDec function?

48.5000
$34.95
2,300
Twelve

Back 92

48 (Roundup to the nearest even integer)
25 (rounds up)
2300
**cannot be converted**