Deck 3: Variables, Input, and Output

Question 1

Which of the following is a valid name for a variable?

A) Two_One
B) 2One
C) Two One
D) Two.One

Answer 1

A

Question 2

Which of the numbers below is equivalent to 0.000017489?

A) 1.7489E+05
B) 17489E+06
C) 1.7489E-06
D) 1.7489E-05

Answer 2

D

Question 3

What is the value of Int(8.9)?

A) 8
B) 8.9
C) 9
D) 1

Answer 3

A

Question 4

What is the correct statement when declaring and assigning the value of 100 to an Integer variable called numPeople?

A) Dim numPeople = 100
B) Dim numPeople = Int(100)
C) numPeople = 100
D) Dim numPeople As Integer = 100

Question 5

Which of the following statements removes all text from lstBox?

A) lstBox.Clear
B) lstBox.Items.Clear
C) lstBox.Text.Clear
D) lstBox.Items.Add("")

Question 6

What will be displayed when the following lines are executed? Dim $x$ As Double $= 3 , y$ As Double $= 1$
Dim z As Double
$\begin{array} { l } \mathrm { z } = \mathrm { x } + ( \mathrm { y } \star \mathrm { x } ) \\\mathrm { x } = \mathrm { y } \\\mathrm { z } = \mathrm { x } + \mathrm { z }\end{array}$
lstBox. Items. Add $( x + y + z )$

A) 4
B) 9
C) 10
D) None of the above

Question 7

Which of the following statements declare the variables a and b as type Integer?

A) a = 0: b = 0
B) Dim a, b
C) Dim a & b As Integer
D) Dim a, b As Integer

Question 8

The function Math.Int will always round mixed numbers down to the next lowest integer.

Question 9

The type of error that is normally spotted by the Code Editor is:

A) runtime
B) logic
C) syntax
D) user

Question 10

What value will be assigned to the numeric variable x when the following statement is executed? x = 2 + 3 * 4

A) 20
B) 14
C) 92
D) 234

Question 11

Which of the following arithmetic operations has the highest level of precedence?

A) +-
B) */
C) ^
D) ( )

Question 12

When declaring a variable that will refer to a submarine, a good name for the variable is sub.

Question 13

Given x = 3 and y = 1, what value will be assigned to the Double variable w when the following statement is executed?
w = (x + y) / (x - y)

A) 1
B) 2
C) 3
D) None of the above

Question 14

Keywords in Visual Basic are words that

A) should be used when naming variables.
B) are used to name controls, such as TextBox1, Command2, etc.
C) have special meaning and should not be used when naming variables.
D) are used as prefixes for control names (such as txt, btn, lbl, and lst).

Question 15

Assume that x, y, and temp are Integer variables. Which of the following lines of code swaps the values of x and y?

A) x = y
y = x
B) x = temp
x = y
y = temp
C) temp = x
x = y
y = temp
D) x = y temp = x y =
temp

Question 16

Suppose the Double variable num has the value 123.4567. What value will the following statement assign to num?
num = Math.Round(num, 2)

A) 123.4567
B) 123.457
C) 123.45
D) 123.46

Question 17

What will be the contents of the variable x after the following statement is executed? x = Math.Sqrt(((9 + 7) / (4 * 2)) + 2)

A) 1
B) 2
C) 3
D) 4
E) None of the above

Question 18

When using the equal sign to assign values, the variable on the left hand side of the equal sign will always receive the value.

Question 19

The variables firstName and firstNAME are identical.

Question 20

Which of the following is the same as 2 ^ 3?

A) 2 * 2 * 2
B) 2 * 3
C) 2 + 2 + 2
D) 3 * 3

Question 21

The value of (11 Mod 2) is 1.

Question 22

The following statement is valid.
y = y + 72

Question 23

Which of the following statements will NOT display the number 5 in the text box?

A) txtBox.Text = 5
B) txtBox.Text = "5"
C) txtBox.Text = CStr("5")
D) txtBox.Text = CStr(5)

Question 24

The following statement assigns 6 times the value of y to x.
x = 6y

Question 25

The exponential notation used in Visual Basic is exactly the same as standard mathematical notation.

Question 26

Which statement will display the words "Hello World" in a text box?

A) txtBox.Text = Hello & World
B) txtBox.Text = "Hello " & World
C) txtBox.Text = Hello & " World"
D) txtBox.Text = "Hello" & " World"

Question 27

The statement a + b = c assigns to c the sum of the values of a and b.

Question 28

You can use a variable name in almost any place you could use a literal value.

Question 29

An assignment statement is used to assign a value to a variable or property.

Question 30

The lstBox.Items.Clear statement is used to empty the contents of a list box.

Question 31

Numeric variables can be initialized to zero or any other number, but once they are initialized, they cannot be changed.

Question 32

Which of the following statements is a valid assignment statement?

A) txtBox = "Hello World"
B) "Hello World" = txtBox.Text
C) txtBox.Text = "Hello World"
D) Text.txtBox = "Hello World"

Question 33

The following two statements are equivalent, where numVar is a numeric variable.
numVar = numVar + 1
numVar += 1

Question 34

The value of (11 \ 2) is 1.

Question 35

Visual Basic always displays numbers in decimal format.

Question 36

What is the correct syntax for displaying the value of the String variable myString in a text box?

A) txtBox.Text = "myString"
B) txtBox.Text = myString
C) txtBox.Text.myString
D) txtBox.Text = Str(myString)

Question 37

Which of the following code statements generates an error?

A) txtFirst.Text = "Hello"
B) txtFirst.Text = Hello
C) txtFirst.Text = "My Text"
D) txtFirst.Text = Me.Text

Question 38

The following two statements are equivalent.
var1 = var2
var2 = var1

Question 39

A numeric variable that has not been assigned a value has the default value zero.

Question 40

The following statement is valid.
Dim x As Double = 3,542.36

Question 41

What is the value of ("12/15/09").Substring(3,2)?

A) /15
B) 15
C) /15/
D) 12/15/09

Question 42

The following statement contains what type of error?
txtAverage.Txt = CStr(CDbl(txtNum1.Text) + CDbl(txtNum2.Text) / 2)

A) a syntax error only
B) a logic error only
C) both a syntax error and a logic error
D) no errors

Question 43

The joining of two strings together to form a new string is called

A) concatenation.
B) addition.
C) compaction.
D) substrings.

Question 44

What will be the output of the following statement?
txtBox.Text = CStr(Math.Round(17 / 2))

A) 8
B) 9
C) 8.5
D) 17.00

Question 45

What will be displayed when the following lines are executed?
Dim x As Double = 2
'x = 3
txtBox.Text = CStr(x)

A) 3
B) 0
C) 2
D) None of the above

Question 46

Which of the following expressions will yield the string "John Doe", where name1 = "John Blake" and name2 = "Janet Doe"?

A) name1.Substring(0, 4) & name2.Substring(6, 8)
B) name1.Substring(0, 4) & name2.Substring(0, 3)
C) name1.Substring(0, 5) & name2.Substring(6, 3)
D) None of the above

Question 47

What character is used to signify the beginning of a comment statement?

A) asterisk
B) exclamation mark
C) apostrophe
D) backslash

Question 48

The symbol for the string concatenation operator is

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

Question 49

Which of the following expressions has as its value the value of strVar with its leading and trailing spaces removed?

A) strVar.Length
B) strVar.ToUpper
C) strVar.Ctrim
D) strVar.Trim

Question 50

What will be displayed when the following lines are executed?Dim $a , b$ , c As String
a = "THE WHOLE"
$\mathbf { b } =$ "PART"
$c = a$ . Substring (CInt (Math.Sqrt (4)), b. Length)
txtBox. Text $=$ cStr $( c )$
(A) THE WHOLE PART
(B) 6
(C) $\mathrm { E }$ ?H (D) $\mathrm { HE }$ W

A) THE WHOLE PART
B) 6
C) E WH
D) HE W

Question 51

What will be the value of numVar when the following code is executed? Dim strVar As String, numVar As Integer
strvar $=$ "Now is the time for all good men"
numVar $=$ strVar. Indexof ("the time for")

A) "Now is all good men"
B) "12"
C) 7
D) 8

Question 52

Which statement can be used to clear the contents of a text box?

A) txtBox.Empty = True
B) txtBox = ""
C) txtBox.Text = ""
D) txtBox.Wipe

Question 53

The following lines are valid.
Dim h As String = "Hello"
txtBox.Text = CStr(h.IndexOf("h"))

Question 54

All comment statements must be placed at the beginning of a program.

Question 55

Given the data assigned to the string variable str2 shown below, which of the following statements will assign the value ALL to the string variable str1?
str2 = "WHEN ALL ELSE FAILS, READ THE DIRECTIONS"

A) str1 = str2.Substring(5)
B) str1 = str2.Indestr1OfStr("ALL")
C) str1 = str2.Substring(6, 3)
D) str1 = str2.Substring(5, 3)

Question 56

The statement lstBox.Items.Add("") clears all the text from the list box.

Question 57

What will be the output of the following lines? Dim alphabet, soup As string
alphabet - "abcdefghijklmnopqrstuvwxyz"
soup = alphabet. ToUpper
txtBox.Text - alphabet.Substring $( 0,5 ) \&$ soup. Sabstring $( 0,5 )$

A) abcdeABCDE
B) ABCDEABCDE
C) eE
D) EE

Question 58

What will be the output of the following line?
txtBox.Text = "2" & 3

A) 23
B) 2 3
C) 5
D) Syntax error

Question 59

The value of strVar.Length is the number of characters in the value of strVar.

Question 60

If strVar.Length is 5, then the value of
strVar.Substring(4, 1)
is the last character of the
value of strVar.

Question 61

The statement txtBox = "Hello" is an example of a syntax error.

Question 62

A variable declared inside an event procedure cannot have the same name as a variable declared inside another procedure.

Question 63

A statement of the form dblVar = intVar is a narrowing assignment statement.

Question 64

With Option Strict On, a statement of the form intVar = dblVar is not valid.

Question 65

A variable declared inside an event procedure is said to have local scope.

Question 66

A string literal is a sequence of characters that is treated as a single entity.

Question 67

The following statements assign the lowercase letters to the string variable alphabet.
Dim alphabet As String
alphabet = abcdefghijklmnopqrstuvwxyz

Question 68

The Substring method is used to extract a portion of a string.

Question 69

What is the proper syntax when using a message dialog box?

A) MessageBox.Show("Hi there", "Hi")
B) MessageBox.Show(Hi there, Hi)
C) MessageBox.Show "Hi There", "Hi"
D) MessageBox.Show Hi There, Hi

Question 70

The following statement is valid where dog and cat are variables of the same type.
dog = cat

Question 71

Option Explicit requires you to declare every variable before its use.

Question 72

The Trim method is used to remove all blank space before and after a string.

Question 73

When a variable declared in one event procedure has the same name as a variable declared in another event procedure, any change to the value of one of the variables will affect the value of the other variable.

Question 74

Typecasting is used to convert a value to a different data type.

Question 75

A variable declared outside of an event procedure is said to have class-level scope.

Question 76

When declaring a variable of type String, you must specify a length for the string.

Question 77

After the statement txtBox.Text = "" is executed, the text box will be clear and the cursor will appear inside the text box.

Question 78

An assignment statement of the form intVar = 8 / 4 is not valid.

Question 79

The empty string is the same as a string that contains one space.

Question 80

Which of the following is not used to assign a value to a variable?

A) InputBox statement
B) Dim statement
C) an assignment statement
D) MessageBox.Show statement