Deck 5: Loops, Files, and Random Numbers

Question 1

The decrement operator is ____________.

A) +=
B) --
C) -=
D) ++

Answer 1

B

Question 2

The ____________ is specifically designed for situations requiring a counter variable to control the number of times that a loop iterates.

A) while loop
B) if-else statement
C) for loop
D) switch statement

Answer 2

C

Question 3

Each time the loop executes its statement or statements, we say the loop is iterating, or performing a(n) ____________.

A) cycle
B) pass
C) execution
D) iteration

Answer 3

D

Question 4

____________ are commonly used to control the number of times that a loop iterates.

A) Boolean variables
B) Sentinel variables
C) Counter variables
D) Named constants

Question 5

The ____________ begins with the word while, followed by a Boolean expression that is enclosed in parentheses.

A) conditional statement
B) logic mark
C) while clause
D) loop parameter

Question 6

To ____________ a variable means to increase its value.

A) append
B) decrement
C) add
D) increment

Question 7

The third expression that appears in the loop header of the for loop is the ____________, which executes at the end of each iteration, and it is typically the statement that increments the loop's counter variable.

A) test expression
B) update expression
C) initialization expression
D) increment expression

Question 8

The first expression that appears in the loop header of the for loop is the ____________, which is normally used to initialize a counter variable to its starting value.

A) update expression
B) test expression
C) Boolean expression
D) Initialization expression

Question 9

ListBox controls have an ____________ method that erases all the items in the Items property.

A) Items.Erase
B) Items.Remove
C) Items.Clear
D) Items.Reset

Question 10

Because the for loop tests its Boolean expression before it performs an iteration, it is a ____________.

A) pretest loop
B) pseudo loop
C) posttest loop
D) infinite loop

Question 11

The statement or block of statements following the while clause is known as the ____________ of the loop.

A) assembly
B) body
C) definition
D) sequence structure

Question 12

When the ++ and -- operators are written after their operands it is called ____________.

A) prefix mode
B) suffix mode
C) appendix mode
D) postfix mode

Question 13

ListBox controls have an ____________ property that reports the number of items stored in the ListBox.

A) Items.Count
B) Items.Size
C) Items.List
D) Items.Contains

Question 14

To ____________ a variable means to decrease its value.

A) subtract
B) increment
C) decrement
D) supplement

Question 15

The ++ and -- operators can be written before their operands, which is called ____________.

A) preface mode
B) postfix mode
C) prefix mode
D) superscript mode

Question 16

The while loop is known as a ____________, which means it tests its condition before performing an iteration.

A) posttest loop
B) pretest loop
C) proactive loop
D) preemptive loop

Question 17

If a loop does not have a way of stopping, it is called a(n) ____________.

A) runaway loop
B) game loop
C) infinite loop
D) expressionless loop

Question 18

To add an item to a ListBox control with code, you call the control's ____________method.

A) Add.Items
B) Items.Add
C) Items.Append
D) Items.Insert

Question 19

The increment operator is ____________.

A) --
B) ++
C) -=
D) +=

Question 20

The second expression that appears in the loop header of the for loop is the _____________, which is a Boolean expression that controls the execution of the loop.

A) test expression
B) update expression
C) initialization expression
D) control expression

Question 21

The ____________ is a posttest loop, which means it performs an iteration before testing its Boolean expression.

A) for loop
B) while loop
C) do-while loop
D) do-before loop

Question 22

A ____________ is an invisible character that specifies the end of a line of text.

A) line feed character
B) newline character
C) carriage return character
D) null character

Question 23

When you want to read data from a text file, you create a file object using the ____________.

A) StreamReader class
B) TextReader class
C) StreamWriter class
D) TextWriter class

Question 24

In the loop header of the for loop, which expression should not end with a semicolon?

A) initialization expression
B) test expression
C) update expression
D) none of these

Question 25

When you want to write data to a text file, you create a file object using the ____________.

A) TextReader class
B) TextWriter class
C) StreamReader class
D) StreamWriter class

Question 26

The term ____________ is used to describe a file from which data is read.

A) input file
B) output file
C) data file
D) record

Question 27

You can use the StreamWriter class's ____________ to write a line of text to a file.

A) PrintLine method
B) WriteText method
C) WriteLine method
D) PrintText method

Question 28

When you work with a ____________, you access data from the beginning of the file to the end of the file.

A) sequential access file
B) direct access file
C) text file
D) input file

Question 29

To append data to an existing file, you open it with the ____________ method.

A) File.Append
B) File.AppendAll
C) File.AppendText
D) File.OpenExistingText

Question 30

When you work with a ____________, you can jump directly to any piece of data in the file without reading the data that comes before it.

A) file object
B) binary file
C) direct access file
D) sequential access file

Question 31

A ____________ contains data that has not been converted to text.

A) source file
B) binary file
C) data file
D) save file

Question 32

A ____________ contains data that has been encoded as text using a scheme such as Unicode.

A) document
B) spreadsheet
C) binary file
D) text file

Question 33

Be careful not to place a statement that modifies the counter variable in the body of the ____________.

A) while loop
B) if statement
C) for loop
D) switch statement

Question 34

If you specify a path in a string literal, be sure to prefix the string with the ____________ character.

A) #
B) @
C) $
D) *

Question 35

The term ____________ is used to describe a file to which data is written.

A) input file
B) output file
C) data file
D) record

Question 36

You can use the StreamReader class's ____________ to read a line of text from a file.

A) ReadLine method
B) ReadText method
C) GetNext method
D) Read method

Question 37

Files on disk are identified by a(n) ____________.

A) index
B) filename
C) access number
D) binary signature

Question 38

Many systems, including Windows, support the use of ____________, which are short sequences of characters that appear at the end of a filename and are preceded by a period.

A) filename extensions
B) pragmatic identifiers
C) binary indices
D) run time signatures

Question 39

The ____________ is a method provided by the StreamWriter class that writes an item of data to a text file without writing a newline character.

A) Print method
B) Text method
C) WriteLine method
D) Write method

Question 40

A ____________, is an object that is associated with a specific file and provides a way for the program to work with that file.

A) file instance
B) file object
C) filename class
D) referential extension

Question 41

The ____________ displays a standard Windows Save As dialog box.

A) SaveAs method
B) SaveFileDialog control
C) Save_File event
D) OpenFileDialog control

Question 42

The ____________ allows the user to browse the system and select a location and name for a file that is about to be saved.

A) Save As dialog box
B) Save File dialog box
C) Select Source dialog box
D) Open dialog box

Question 43

The .NET Framework provides a class named ____________ that you can use in C# to generate random numbers.

A) Rand
B) Random
C) GenNum
D) RandomGenerator

Question 44

If the user clicks the Open button, the OpenFileDialog control's ShowDialog method returns the value ____________.

A) Result.True
B) DialogResult.OK
C) DialogResult.Open
D) Result.OpenFile

Question 45

The expression ____________ causes an object of the Random class to be created in memory.

A) GetRandom(int)
B) GenerateRandom(number)
C) new Random()
D) random new()

Question 46

The variable that is used to accumulate the total of the numbers in a running total is called a(n) ____________.

A) counter
B) sentinel
C) entity
D) accumulator

Question 47

You can change the default text displayed in the Open dialog box's title bar by changing the control's ____________.

A) Caption property
B) Text property
C) Title property
D) Heading property

Question 48

Once you have created a Random object, you can call its ____________ method to get a random integer number.

A) Next
B) GetInteger
C) GenerateNumber
D) NextInteger

Question 49

When the user selects a file with the Open dialog box, the file's path and filename are stored in the control's ____________.

A) FilePath property
B) Source property
C) Location property
D) Filename property

Question 50

A file's ____________ marks the location of the next item that will be read from the file.

A) bit count
B) index value
C) read position
D) newline character

Question 51

The numbers that are generated by the Random class are ____________that are calculated by a formula.

A) pseudorandom numbers
B) binary encoded numbers
C) algebraic derivatives
D) complex variables

Question 52

You can use the StreamReader class's ____________ to determine if the file's read position is at the end of the file.

A) EndOfFile property
B) StreamEnd method
C) EndOfStream property
D) EOF method

Question 53

When controls such as the OpenFileDialog and SaveFileDialog are created they do not appear on the form, but in an area at the bottom of the Designer known as the ____________.

A) control overflow
B) design space
C) component tray
D) virtual form

Question 54

In code, you can display a Save As dialog box by calling the SaveFileDialog control's ____________ method.

A) SaveAs
B) Show
C) ShowDialog
D) Display

Question 55

You can specify the directory to be initially displayed by the Open dialog box by storing its path in the ____________.

A) InitialDirectory property
B) Source property
C) Filename property
D) Path property

Question 56

The ____________ displays a standard Windows Open dialog box.

A) Open method
B) OpenFileDialog control
C) SaveFileDialog control
D) component tray

Question 57

You can call a Random object's ____________ method to get a random floating-point number between 0.0 and 1.0.

A) GetDouble
B) NextFloat
C) NextDouble
D) DoubleRand

Question 58

The ____________ is useful in applications that must open an existing file because it allows the user to browse the system and select the file.

A) File.OpenText method
B) OpenFileDialog control
C) Open dialog box
D) Windows Explorer

Question 59

A(n) ____________ accumulates a total by adding each number in a series as they are read from a file.

A) running total
B) numeric tally
C) active summary
D) dynamic collection

Question 60

If the user clicks the Cancel button, the SaveFileDialog control's ShowDialog method returns the value ____________.

A) Result.False
B) DialogResult.Cancel
C) DialogResult.Abort
D) Result.NULL

Question 61

A ____________ is used in the calculation to generate random numbers.

A) sentinel
B) logarithmic value
C) seed value
D) Random object

Question 62

Incrementing a decrementing is so commonly done in programs that C# provides a set of simple unary operators designed just for incrementing a decrementing variables.

Question 63

When you run an application, the application's form is loaded into memory and an event known as the ____________ takes place.

A) Load event
B) Launch event
C) Boot event
D) Initialization event

Question 64

You can only add values of the string data type to a ListBox control.

Question 65

Not only may the counter variable of a for loop be initialized in the initialization expression, but it may also be declared there.

Question 66

By indenting the statements in the body of the loop, you visually set the apart from the surrounding code.

Question 67

It is possible to write a for loop in such a way that it will never iterate.

Question 68

The while loop gets its name from the way it works: While a Boolean expression is true, do some task.

Question 69

In the update expression of a for loop, it is required to use the ++ operator in the increment expression.

Question 70

In a count-controlled loop, you can only decrement the counter variable.

Question 71

When a variable is declared in the initialization expression of a for loop, the scope of the variable is limited to the loop.

Question 72

If you are writing a while loop that has only one statement in its body, you do not have enclose the statement inside curly braces.

Question 73

If the ListBox is empty, the Items.Count property equals -1.

Question 74

The do-while loop always performs at least one iteration, even if its Boolean expression is false to begin with.

Question 75

In most circumstances you should avoid writing infinite loops.

Question 76

Counter variables are commonly used to hold Boolean values that control the number of times that a loop iterates.

Question 77

The first line of the for loop is known as the loop title.

Question 78

The ++ operator is pronounced "plus plus" and the -- operator is pronounced "minus minus".

Question 79

When you write a simple statement to increment or decrement a variable, it doesn't matter if you use prefix mode or postfix mode.

Question 80

An important characteristic of the while loop is that the loop will always iterate at least once, even if the Boolean expression is false to start with.