Deck 14: Files and Streams

Question 1

The ____ class provides you with information about directories or folders.

A) Directory
B) File
C) Cabinet
D) Folder

Answer 1

A

Question 2

A ____ is a collection of fields that contain data about an entity.

A) file
B) character
C) record
D) bit

Answer 2

C

Question 3

The File class is contained in the System.IOFile namespace.

Answer 3

False

Question 4

When you copy data from a file on a storage device into RAM, you ____.

A) write to the file
B) read from the file
C) copy to the file
D) do not use streams

Question 5

Most computer users organize their files into ____ or directories.

A) folders
B) bins
C) buckets
D) drawers

Question 6

The ____ class contains methods that allow you to access information about files.

A) Cabinet
B) File
C) Directory
D) Folder

Question 7

A CSV file contains values separated by semicolon delimiters.

Question 8

A C# application ____ by creating an object and associating a stream of bytes with that object.

A) returns a file
B) closes a file
C) opens a file
D) removes a file

Question 9

A data file is a ____ access file when each record is read in order of its position in the file.

A) sequential
B) random
C) dynamic
D) temporary

Question 10

Files exist on ____ storage devices, such as hard disks, USB drives, reels of magnetic tape, and optical discs.

A) temporary
B) volatile
C) soft
D) permanent

Question 11

When you store data in a computer file on a persistent storage device, you ____.

A) read from the file
B) use an input stream
C) write to the file
D) erase data from memory

Question 12

When you write a program and save it to a disk, you are using temporary storage.

Question 13

When a C# application ____, the file is no longer available to the application.

A) opens a file
B) returns a file
C) writes to a file
D) closes a file

Question 14

Because you can erase data from files, some programmers prefer the term ____ storage to permanent storage.

A) volatile
B) temporary
C) transit
D) persistent

Question 15

Files that store music or images are in ____ format.

A) data
B) binary
C) text
D) information

Question 16

A ____ is any one of the letters, numbers, or other special symbols (such as punctuation marks) that comprise data.

A) field
B) record
C) delimiter
D) character

Question 17

When data values in a program are stored in memory, they are lost when the program ends.

Question 18

The terms directory and folder are used synonymously to refer to an entity that is used to organize files.

Question 19

Permanent storage is ____.

A) volatile
B) temporal
C) nonvolatile
D) soft storage

Question 20

When you write a C# program that stores a value in a variable, you are using temporary storage; the value you store is lost when the program ends or the computer loses power. This type of storage is ____.

A) volatile
B) nonvolatile
C) permanent
D) hard

Question 21

Using a ____ in your programs refers to the bad programming practice of hardcoding numbers (unnamed, literal constants) in code without explanation.

A) constant
B) token
C) magic number
D) character set

Question 22

The FileStream class has 15 overloaded constructors. What can you tell about the FileStream object named myFile , given the constructor below?
FileStream myFile =
new FileStream("SomeText.txt"), FileMode.Create,
FileAccess.Write);

Question 23

____ is the process of converting objects into streams of bytes.

A) Deserialization
B) Normalization
C) Streaming
D) Serialization

Question 24

Write a program that prompts a user for a filename and tests the file's existence. If the file exists, display the file creation time. If it does not exist, display a message.

Question 25

Temporary storage is usually called computer memory or _________________________.

Question 26

What is a character?

Question 27

Some files are ____________________ that contain facts and figures, such as a payroll file that contains employee numbers, names, and salaries.

Question 28

A file's ____ holds the byte number of the next byte to be read.

A) token
B) file position pointer
C) magic number
D) record token

Question 29

The ____ method is a member of the String class; it takes a character delimiter parameter and separates a string into substrings at each occurrence of the delimiter.

A) Separate()
B) Split()
C) Delimit()
D) Substring()

Question 30

The set of all the characters used to represent data on a particular computer is that computer's ____________________.

Question 31

A program that reads from a sequential access data file creates a FileStream object, and then the FileStream object is passed to a StreamReader object's constructor. Once this has been done, the ReadLine() method can be used to retrieve one line at a time from the data file. Show the sequence of instructions that would create the FileStream and StreamReader needed to access a data file, and then read one line from the file.

Question 32

When you produce screen output and accept keyboard input, you use the Console class, which provides access to which three standard streams?

Question 33

When you perform an input operation in an application, you can picture bytes flowing into your program from an input device through a ____, which functions as a pipeline or channel.

A) directory
B) stream
C) root
D) path

Question 34

What are the disadvantages to writing data to a text file using tokens and delimiters as opposed to writing an entire object to a file at once?

Question 35

Sometimes it is necessary to process a sequential text file multiple times from the beginning during a program's execution. After the file is processed the first time, the file pointer is at the end of the file. How can you reread the file at this point?

Question 36

Describe some of the methods of the Directory class.

Question 37

____ converts streams of bytes back into objects.

A) Deserialization
B) Serialization
C) Normalization
D) Denormalization

Question 38

What is a record?

Question 39

Tossing a file into a drawer of a file cabinet without a folder is the equivalent of placing a file in the main or ____________________ of your storage device when storing computer files.

Question 40

Businesses store data in a relationship known as the data ____________________.

Question 42

How can you create a class whose objects can be written to and read from data files? Show an example.