Deck 18: Files and Streams

Question 1

The standard output stream object enables a program to output data to the
screen.

Answer 1

True

Question 2

Console.In,Console.Out and Console.Error are used to take data in,to display data and to show error messages,respectively.

Answer 2

True

Question 3

Data stored in a file is considered:

A)temporary data
B)persistent data
C)recurring data
D)there is no need to store data in files

Answer 3

B

Question 4

The Console.Error property returns:

A)a standard error stream object
B)a new error
C)an object of type error
D)None of the above

Question 5

Saving data to a file retains that data after the program terminates.

Question 6

Files can be stored in:

A)hard drives
B)optical disks
C)flash drives
D)All of the above

Question 7

Classes StreamIn and StreamOut are used to read from text files and output to text files.

Question 8

Characters in Visual Basic are Unicode characters,each represented by one byte.

Question 9

The smallest data item in a computer is the _________.

A)bit
B)byte
C)kilobyte
D)None of the above.

Question 10

One byte is composed of:

A)2 bits
B)4 bits
C)8 bits
D)10 bits

Question 11

A record is a group of fields and a file is a group of records.

Question 12

_______________ are used for long-term retention of large amounts of data.

A)Arrays
B)Buffers
C)Files
D)Data structures.

Question 13

Directory method GetDirectories returns _______.

A)a string with all the names of sibling directories
B)an array of strings with all the names of sibling directories
C)a string with all the names of subdirectories
D)an array of strings with all the names of subdirectories

Question 14

No matter how complicated a program is or looks it can all be broken down into a series of 0's and 1's.

Question 15

In a data hierarchy,data items become larger and more complex in structure as we progress from bits,to characters,to fields and up to large data structures.

Question 16

When a file is opened,a stream object is created and associated with the file.

Question 17

Data stored in arrays is permanent data.

Question 18

Visual Basic views every file simply as a sequential stream of bytes.

Question 19

To distinguish records,there has to be at least one field that is unique for each instance;this is called the record key.

Question 20

In a ____________ file,records are typically stored in order by a record-key field.

A)chronological
B)non-sequential
C)sequential
D)record-key

Question 21

Which of the following methods of FileStream will reset the file-position pointer back to the beginning of the file?

A)Reset
B)Origin
C)Seek
D)Beginning

Question 22

An OpenFileDialog allows a user to select a file to open.

Question 23

Visual Basic provides the class _______ for manipulating files.

A)Folder
B)FileUtil
C)File
D)FileManip

Question 24

The enumeration FileAccess is used to ________.

A)control future users' access to a file
B)control program access to a file
C)control the amount of updating that can be done on a file at once
D)FileAccess is a method,not an enumeration.

Question 25

Records in a sequential access file are always sorted by a record key

Question 26

To access a file,you must instantiate an object of type File.

Question 27

What kind of exception is thrown if there's a problem opening or creating a StreamWriter?

A)Exception
B)StreamException
C)OpenAndCreatingException
D)IOException

Question 28

Class File can only create new files.

Question 29

Which method creates a new file and returns a stream to process that file?

A)CreateFile method of class File
B)NewFile method of class File
C)Create method of class File
D)New method of class File

Question 30

Every file automatically closes itself when it's no longer needed.

Question 31

You can use the FileAccess enumeration to control access to
file when the file is opened.

Question 32

A FileStream object can throw a(n)________ if an attempt is made to open a file that does not exist.

A)NoFileException
B)FileNotFoundException
C)OpenErrorException
D)FileStreamException.

Question 33

A _____________ contains the byte number of the next byte in a file to be read or written to a file.

A)data locator
B)file counter
C)file-position pointer
D)byte-number counter.

Question 34

The classes dealing with files and directories are located in the System.IO namespace.

Question 35

Method GetFiles of Directory can be used to obtain a list of all the files in a given directory.

Question 36

What is the exception thrown when an error occurs during serialization or deserialization?

A)SerialException
B)DeserialException
C)SerializationException
D)DeserializationException
E)c and d,respectively

Question 37

Class Directory can be used to change directories.

Question 38

When a FileStream object is opened,the file-position pointer is _________.

A)set to Nothing
B)set to 0
C)needs to be explicitly created
D)set to the end of the file

Question 39

A serialized object is an object that includes ________.

A)a sequence of bytes about the object's data
B)information about the object's type
C)information about the types of data stored in the object
D)All of the above

Question 40

A StreamReader object must be created in order to retrieve data from a text file.

Question 41

BinaryFormatter allows for only reading objects.

Question 42

Which of the following attributes is needed to indicate to the CLR that objects of the class can be serialized?

A)
B)
C)
D)both a and b

Question 43

For variables of reference types,you must check the class declaration to ensure that the type is serializable.

Question 44

By default,array objects are not serializable.

Question 45

BinaryFormatter's Serialize and Deserialize methods are both parameterless.

Question 46

Another way that a class could indicate to the CLR that objects of the class can be serialized is through implementing the ________ interface.

A)Serializable
B)ISerializable
C)Serial
D)ISerial

Question 47

All primitive-type variables and strings are serializable.

Question 48

Method ________ of class BinaryFormatter reads a serialized object from a stream and reforms the object in memory.

A)Deserial
B)Deserialize
C)Deserializable
D)DSerial

Question 49

In a class that's marked with the <Serializable()> attribute or that implements interface ISerializable,not every instance variable of the class needs to be serializable.

Question 50

The name of the file to open is specified as the first argument to the FileStream constructor.

Question 51

Deserialize returns a reference of type:

A)Object which must be cast to the appropriate type to manipulate the object
B)the type that the object was originally
C)Deserialized which must be cast to the appropriate type to manipulate the object
D)None of the above

Question 52

An array is always serializable.

Question 53

BinaryFormatters can be used to serialize and deserialize objects coming in and going out of a stream.