Deck 13: Advanced File and Io Operations

Question 1

The operating system records the information that tracks the end of the file

A)when the program ends.
B)when a file is closed.
C)when a file is opened with ^ios::app.
D)when a file is opened with ^ios::eof.
E)None of the above

Answer 1

B

Question 2

Outside of a C++ program, a file is identified by its . Inside a C++ program, a file is accessed through a .

A)name, address
B)file name, file number
C)name, file stream object
D)file number, file name
E)None of the above

Answer 2

C

Question 3

The function can be used to store binary data to a file.

A)^binary.out
B)^put
C)^write
D)^{dataout(binary)}
E)None of the above

Answer 3

C

Question 4

The member function, _, reads a single character from a file.

A)^input
B)^get
C)^put
D)^read
E)None of the above

Question 5

All stream objects have that indicate the condition of the stream.

A)error state bits
B)markers
C)intrinsic error messages
D)condition statements
E)None of the above

Question 6

The process of writing in- memory objects to a file so that the object can later be read back into memory

A)requires special operation system support.
B)is called deserialization.
C)requires the use of specialized convert constructors.
D)is called serialization.
E)None of the above

Question 7

The statement ^{dataFile.close();}

A)is legal but risks losing valuable data.
B)needs a file name argument to execute correctly.
C)is illegal in C++.
D)closes a file.
E)None of the above

Question 8

Data stored is lost when the computer is powered down.

A)on CD ROM
B)in RAM
C)on the hard disk
D)on a backup tape
E)None of the above

Question 9

The state bit,

A)^ios::eof
B)^ios::failbit
C)^ios::badbit
D)^ios::eofbit , can be tested to see if the end of an input stream has been encountered.
E)None of the above

Question 10

^ofstream, ^ifstream, and ^fstream are

A)libraries.
B)string arrays.
C)data types.
D)header files.
E)None of the above

Question 11

A file _ is a small holding section of memory that file- bound information is first written to.

A)name
B)number
C)segment
D)buffer
E)None of the above

Question 12

Closing a file causes any buffered information to be

A)saved to the file.
B)duplicated.
C)deleted.
D)stored in a buffer for safekeeping.
E)None of the above

Question 13

The state bit is set when an attempted operation has failed.

A)^ios::badbit
B)^ios::goodbit
C)^{ios::hardfail}
D)^ios::failbit
E)None of the above

Question 14

The data type can be used to create files and write information to them.

A)^ofstream
B)^ostream
C)^istream
D)^ifstream
E)None of the above

Question 15

The data type can be used to connect to files and read information from them into memory.

A)^ifstream
B)^instream
C)^ofstream
D)^istream
E)None of the above

Question 16

When a file is opened for reading, the file stream object's "read position" is

A)at the end of the file.
B)nonexistent, until the programmer declares it.
C)at the beginning of the file.
D)in the middle of the file.
E)None of the above

Question 17

The may be used to read information from a file.

A)the stream insertion operator
B)stream extraction operator
C)^file.in macro
D)^cout object
E)None of the above

Question 18

The member function reports when the end of a file has been found.

A)^stop()
B)^eof()
C)^end()
D)^done()
E)None of the above

Question 19

To access files from a C++ program, you must ^#include

A).
B).
C).
D).
E)None of the above

Question 20

The may be used to write information to a file.

A)^fileWrite() function
B)stream insertion operator ^<<
C)^pen object
D)^cout object
E)None of the above

Question 21

To set up a file to perform file I/O, you must declare

A)at least one variable to write to the file.
B)a string array to store the file contents.
C)one or more file stream objects.
D)All of the above
E)None of the above

Question 22

The member function

A)^write
B)^get
C)^insert
D)^put
E)None of the above

Question 23

A file must be

A)initialized
B)closed
C)opened
D)declared _ before data can be written to or read from it.
E)None of the above

Question 24

File output may be formatted the same way as screen output.

Question 25

The stream member function ^fail() can be used to determine whether the last operation performed on a stream was successful.

Question 26

When used by itself, _ causes a file's contents to be deleted if the file already exists.

A)^ios::in
B)^ios:app
C)^ios::out
D)All of the above
E)None of the above

Question 27

The ^{ios::hardfail} bit is set when an unrecoverable error occurs.

Question 28

To write to a binary file, you can use the ^write() member function of an ^ofstream
object.

Question 29

Opening a file with the flags ^{ios::in | ios::out} will preserve the contents of the file if the file already exists.

Question 30

^string objects cannot be stored to a binary file without further processing because they contain pointers.

Question 31

The operation of moving to a particular location in an input file is accomplished through

A)the ^locate member function.
B)the ^seekg member function.
C)the ^seekp member function.
D)the ^move member function.
E)None of the above

Question 32

When you store data in a variable, it is automatically saved in a file.

Question 33

The ^read and ^write member functions of ^fstream objects can only work with buffers specified by pointers to ^char.

Question 34

When the ^>> operator extracts information from a file, it expects to read data that are separated by

A)commas.
B)whitespace.
C)tabs.
D)semicolons.
E)None of the above

Question 35

When you assign a name to a file, the operating system identifies the file by that name.

Question 36

The term means non- sequentially accessing information in a file.

A)^{cin.getrandom}
B)random access
C)^{read.randomly}
D)^cin.getline
E)None of the above

Question 37

An alternative to using the ^open member function is to use the file stream object declaration itself to open the file.
Example: ^{fstream dataFile("names.dat",ios::in|ios::out);}

Question 38

Only one file stream object can be declared per C++ program.