Deck 13: Advanced File and Io Operations

Question 1

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

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

Answer 1

D

Question 2

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);

Answer 2

True

Question 3

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

Answer 3

True

Question 4

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

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

Question 5

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

Question 6

The statement dataFile.close();

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

Question 7

The state bit, ________, can be tested to see if the end of an input stream has been encountered.

A) ios::eof
B) ios::eofbit
C) ios::failbit
D) ios::badbit
E) None of the above

Question 8

The ________ may be used to write information to a file.

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

Question 9

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

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

Question 10

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

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

Question 11

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

Question 12

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

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

Question 13

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

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

Question 14

Data stored ________ is lost when the computer is powered down.

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

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

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

Question 20

Which statement opens a file and links it to a file stream object?

A) open(AFile) = link(anObject);
B) file.open("filename.txt");
C) linkstream("filename.txt");
D) link(open(filename.txt"));
E) None of the above

Question 21

Closing a file causes any buffered information to be

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

Question 22

ofstream, ifstream, and fstream are

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

Question 23

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

Question 24

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

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

Question 25

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

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

Question 26

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

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

Question 27

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

Question 28

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

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

Question 29

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

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

Question 30

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

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

Question 31

A file must be ________ before data can be written to or read from it.

A) closed
B) opened
C) declared
D) initialized
E) None of the above

Question 32

The member function ________ writes a single character to a file.

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

Question 33

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

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

Question 34

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

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

Question 35

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

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

Question 36

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

Question 37

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

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

Question 38

The ________ may be used to read information from a file.

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

Question 39

Which statement opens a file in such a way that information will only be written to its end?

A) dataFile(open.append("info.dat");
B) dataFile.open("info.dat", ios::out | ios::app);
C) dataFile.open = "C:\\info.dat" ios:append;
D) open(dataFile.append);
E) None of the above

Question 40

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

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