chapter 12 Flashcards
(38 cards)
Data stored here disappears once the program stops running or the computer is powered down.
A) on a CD
B) in RAM
C) on a backup tape
D) on the disk drive
E) None of these
Answer: B
n order, the three-step process of using a file in a C++ program involves:
A) Insert a disk, open a file, remove the disk
B) Create the file contents, close the file, name the file
C) Open the file, read/write/save data, close the file
D) Name the file, open the file, delete the file
E) None of these
Answer: C
This data type can be used to create files and write information to them but cannot be used to read
information from them.
A) ofstream
B) ifstream
C) afstream
D) outstream
E) None of these
Answer: A
This data type can be used to create files, read data from them, and write data to them.
A) ofstream
B) iftream
C) fstream
D) stream
E) None of these
Answer: C
Which statement opens a file and links it to a file stream object?
A) open(aFile) = link(anObject);
B) file.open(“c:\filename.txt”);
C) linkstream(“filename.txt”);
D) link(open(filename.txt”));
E) None of these
Answer: B
What is true about the following statement?
out.open(“values.dat”, ios::app);
A) If the file already exists, its contents are preserved and all output is written to the end of the file.
B) If the file exists, it should be replaced with a new copy of values.dat.
C) If the file exists, it can be opened but not modified.
D) None of these
Answer: A
Which of the following statements opens the file info.txt for both input and output?
A) dataFile.open(“info.txt”, ios::in && ios::out);
B) dataFile.open(“info.txt”, ios::in , ios::out);
C) dataFile.open(“info.txt”, input || output);
D) dataFile.open(“info.txt”, ios::in | ios::out);
Answer: D
The ________ marker is the character that marks the end of a file, and is automatically written when the file
is closed.
A) End of File (EOF)
B) No More Data (NMD)
C) Data Stream Close (DSC)
D) Data Read Stop (DRS)
E) None of these
Answer: A
This state bit can be tested to see if the end of an input stream is encountered.
A) ios::eof
B) ios::eofbit
C) ios::failbit
D) ios::badbit
E) None of these
Answer: B
This member function reads a single character from a file.
A) read
B) get
C) put
D) input
E) None of these
Answer: B
This member function can be used to store binary data to a file.
A) binary.out
B) write
C) put «
D) dataout(binary)
E) None of these
Answer: B
To access files from a C++ program, you must use this directive:
A) #include<fileaccess>
B) #include <filestream>
C) #include <fstream>
D) #include <iostream>
E) None of these</iostream></fstream></filestream></fileaccess>
Answer: C
To set up a file to perform file I/O, you must declare:
A) at least one variable, the contents of which will be written to the file
B) one or more file stream objects
C) a string object to store the file contents
D) All of these
E) None of these
Answer: B
ofstream, ifstream, and fstream are:
A) header files
B) libraries
C) data types
D) string arrays
E) None of these
Answer: C
This data type can be used to create files and read information from them into memory.
A) ofstream
B) istream
C) ifstream
D) instream
E) None of these
Answer: C
Outside of a C++ program, a file is identified by its ________. Inside a C++ program, a file is identified by
a(n) ________.
A) file number, file name
B) file name, file number
C) name, address
D) name, file stream object
E) None of these
Answer: D
When used by itself, this access flag 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 these
E) None of these
Answer: C
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 these
Answer: B
Closing a file causes any unsaved information still held in the file buffer to be ________.
A) saved to the file
B) deleted
C) retained in the buffer for safekeeping
D) duplicated
E) None of these
Answer: A
he end-of-file marker is automatically written ________.
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 these
Answer: C
ll stream objects have ________, which indicate the condition of the stream.
A) error state bits
B) condition statements
C) markers
D) intrinsic error messages
E) None of these
Answer: A
When a file is opened, 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 these
Answer: B
This 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 these
Answer: A
This member function writes a single character to a file.
A) get
B) write
C) put
D) insert
E) None of these
Answer: C
