Deck 6: Io Streams As an Introduction to Objects and Classes

Question 1

Data that is sent to an output stream representing a file will be immediately saved to disk.

Answer 1

False

Question 2

When passing a stream to a function, it must always be pass-by-__________.

Answer 2

reference

Question 3

A _____________ is a flow of characters or other data.

Answer 3

stream

Question 4

All data is input and output as ____________ data.

Question 5

A type whose variables are objects is known as a ___________.

Question 6

'\n' is two characters.

Question 7

The formatting options that were discussed for cout do not work for output file streams.

Question 8

You may not have more than one input and one output stream open at any one time.

Question 9

A value that can be turned on or off is called a ________.

Question 10

You may use a read extraction) as a boolean expression in an if or while statement.

Question 11

The flag to always show the decimal point in floating numbers is ios:: _________

Question 12

The flag to display floating point numbers in non-scientific notation is ios:: _________

Question 13

Which command reads one character even if that character is a blank space? ___________

Question 14

open is a __________ function of the ofstream and ifstream class.

Question 15

You must use a width statement before each variable that you want output in a certain width

Question 16

Streams may be passed to a function.

Question 17

Using directives can be placed either directly after the include directives, or at the beginning of each function definition.

Question 18

The manipulator used to change the number of decimal places displayed is _________

Question 19

If you use the width command, it stays in effect for all values that are send to the stream.

Question 20

Two different objects of the same class have a different set of member functions.

Question 21

In the following function declaration, the istream object cin is called a ___________________.
void outputistream& in=cin);

Question 22

Which of the following is the correct way to close a file stream named outFile?

A) outFile.close);
B) outFile.close;
C) outFile.close"project.txt");
D) closeoutFile);

Question 23

To open a file with a user supplied name, you would need to store the name in a variable. If the file name was to have no more than 20 characters in it, which would be an appropriate declaration of the file name variable?

A) char filename;
B) char filename20);
C) char filename[20];
D) char filename[21];

Question 24

Which include directive is necessary for file IO

A) #include
B) #include
C) #include
D) #include

Question 25

If a file did not open correctly, you should

A) continue on anyway
B) display an error message and continue on
C) display an error message and take some suitable action such as exit
D) exit the program immediately

Question 26

After a stream is opened, before it is used for input and output, it should be

A) declared
B) closed
C) checked to see if it opened correctly
D) none of the above

Question 27

Which statement correctly opens an input stream named in_file and attaches it to a file name project.txt?

A) in_file=project.txt
B) in_file="project.txt"
C) in_file.open"project.txt");
D) in_file.openproject.txt);

Question 28

The member function setf stands for

A) set the file name
B) set the flags
C) set the format
D) nothing

Question 29

To open an output file and add to the end of the data already in the file you would write

A) outFile.open"project.txt");
B) outFile.append"project.txt");
C) outFile.open"project.txt", append);
D) outFile.open"project.txt", ios::app);

Question 30

The member function eof) is true/false) when we are ready to read the end of file character.

Question 31

When is the external name of the file used in the program?

A) Any time you read or write to the file
B) Never
C) Only when reading from the file
D) When opening the file stream

Question 32

A __________ is a variable that has functions as well as data associated with it.

A) member
B) int
C) object
D) float

Question 33

A function that is associated with an object is called a _________ function.

A) input
B) output
C) member
D) instantiated

Question 34

"\n" is a ________ and '\n' is a _______________.

Question 35

In order to read data from a file you

A) must know the kind of data in the file
B) do not need to know the kind of data in the file
C) should prompt the user for the data you are looking for
D) a and c

Question 36

Which of the following is not used when using files for input and output

A) Opening the file stream
B) Ensuring that the stream opened
C) Closing the stream
D) Prompting for file data

Question 37

The command outFile.precision2);

A) truncates all floating point variables to 2 decimal places
B) sets all output streams in your program to display 2 secimal places
C) displays integers as floating point numbers.
D) displays all floating point values sent to outFile with 2 decimal places.

Question 38

If the name of the input file was in a variable named filename, which of the following is the correct way to open the input stream named inFile and associate it with this file?

A) inFile.openfilename);
B) inFile=filename;
C) inFile="filename";
D) inFile.open"filename");

Question 39

Which of the following is the correct way to determine if a file stream named inFile opened correctly?

A) if inFile.open) )
B) if inFile.fail) )
C) if inFile.opened) )
D) if inFile.failed) )

Question 40

The _______ function puts one character back into the input stream.

Question 41

The get function reads

A) one integer value
B) one float value
C) one double value
D) one character value

Question 42

In order to use the stream manipulators, you must include the ______ library

A) manip
B) iomanip
C) cstdlib
D) fstream

Question 43

The command outFile.width10) is used to

A) change the number of characters in the output
B) sets the filename of outFile to 10 characters
C) always uses 10 characters to display the output
D) displays the next value in at least 10 characters

Question 44

What character will be in variable c after running this code?
Int x;
Char c;
Cin >> x;
Cin)getc);

A) Whatever character is typed by the user
B) Newline
C) Null
D) Blank

Question 45

What is wrong with the following code?
While ! fileIn.eof) )
{
FileIn >> value;
FileOut << value;
}

A) We have read past the end of the input file and attempt to output a nonexistent value
B) We have written past the end of the output file
C) Nothing
D) A and B

Question 46

We have a file that has a name in it, but the name is written one character per line. We need to write this name to the screen. What is wrong with the following code?
Ifstream fileIn;
FileIn.open"file.txt");
Char ch;
FileIn.getch)
While!fileIn.eof))
{
Cout.putch);
FileIn.getch);
}

A) can not use put with cout.
B) our output has new lines in it.
C) nothing is wrong
D) eof is not a member of an ifstream object

Question 47

Which of the following loop condition statements will read all the data in the file assuming that each record in the file is two integer values, and you will read the first one into a variable named intOne, and the other into intTwo?

A) whileinFile >> intOne >> intTwo)
B) whileinFileintOne, intTwo))
C) whileinFile)
D) whileinFile << intOne << intTwo)
E) A and B

Question 48

What is the output of the following code?
Char ch='G';
Cout << tolowerch) << endl;

A) G
B) g
C) the integer value of 'g'
D) the integer value of 'G'

Question 49

The put function outputs

A) one character value
B) one float value
C) one integer value
D) one double value

Question 50

If the user types in the characters 10, and your program reads them into an integer variable, what is the value stored into that integer?

A) 1
B) 0
C) 10
D) none of the above.

Question 51

ios::showpos is a flag that

A) always displays a + in front of positive integers
B) can be used to find the absolute value of an integer
C) always displays a + in front of all integers
D) all of the above

Question 52

Which function returns true if the character argument is a letter?

A) isdigit
B) islower
C) isalpha
D) isspace