Ch.6

Question 1

What is the output of the following code?
char ch = ‘G’;
cout ≤≤ tolower(ch) ≤≤ endl;

Answer 1

the integer value of ‘g’

Question 2

The command outFile.width(10) is used to

Answer 2

display the next value in at least 10 characters.

Question 3

Which of the following function declarations will correctly pass an output stream to the function?

A) void display( ofstream& out);
B) void display( ostream out);
C) void display( ostream& out);
D) void display( ofstream out);
E) A and C

Answer 3

void display( ostream& out);

Question 4

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

Answer 4

checked to see if it opened correctly.

Question 5

The command outFile.precision(2);

Answer 5

displays all floating point values sent to outFile with 2 decimal places.

Question 6

If a file did not open correctly, you should

Answer 6

display an error message and take some suitable action such as exit.

Question 7

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

Answer 7

isalpha

Question 8

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?

Answer 8

char filename[21];

Question 9

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

Answer 9

if( inFile.fail( ) )

Question 10

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

Answer 10

member

Question 11

What is wrong with the following code?

while( ! fileIn.eof( ) )
{
fileIn >> value;
fileout << value;
}

Answer 11

We have read past the end of the input file

Question 12

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?

Answer 12

inFile.open(filename);

Question 13

The ifstream class is derived from the

Answer 13

istream class

Question 14

ios::showpos is a flag that

Answer 14

always displays a + in front of positive integers.

Question 15

The member function setf stands for

Answer 15

set the flags

Question 16

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

Answer 16

when opening the file stream

Question 17

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

Answer 17

outFile.open(“project.txt”, ios::app);

Question 18

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?

Answer 18

while(inFile >> intOne >> intTwo)

Question 19

Which of the following function declarations will accept either cout or a file stream object as its argument?

Answer 19

void output( ostream &outFile);

Question 20

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

Answer 20

in_file.open(“project.txt”);

Question 21

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

Answer 21

flag

Question 22

A ________ is a flow of characters or other data.

Answer 22

stream

Question 23

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

Answer 23

showpoint

Question 24

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

Answer 24

setprecision

Question 25

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

Answer 25

fixed

Question 26

In the following function declaration, the istream object cin is called a \_\_\_\_\_\_\_\_.
 void output(istream& in = cin);

Answer 26

default argument

Question 27

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

Answer 27

get

Question 28

“\n” is a ________ and ‘\n’ is a ________.

Answer 28

string, character

Question 29

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

Answer 29

false

Question 30

A type whose variables are objects is known as a

Answer 30

class

Question 31

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

Answer 31

False

Question 32

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

Answer 32

False

Question 33

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

Answer 33

True

Question 34

Streams may be passed to a function.

Answer 34

True

Question 35

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

Answer 35

True

Question 36

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

Answer 36

True

Question 37

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

Answer 37

True