Deck 3: Inputoutput

Question 1

Suppose that x and y are int variables, ch is a char variable, and the input is: 4 2 A 12
Choose the values of x, y, and ch after the following statement executes:
Cin >> x >> ch >> y;

A) x = 4, ch = 2, y = 12
B) x = 4, ch = A, y = 12
C) x = 4, ch = ' ', y = 2
D) This statement results in input failure

Answer 1

D

Question 2

Suppose that x is an int variable, ch is a char variable, and the input is: 276.
Choose the values after the following statement executes:
Cin >> ch >> x;

A) ch = '2', x = 276
B) ch = '276', x = '.'
C) ch = ' ', x = 276
D) ch = 'b', x = 76

Answer 2

B

Question 3

If input failure occurs in a C++ program, the program terminates immediately and displays an error message.

Answer 3

False

Question 4

Suppose that alpha is an int variable and ch is a char variable and the input is: 17 A
What are the values after the following statements execute?
Cin >> alpha;
Cin >> ch;

A) alpha = 17, ch = ' '
B) alpha = 1, ch = 7
C) alpha = 17, ch = 'A'
D) alpha = 17, ch = 'a'

Question 5

Suppose that x and y are int variables, z is a double variable, and the input is: 28 32.6 12
Choose the values of x, y, and z after the following statement executes:
Cin >> x >> y >> z;

A) x = 28, y = 32, z = 0.6
B) x = 28, y = 32, z = 12.0
C) x = 28, y = 12, z = 32.6
D) x = 28, y = 12, z = 0.6

Question 6

In the statement cin >> x;, x can be a variable or an expression.

Question 7

In an output statement, each occurrence of endl advances the cursor to the end of the current line on an output device.

Question 8

Suppose that x is an int variable, y is a double variable and ch is a char variable and the input is: 15A 73.2
Choose the values after the following statement executes:
Cin >> x >> ch >> y;

A) x = 15, ch = 'A', y = 73.2
B) x = 15, ch = 'A', y = 73.0
C) x = 15, ch = 'a', y = 73.0
D) This statement results in an error because there is no space between 15 and A.

Question 9

It is a good idea to redefine cin and cout in your programs.

Question 10

Suppose that x is an int variable, y is a double variable, z is an int variable, and the input is: 15 76.3 14
Choose the values after the following statement executes:
Cin >> x >> y >> z;

A) x = 15, y = 76, z = 14
B) x = 15, y = 76, z = 0
C) x = 15, y = 76.3, z = 14
D) x = 15.0, y = 76.3, z = 14.0

Question 11

Suppose that x and y are int variables. Which of the following is a valid input statement?

A) cin >> x >> cin >> y;
B) cin >> x >> y;
C) cin << x << y;
D) cout << x << y;

Question 12

When reading data into a char variable, after skipping any leading whitespace characters, the extraction operator >> finds and stores only the next character; reading stops after a single character.

Question 13

Suppose that x is an int variable and y is a double variable and the input is: 10 20.7
Choose the values after the following statement executes: cin >> x >> y;.

A) x = 10, y = 20
B) x = 10, y = 20.0
C) x = 10, y = 20.7
D) x = 10, y = 21.0

Question 14

The following statements will result in input failure if the input values are not on a separate line. (Assume that x and y are int variables.)
cin >> x;
cin >> y;

Question 15

Entering a char value into an int variable causes serious errors, called input failure.

Question 16

The extraction operator >> skips only all leading blanks when searching for the next data in the input stream.

Question 17

Suppose that ch1 and ch2 are char variables, alpha is an int variable, and the input is: A 18
What are the values after the following statement executes?
Cin)get(ch1);
Cin)get(ch2);
Cin >> alpha;

A) ch1 = 'A', ch2 = ' ', alpha = 18
B) ch1 = 'A', ch2 = '1', alpha = 8
C) ch1 = 'A', ch2 = ' ', alpha = 1
D) ch1 = 'A', ch2 = '\n', alpha = 1

Question 18

The number of input data extracted by cin and >> depends on the number of variables appearing in the cin statement.

Question 19

Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A B
C
Choose the value of ch3 after the following statement executes:
Cin >> ch1 >> ch2 >> ch3;

A) 'A'
B) 'B'
C) 'C'
D) '\n'

Question 20

You can use the function getline to read a string containing blanks.

Question 21

In C++, the dot is an operator called the ____ operator.

A) dot access
B) member access
C) data access
D) member

Question 22

The functions get, ignore, and so on are members of the data type ____________________.

Question 23

Suppose that outFile is an ofstream variable and output is to be stored in the file outputData.out. Which of the following statements opens the file outputData.out and associates outFile to the output file?

A) outFile("outputData.out");
B) outFile.open("outputData.out");
C) open(outFile,"outputData.out");
D) open.outFile("outputData.out");

Question 24

Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A B
C
What is the value of ch3 after the following statements execute?
Cin)get(ch1);
Cin)get(ch2);
Cin)get(ch3);

A) 'A'
B) 'B'
C) 'C'
D) '\n'

Question 25

What is the output of the following statements? cout << setfill('*');
Cout << "12345678901234567890" << endl
Cout << setw(5) << "18" << setw(7) << "Happy"
<< setw(8) << "Sleepy" << endl;

A) 12345678901234567890
***18 Happy Sleepy
B) 12345678901234567890
***18**Happy**Sleepy
C) 12345678901234567890
***18**Happy Sleepy
D) 12345678901234567890
***18**Happy Sleepy**

Question 26

In the C++ statement,
cin.get(u);
u must be a variable of type ____________________.

Question 27

Suppose that ch1 and ch2 are char variables and the input is: WXYZ
What is the value of ch2 after the following statements execute?
Cin)get(ch1);
Cin)putback(ch1);
Cin >> ch2;

A) W
B) X
C) Y
D) Z

Question 28

____ is a parameterized stream manipulator.

A) endl
B) fixed
C) scientific
D) setfill

Question 29

What is the output of the following statements? cout << "123456789012345678901234567890" << endl
Cout << setfill('#') << setw(10) << "Mickey"
<< setfill(' ') << setw(10) << "Donald"
<< setfill('*') << setw(10) << "Goofy" << endl;

A) 123456789012345678901234567890
####Mickey Donald*****Goofy
B) 123456789012345678901234567890
####Mickey####Donald*****Goofy
C) 123456789012345678901234567890
####Mickey####Donald#####Goofy
D) 23456789012345678901234567890
****Mickey####Donald#####Goofy

Question 30

C++ comes with a wealth of functions, called ____________________ functions, that are written by other programmers.

Question 31

Manipulators without parameters are part of the ____ header file.

A) iostream
B) iomanip
C) ifstream
D) pmanip

Question 32

Suppose that ch1 and ch2 are char variables and the input is: WXYZ
What is the value of ch2 after the following statements execute?
Cin >> ch1;
Ch2 = cin.peek();
Cin >> ch2;

A) W
B) X
C) Y
D) Z

Question 33

Suppose that alpha, beta, and gamma are int variables and the input is: 100 110 120
200 210 220
300 310 320
What is the value of gamma after the following statements execute?
Cin >> alpha;
Cin)ignore(100, '\n');
Cin >> beta;
Cin)ignore(100,'\n');
Cin >> gamma;

A) 100
B) 200
C) 300
D) 320

Question 34

Consider the following program segment. ifstream inFile; //Line 1
Int x, y; //Line 2
).. //Line 3
InFile >> x >> y; //Line 4
Which of the following statements at Line 3 can be used to open the file progdata.dat and input data from this file into x and y at Line 4?

A) inFile.open("progdata.dat");
B) inFile(open,"progdata.dat");
C) open.inFile("progdata.dat");
D) open(inFile,"progdata.dat");

Question 35

When you want to process only partial data, you can use the stream function ____ to discard a portion of the input.

A) clear
B) skip
C) delete
D) ignore

Question 36

The stream function ____________________ lets you put the last character extracted from the input stream by the get function back into the input stream.

Question 37

Suppose that x = 1565.683, y = 85.78, and z = 123.982. What is the output of the following statements? cout << fixed << showpoint;
Cout << setprecision(3) << x << ' ';
Cout << setprecision(4) << y << ' ' << setprecision(2) << z << endl;

A) 1565.683 85.8000 123.98
B) 1565.680 85.8000 123.98
C) 1565.683 85.7800 123.98
D) 1565.683 85.780 123.980

Question 38

Suppose that x = 55.68, y = 476.859, and z = 23.8216. What is the output of the following statements? cout << fixed << showpoint;
Cout << setprecision(3);
Cout << x << ' ' << y << ' ' << setprecision(2) << z << endl;

A) 55.680 476.859 23.82
B) 55.690 476.860 23.82
C) 55.680 476.860 23.82
D) 55.680 476.859 23.821

Question 39

Suppose that x = 25.67, y = 356.876, and z = 7623.9674. What is the output of the following statements? cout << fixed << showpoint;
Cout << setprecision(2);
Cout << x << ' ' << y << ' ' << z << endl;

A) 25.67 356.87 7623.96
B) 25.67 356.87 7623.97
C) 25.67 356.88 7623.97
D) 25.67 356.876 7623.967

Question 40

The function ____________________ returns the next character in the input stream; it does not remove the character from the input stream.

Question 41

The manipulator ____________________ is used to output the value of an expression in a specific number of columns.

Question 42

On some compilers, the statements cin >> left; and cin >> right; might not work. In this case, you can use the statement ____________________ in place of cin >> left;.

Question 43

C++ provides a header file called ____________________, which is used for file I/O.

Question 44

On some compilers, the statements cin >> fixed; and cin >> scientific; might not work. In this case, you can use the statement ____________________ in place of cin >> fixed;.

Question 45

In C++, the dot is an operator called the ____________________operator.

Question 46

To use a parameterized stream manipulator in a program, you must include the header file ____________________.

Question 47

C++ has a special name for the data types istream and ostream. They are called ____________________.

Question 48

cin is called a(n) ____________________ object.

Question 49

To use the manipulator setprecision, the program must include the header file ____________________.

Question 50

You can disable the manipulator left by using the stream function ____________________.