Deck 3: Inputoutput

Question 1

Suppose that ch1, ch2, and ch3 are variables of the type char. 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'

Answer 1

C

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

Answer 2

A

Question 3

Suppose that x and y are int variables, and z is a double variable. 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

Answer 3

A

Question 4

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

Question 5

Suppose that x is an int variable and y is a double variable. 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 6

Suppose that x is an int variable, y is a double variable, and z is an int variable. 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 7

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

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

Question 8

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

Question 9

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

Question 10

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

Question 11

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

Question 12

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 13

Suppose that x is an int variable, y is a double variable, and ch is a char variable. 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 14

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 15

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

Question 16

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 17

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

Question 18

Suppose that ch1 and ch2 are char variables, and alpha is an int variable. The input is: ​
A 18
​
What are the values after the following statement executes?
​
​

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 19

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

Question 20

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

Question 21

Suppose that x = 25.67, y = 356.876, and z = 7623.9674. What is the output of the following statements?

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 22

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

Question 23

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

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

Question 24

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

Question 25

What is the output of the following statements?

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

Question 26

Suppose that ch1, ch2, and ch3 are variables of the type char. 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 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?

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

Question 28

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 29

What is the output of the following statements?

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

Question 30

Consider the following program segment. 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 31

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 32

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

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?

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

Question 34

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

Question 35

Suppose that x = 1565.683, y = 85.78, and z = 123.982. What is the output of the following statements?

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 36

Suppose that ch1 and ch2 are char variables and the input is: WXYZ
What is the value of ch2 after the following statements execute?

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

Question 37

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

Question 38

Manipulators without parameters are part of the ____ header file.

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

Question 39

Suppose that x = 55.68, y = 476.859, and z = 23.8216. What is the output of the following statements?

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 40

____ is a parameterized stream manipulator.

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