Quiz 3

Question 1

The ____ statement is used to enter data in a program while it’s running.

A) cout

B) data

C) cin

D) input

Answer 1

cin

Question 2

in C++, accessing mathematical functions in a program requires including the mathematical header file ____.

A) number

B) cmath

C) cnumber

D) math

Answer 2

cmath

Question 3

The ____ declaration qualifier specifies that the declared identifier is read-only after it’s initialized.:

A) unchanged

B) fix

C) fixed

D) const

Answer 3

const

Question 4

In C++, the expression sum = sum + 10 can be written as ____.

A) sum = 10+

B) sum =+ 10

C) sum += 10

D) +sum = 10

Answer 4

C

Question 5

In C++, the ____ symbol is called the assignment operator.

A) ==

B) =

C)&raquo_space;

D) ->

Answer 5

=

Question 6

To control the format of numbers displayed by cout, you can include field width ____ in an output stream.

A) escape sequences

B) manipulators

C) dividers

D) separators

Answer 6

manipulators

Question 7

The stream manipulator ____ sets the floating-point precision to n places.

A) setfill(‘x’)

B) setprecision(n)

C) setw(n)

D) showbase

Answer 7

B

Question 8

In C++, the mathematical function ____ calculates a number’s square root.

A) sqroot()

B) square()

C) squareRoot()

D) sqrt()

Answer 8

D

Question 9

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

A) True
B) False

Answer 9

False

Question 10

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

A) cin&raquo_space; x&raquo_space; cin&raquo_space; y;

B) cin&raquo_space; x&raquo_space; y;

C) cin &laquo_space;x &laquo_space;y;

D) cout &laquo_space;x &laquo_space;y;

Answer 10

B

Question 11

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&raquo_space; alpha;
cin.ignore(100, ‘\n’);
cin&raquo_space; beta;
cin.ignore(100,’\n’);
cin&raquo_space; gamma;

A) 100

B) 200

C) 300

D) 320

Answer 11

300

Question 12

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

A) True
B) False

Answer 12

True

Question 13

When reading data into a char variable, after skipping any leading whitespace characters, the extraction operator&raquo_space; finds and stores only the next character; reading stops after a single character.
A) True
B) False

Answer 13

True

Question 14

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

cout &laquo_space;fixed &laquo_space;showpoint;
cout &laquo_space;setprecision(2);
cout &laquo_space;x &laquo_space;’ ‘ &laquo_space;y &laquo_space;’ ‘ &laquo_space;z &laquo_space;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

Answer 14

C) 25.67 356.88 7623.97

Question 15

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

A) True
B) False

Answer 15

True

Question 16

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&raquo_space; x&raquo_space; ch&raquo_space; 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 16

D

Question 17

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’

Answer 17

‘B’

Question 18

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&raquo_space; x&raquo_space; y&raquo_space; 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 18

A) x = 28, y = 32, z = 0.6

Question 19

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

cout &laquo_space;fixed &laquo_space;showpoint;
cout &laquo_space;setprecision(3);
cout &laquo_space;x &laquo_space;’ ‘ &laquo_space;y &laquo_space;’ ‘ &laquo_space;setprecision(2) &laquo_space;z &laquo_space;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

Answer 19

A) 55.680 476.859 23.82

Question 20

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&raquo_space; x&raquo_space; y&raquo_space; 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

Answer 20

C) x = 15, y = 76.3, z = 14

Question 21

Using a mathematical library function without including the preprocessor statement #include <cmath> is a common programming error in C++.</cmath>

A) True
B) False

Answer 21

True

Question 22

When a manipulator requiring an argument is used, the ____ header file must be included as part of the program.

A) istream

B) iostream

C) ostream

D) iomanip

Answer 22

D) iomanip

Question 23

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&raquo_space; x&raquo_space; ch&raquo_space; 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.

​

Answer 23

​A) x = 15, ch = ‘A’, y = 73.2

Question 24

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

A) True
B) False

Answer 24

False

Question 25

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

Answer 25

C) 1565.683 85.7800 123.98

Question 26

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? ​ 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

Answer 26

A) ch1 = 'A', ch2 = ' ', alpha = 18

Question 27

The operator used to force converting a value to another type is the ____ operator. A) binary B) single C) logical D) cast

Answer 27

cast

Question 28

Assignment statements can be used to perform arithmetic computations. A) True B) False

Answer 28

True

Question 29

When the ++ operator appears before a variable it’s called a(n) ____ increment operator. A) suffix B) prefix C) postfix D) infix

Answer 29

B) Prefix

Question 30

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? ​ cin >> alpha; cin >> ch; ​ A) alpha = 17, ch = ' ' B) alpha = 1, ch = 7 C) alpha = 17, ch = 'A' D) alpha = 17, ch = 'a'

Answer 30

C) alpha = 17, ch = 'A'

Question 31

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

Answer 31

not x or y

Question 32

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

Answer 32

ignore

Question 33

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 33

A) ch = '2', x = 76