Deck 3: Expressions and Interactivity

Question 1

The ________ operator always follows the cin object, and the ________ operator follows the cout object.

A) input, endl
B) getChar, printChar
C) >> , <<
D) >> , >>
E) << , >>

Answer 1

C

Question 2

________ can be used to override the rules of operator precedence.

A) Some operators
B) Parentheses
C) Operands
D) Associativity
E) Nothing

Answer 2

B

Question 3

The following pair of C++ statements is legal.
const double taxRate;
taxRate = .05;

Answer 3

False

Question 4

In any program that uses the cin object, you must #include

A) the iostream header file.
B) the fstream header file.
C) >> and << operators.
D) named constants.
E) none of the above.

Question 5

The cin object can be used to input more than one value in a single statement.

Question 6

Which of the following statements doubles the value stored in answer?

A) answer += 2;
B) answer *= 2;
C) answer = answer * 2;
D) All three of the above
E) Both B and C, but not A

Question 7

When the final value of an expression is assigned to a variable, it will be converted to

A) the smallest possible data type.
B) the largest possible data type.
C) the data type of the variable.
D) the data type of the expression.
E) none of the above.

Question 8

________ causes a program to wait until information is typed at the keyboard and the Enter key is pressed.

A) An input device
B) The cin object
C) The cout object
D) A preprocessor
E) Nothing

Question 9

The only difference between C-strings and string objects is how they are declared and internally stored. They are used exactly the same way.

Question 10

The following two statements will assign the same value to result.
result = a + b * c;
result = b * c + a;

Question 11

Which of the following statements will assign number a value from 90 - 100.

A) number = rand() % 90 + 10;
B) number = rand() % 90 + 11;
C) number = rand() % 10 + 90;
D) number = rand() % 11 + 90;
E) None of the above.

Question 12

Which of the following expressions will evaluate to 2.5?

A) static_cast(5/2)
B) static_cast(5)/2
C) 5/static_cast(2)
D) All three of the above
E) Both B and C, but not A

Question 13

Program code that can be evaluated to a value is called a(n)

A) operation.
B) line.
C) evaluator.
D) result.
E) expression.

Question 14

The ________ stream manipulator can be used to establish a field width for the value immediately following it.

A) cin
B) setField
C) setw
D) iomanip
E) width

Question 15

The following C++ statement will assign 1.5 to the result variable.
int result = 3.0 / 2.0;

Question 16

Hand tracing a program is

A) a program design technique.
B) a program run-time testing technique.
C) a program debugging technique.
D) creating a drawing of what a program's output screen will look like.
E) none of the above.

Question 17

Which of the following will allow an entire line of text to be read into a string object, even if it contains embedded blanks?

A) getline()
B) cin >>
C) cin.get()
D) cin.ignore()
E) both A and B, but not C or D.

Question 18

In C++, a value can be raised to a power by using

A) the ^ operator.
B) the exp operator.
C) the power operator.
D) the pow function.
E) the square function.

Question 19

When an operator's operands are of different data types, such as int and double, C++ automatically converts one of them so that they are the same data type.

Question 20

To use stream manipulators, you should include the ________ header file.

A) stream
B) fstream
C) format
D) iomanip
E) iostream

Question 21

The statement cout << setw(4) << num4 << " ";

A) outputs the value of num4 rounded to 4 decimal places.
B) outputs "setw(4)" before the value in the variable num4.
C) outputs the first 4 digits of the number stored in num4.
D) outputs the value stored in num4 four times.
E) does none of above.

Question 22

The following statement sets sum1, sum2, and sum3 all to zero.
sum1 = sum2 = sum3 = 0;

Question 23

When a C++ expression is evaluated, binary operations are performed before unary operations.

Question 24

The following two expressions evaluate to the same thing:
c + a * b
c + (a * b)

Question 25

The cin object lets the user enter a string that contains embedded blanks.

Question 26

If the value of dollars is 5.0, the following statement will output 5.00 to the monitor:
cout << fixed << showpoint << setprecision(4) << dollars << endl;

Question 27

In C++, the 5 basic arithmetic operators are
addition (+), subtraction (-), multiplication (*), division (/), and exponentiation (^).

Question 28

The following 4 lines of C++ code, use strings. string firstName; // Define a string object
Char lastName[7]; // Define a C-string
FirstName = "Abraham"; // Assign a value to the string object
LastName = "Lincoln"; // Assign a value to the C-string
Which of the following statements is /are True?

A) The string object is defined incorrectly because no size is given for it.
B) The 2 string definitions are correct, but the 2 assignment statements are wrong.
C) The string object is assigned a value correctly, but the C-string is not.
D) The C-string is assigned a value correctly, but the string object is not.
E) All 4 lines of code are correct.

Question 29

Operator associativity is either left to right or

A) top to bottom.
B) front to back.
C) right to left.
D) inside to outside.
E) nothing else; it is always left to right.

Question 30

The following pair of C++ statements will cause 3.5 to be output.
double number = 7 / 2;
cout << number;

Question 31

When converting some algebraic expressions to C++, you may need to insert ________ and ________ that do not appear in the algebraic expression.

A) values, exponents
B) operators, calculations
C) operators, operands
D) operators, parentheses
E) operands, parentheses

Question 32

The following statement sets the value of total to -3.
total -= 3;

Question 33

The ________ object causes data to be input from the keyboard.

A) cin
B) cout
C) keyboard buffer
D) standard input
E) dataIn

Question 34

To use the sqrt() function, or other mathematical library functions, you must #include the ________ header file in your program.

A) iostream
B) iomanip
C) cmath
D) algebra
E) mathlib

Question 35

Which of the following statements about named constants is/are True?

A) A named constant must be initialized with a value at the time it is declared.
B) The identifier name of a named constant can only contain capital letters and underscores.
C) The initial value of a named constant, cannot be changed during the program execution.
D) All 3 of the above statements are True.
E) Statements A and C are True, but B is not.

Question 36

When an operator has two operands of different data types, C++ always converts them both to double before performing the operation.

Question 37

The cin object must be followed by

A) a single stream insertion (<<) operator.
B) one or more stream insertion operators (<<).
C) a single stream extraction (>>) operator.
D) one or more stream extraction (>>) operators.
E) no operators.

Question 38

When an arithmetic expression contains two or more different operators, such as * and +, the order in which the operations is done is determined by

A) left to right order.
B) operator precedence.
C) operator associativity.
D) the programmer.
E) the compiler.

Question 39

The following statement number = rand() % 5 + 10;
Assigns number a value in the range of

A) 5 - 10
B) 0 - 15
C) 5 - 15
D) 10 - 15
E) none of the above.

Question 40

What does the following C++ expression evaluate to?
6 - 6 / 3 + 3

A) 0
B) 3
C) 5
D) 7
E) None of the above