Deck 3: Expressions and Interactivity

Question 1

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

Answer 1

E

Question 2

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

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

Answer 2

E

Question 3

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

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

Answer 3

B

Question 4

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

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

Question 5

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

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

Question 6

can be used to override the rules of operator precedence.

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

Question 7

Which of the following expressions will evaluate to 2.5?

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

Question 8

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

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

Question 9

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

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

Question 10

The object causes data to be input from the keyboard.

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

Question 11

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

Question 12

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

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

Question 13

The following 4 lines of C++ code, use strings. Which of the following statements is /are true?

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

Question 14

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

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

Question 15

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

Question 16

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

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

Question 17

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

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

Question 18

Hand tracing a program is

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

Question 19

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

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

Question 20

The cin object must be followed by

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

Question 21

The setw manipulator is used to set the precision of a number.

Question 22

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

Question 23

Operator associativity is either left to right or

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

Question 24

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 25

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

Question 26

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

Question 27

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

Question 28

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

Question 29

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

Question 30

The following two statements will assign the same value to result.

Question 31

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

Question 32

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

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

Question 33

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

Question 34

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

Question 35

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

Question 36

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

Question 37

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 38

The operator always follows the cin object, and the operator follows the cout object.
A)^<< , ^>>

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

Question 39

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

Question 40

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