Deck 4: Making Decisions

Question 1

The C++ ________ operator represents logical AND.

A) ++
B) )AND.
C) ||
D) &
E) &&

Answer 1

E

Question 2

Relational operators allow you to ________ numbers.

A) add
B) multiply
C) compare
D) average
E) verify

Answer 2

C

Question 3

Which of the following correctly declares an enumerated data type named student?

A) enum student { Bill, Tom, Mary };
B) enum student { "Bill", "Tom", "Mary" };
C) int Bill = 1, Tom = 2, Mary = 3; enum student { 1, 2, 3 };
D) Any of the above 3 methods will work.
E) None of the above 3 methods will work.

Answer 3

A

Question 4

To check if a variable has a particular value, use the = relational operator, as in the statement
if (s = 3)
cout << "S has the value 3";

Question 5

Assuming goodData is a Boolean variable, the following two tests are logically equivalent.
if (goodData == false)
if (!goodData)

Question 6

In C++ when a relational expression is false, it has the value

A) 1.
B) 0.
C) -1.
D) "0".
E) of any negative number.

Question 7

The ________ statement executes one block of statements if a test condition is True, and another block if the condition is false.

A) if
B) if/else
C) if/else if
D) switch
E) trailing else

Question 8

A pair of characters or a pair of string objects can be compared with any of the relational operators.

Question 9

All of the relational operators are binary.

Question 10

logical operators AND and OR have a higher precedence than the NOT operator.

Question 11

The ________ operator takes an operand and reverses its truth or falsehood.

A) relational
B) &&
C) ||
D) !
E) !=

Question 12

If the sub-expression on the left side of an || operator is True, the expression on the right side will not be checked.

Question 13

A(n) ________ is a variable, usually a bool, that signals when a condition exists.

A) flag
B) identifier
C) named constant
D) condition variable
E) logical variable

Question 14

If a switch statement has no ________ statements, the program "falls through" all of the statements below the one with the matching case expression.

A) break
B) exit
C) case
D) default
E) relational

Question 15

A trailing else placed at the end of an if/else if statement provides a default action when ________ of the if conditions is/are True.

A) none
B) any one
C) only the last one
D) at least two
E) all

Question 16

The statement
pass = (score >= 7) ?
True : false;
does exactly the same thing as the if/else statement below:
if (score >= 7)
pass = True;
else
pass = false;

Question 17

The rule for matching an else with an if is that an else goes with the last if statement before it that doesn't have its own else.

Question 18

When an if statement is placed within the conditionally-executed code of another if statement, this is known as a(n)

A) complex if
B) overloaded if
C) nested if
D) conditional if
E) double if

Question 19

The ________ statement causes other program statements to execute only under certain conditions.

A) logical
B) relational
C) cin
D) cout
E) if

Question 20

The following C++ test checks if the variable child is in the range 3 to 12.
if (child >= 3 || child <= 12)

Question 21

The ________ operator is used in C++ to test for equality.

A) =
B) <>
C) &&
D) ==
E) ||

Question 22

Assuming moreData is a Boolean variable, the following two tests are logically equivalent.
if (moreData == True)
if (moreData)

Question 23

A flag is a variable, usually of data type ________, that signals whether or not some condition exists.

A) char
B) string
C) int
D) bool
E) logical

Question 24

The following C++ test checks if the variable child is in the range 3 - 12.
if (child >= 3 && <= 12)

Question 25

What will the following statement do if x equals 17 and answer = 20?
Answer = x > 100 ?
0 : 1;

A) Assign 0 to answer.
B) Assign 0 to x.
C) Assign 1 to answer.
D) Assign 1 to x.
E) Assign 17 to answer.

Question 26

The default section of a switch statement performs a similar task as the ________ portion of an if/else if statement.

A) conditional test
B) break
C) trailing else
D) else if
E) body

Question 27

If s1 and s2 are string objects, s1 == s2 is True when

A) s1 = "lion" and s2 = "lioness".
B) s1 = "dog" and s2 = "DOG".
C) s1 = "cat" and s2 = "cat ".
D) None of these because in each case one or more characters in the strings have different ASCII codes.
E) None of these because string objects cannot be compared with relational operators.

Question 28

When a program lets the user know that an invalid menu choice has been made, this is an example of

A) input validation.
B) output validation.
C) menu reselection.
D) invalidation.
E) being user unfriendly.

Question 29

The scope of a variable is the program it is defined in.

Question 30

The ________ statement acts like a chain of if statements. Each performs its test, one after the other, until one of them is found to be True or until the construct is exited without any test ever evaluating to True.

A) if/then
B) if/else
C) if/else if
D) if/not if
E) if/endif

Question 31

The expression x < y is called a(n) ________ expression.

A) arithmetic
B) logical
C) relational
D) comparison
E) binary

Question 32

Relational operators connect two or more relational expressions into one, or reverse the logic of an expression.

Question 33

The following statements will not print anything.
x = 5;
if (x < 5)
cout << "Hello ";
cout << "world \n";

Question 34

What will the following expression evaluate to?
!( 6 > 7 || 3 == 4)

A) 0
B) -1
C) 6
D) True
E) false

Question 35

The ________ statement executes one statement, or block of statements, if a condition is True and skips it, doing nothing, if the condition is false.

A) if
B) if/else
C) if/else if
D) switch
E) if/endif

Question 36

The ________ operator is known as the logical OR operator.

A) !
B) &
C) &&
D) ||
E) //

Question 37

A switch statement branches to a particular block of code depending on the value of a numeric (i.e. integer or floating-point) variable or constant.

Question 38

If the sub-expression on the left side of an && operator is True, the expression on the right side will not be checked.

Question 39

Relational expressions and logical expressions are both Boolean, which means they evaluate to True or false.

Question 40

An expression in a C++ if statement that evaluates to 5, -5, or for that matter anything other than 0, is considered True.