Deck 4: Making Decisions

Question 1

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

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

Answer 1

B

Question 2

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

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

Answer 2

D

Question 3

Two different variables in the same program may have the same name

A)if they always hold different values.
B)if the second one is never declared.
C)if they have different scope.
D)if the second one is initialized with a different value than the first one.
E)never. A program cannot have two variables with the same name.

Answer 3

C

Question 4

Relational operators allow you to numbers.

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

Question 5

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

Question 6

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

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

Question 7

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

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

Question 8

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

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

Question 9

In C++ when a relational expression is false, it has the value
A)"0".

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

Question 10

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.

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

Question 11

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

A)s1 = "cat" and s2 = "cat ".
B)s1 = "lion" and s2 = "lioness".
C)s1 = "dog" and s2 = "DOG".
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 12

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

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

Question 13

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

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

Question 14

What will the following expression evaluate to?

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

Question 15

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

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

Question 16

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

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

Question 17

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)all
C)any one
D)only the last one
E)at least two

Question 18

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

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

Question 19

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

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

Question 20

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

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

Question 21

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

Question 22

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 23

All of the relational operators are binary.

Question 24

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

Question 25

The following C++ test checks if the variable child is in the range 3- 12.

Question 26

The three logical operators, AND, OR, and NOT, all have the same precedence.

Question 27

The statement

Question 28

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 29

To check if a variable has a particular value, use the = relational operator, as in the statement

Question 30

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

Question 31

The following C++ test checks if the variable child is in the range 3-12.

Question 32

The following statement s will not print anything.

Question 33

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

Question 34

Assuming moreData is a Boolean variable, the following two tests are logically equivalent.

Question 35

In C++ an expression that evaluates to 5, - 5, or for that matter anything other than 0, is considered true by an if statement.

Question 36

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

Question 37

Assuming goodData is a Boolean variable, the following two tests are logically equivalent.