Chapter 3

Question 1

What is the result of the following Boolean expression, given that x = 5, y = 3, and z = 8?
x < y or z > x (T/F)

Answer 1

false because If (x=5) < (y=3), this is False.
AND = the condition, both must be true.
(z=8) > (x=5), this is True
The whole statement is False because it uses the AND condition not the OR condition.

Question 2

What is the result of the following Boolean expression, given that x = 5, y = 3, and z= 8?
! (x < y or z > x) and y < z (T/F)

Answer 2

False

Why: … First:
NOT = operator #1, this means the value of this expression must be reversed. so…
Second:
[ (x=5) < (y=3), expression 1 is False
Third:
OR = the operator #2, one of these must be true. (z=8) > (x=5) ], expression 2 is True - so far the sub-expression 1, in brackets, is True.

Question 3

Write an if clause to determine whether x is anything other than 10?

Answer 3

if choice !=10:

Question 4

Write an if-else statement that assigns 0 to the variable y if the variable x is less than 10. Otherwise it should assign 99 to the variable y.

Question 5

Write nested decision structures that perform the following: if x is greater than 10 and y is less than 100, display the greater of x and y.

Question 6

Which of the following is the correct if clause to determine whether y is in the range 10 through 50, inclusive?

Question 7

A __________ structure can execute a set of statements only under certain
circumstances

Answer 7

decision

Question 8

A __________ structure provides one alternative path of execution

Answer 8

single alternative decision

Question 9

In pseudocode, the If-Then statement is an example of a _________.

Answer 9

decision structure

Question 10

A(n) _________ expression has a value of either true or false

Answer 10

boolean

Question 11

The symbols >,

Answer 11

relational

Question 12

A(n) _________ structure tests a condition and then takes one path if the condition is true, or another path if the condition is false.

Answer 12

dual alternative decision

Question 13

You use a(n) _________ statement in pseudocode to write a single alternative decision structure.

Answer 13

if-then

Question 14

You use a(n) _________ statement in pseudocode to write a dual alternative decision structure.

Answer 14

If-Then-Else

Question 15

A _________ structure allows you to test the value of a variable or an expression and then use that value to determine which statement or set of statements to execute.

Answer 15

multiple alternative decisions

Question 16

A(n) _________ section of a Select Case statement is branched to, if none of the case values match the expression listed after the Select statement.

Answer 16

default

Question 17

AND, OR, and NOT are _________ operators.

Answer 17

logical

Question 18

A compound Boolean expression created with the _________ operator is true only if both of its subexpressions are true.

Answer 18

AND

Question 19

A compound Boolean expression created with the _________ operator is true if either of its subexpressions is true.

Answer 19

OR

Question 20

The _________ operator takes a Boolean expression as its operand and reverses its logical value.

Answer 20

NOT

Question 21

A _________ is a Boolean variable that signals when some condition exists in the program.

Answer 21

flag