Deck 4: Making Decisions

Question 1

It is illegal to use a block to contain a single statement.

Answer 1

False

Question 2

The non-conditional Boolean logical inclusive OR operator is written as ____.

A) |
B) &&
C) &
D) ||

Answer 2

A

Question 3

In a decision structure, the if expression that precedes a block is called the ____ statement.

A) sequence
B) conditional
C) K & R
D) control

Answer 3

D

Question 4

Flowchart creators use diamond shapes to indicate alternative courses of action.

Question 5

In C#, a ____ is a collection of one or more statements contained within a pair of curly braces.

A) switch
B) block
C) sequence structure
D) decision structure

Question 6

You can use the conditional ____ operator when you want some action to occur even if only one of two conditions is true .

A) AND
B) OR
C) XOR
D) NOT

Question 7

In a switch statement, the keyword ____ starts the switch structure.

A) if
B) case
C) break
D) switch

Question 8

A(n) ____ statement is used to make a single-alternative decision.

A) switch
B) fork
C) if
D) if-else

Question 9

You can use the conditional ____ operator within a Boolean expression to determine whether two expressions are both true .

A) OR
B) AND
C) XOR
D) NOT

Question 10

The non-conditional Boolean logical AND operator is written as ____.

A) &&
B) |
C) &
D) ||

Question 11

The expressions in each part of a compound, conditional Boolean expression are evaluated only as much as necessary to determine whether the entire expression is true or false . This feature is called ____ evaluation.

A) sequential
B) sequence
C) smart
D) short-circuit

Question 12

When if-else statements are nested, each else is always paired with the most recent unpaired if .

Question 13

A ____ structure involves choosing between alternative courses of action based on some value within a program.

A) decision
B) sequence
C) literal
D) fixed

Question 14

You can combine as many AND and OR operators in an expression as needed.

Question 15

The conditional AND operator is written as ____.

A) ||
B) |
C) &&
D) &

Question 16

The conditional OR operator is written as ____.

A) &
B) |
C) &&
D) ||

Question 17

In a switch statement, the keyword return usually terminates each case.

Question 18

When creating a flowchart or pseudocode representation of a task, a ____ structure is one in which one step follows another unconditionally.

A) single-decision
B) dual-decision
C) branched
D) sequence

Question 19

If you have a dual-alternative decision (you want to perform one action when a Boolean expression evaluates as true and an alternate action when it evaluates as false ), you can use a(n) ____ statement.

A) if-else
B) if
C) switch
D) fork

Question 20

In a switch statement, the keyword ____ is followed by one of the possible values that might equal the switch expression.

A) case
B) default
C) break
D) switch

Question 21

Using a(n) ____ with a switch statement can often be convenient because it can make the meaning of case label values much clearer.

A) if structure
B) OR
C) enumeration
D) conditional AND

Question 22

In a switch statement, the type of the value in a case label is the ____________________ type.

Question 23

A(n) ____________________ is similar to pseudocode, but you write the steps in diagram form, as a series of shapes connected by arrows.

Question 24

Why are all computer decisions true-or-false decisions?

Question 25

Explain why the following code sample does not capture the intent of the request "Make sure if the sales code is not 'A' or 'B', the customer gets a 10% discount". What is the correct if statement?
if (salesCode != 'A' || salesCode != 'B')
discount = 0.10;

Question 26

Describe how short-circuit evaluation works when evaluating compound Boolean expressions. Show an example.

Question 27

The ____________________ structure, an alternative to nested if statements, tests a single variable against a series of exact matches.

Question 28

In C#, the ____ operator is used as an abbreviated version of the if-else statement.

A) switch
B) NOT
C) conditional
D) XOR

Question 29

What is the difference between the conditional AND and OR operators and their logical counterparts? How can incorrect use of the logical operators lead to unintended consequences in your program?

Question 30

Explain (in words) how bonuses are assigned in the following example:
if (saleAmount > 1000)
if (saleAmount
bonus = 100;
else
bonus = 50;

Question 31

The optional keyword ____ is used prior to any action that should occur if the test expression does not match any case.

A) break
B) switch
C) default
D) else

Question 32

List the four keywords used in a switch structure and provide a brief description of each.

Question 33

Programmers often use ____________________, a tool that helps them plan a program's logic by writing plain English statements.

Question 34

What are four of the most frequent errors new programmers make when they first learn to make decisions?

Question 35

The following range-checking code works but is somewhat inefficient. Explain why and show how to revise it to be more efficient.
if (saleAmount >= 1000)
commissionRate = 0.08;
else if (saleAmount >= 500)
commissionRate = 0.06;
else if (saleAmount
commissionRate = 0.05;

Question 36

A(n) ____________________ decision has two possible resulting actions.

Question 37

In C#, an error occurs if you reach the end point of the statement list in a case section. This is known as the ____ rule.

A) no fall through
B) en passant
C) break on end
D) default

Question 38

What is the syntax of the conditional operator? Describe how the operator is used.

Question 39

The conditional operator ?: is a(n) ____ operator.

A) binary
B) ternary
C) unary
D) enumeration

Question 40

The NOT operator is written as ____.

A) &
B) &&
C) $
D) !

Question 42

You write a program in which the user must select whether to receive instructions in English or Spanish. In a console application, you would issue the prompt:
Which language do you prefer? Enter 1 for English or 2 for Spanish >>
The program would accept the user's entry, make a decision, and take appropriate action. How would you commonly handle this decision-making situation in a GUI application?