Deck 15: Making Decisions

Question 1

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

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

Answer 1

A

Question 2

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

Answer 2

True

Question 3

What character(s) function as the non-conditional Boolean logical inclusive OR operator?

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

Answer 3

A

Question 4

In a situation where you want to perform one action when a Boolean expression evaluates as true and an alternate action when it evaluates as false, otherwise known as a dual-alternative decision, what sort of statement should you use?

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

Question 5

What character(s) function as the conditional OR operator in the C# programming language?

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

Question 6

When creating a flowchart or pseudocode representation of a task, what type of structure is one in which one step follows another unconditionally?

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

Question 7

What character(s) function as the non-conditional Boolean logical AND operator in the C# programming language?

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

Question 8

What sort of evaluation involves the evaluation of expressions in each part of a compound, conditional Boolean expression only as much as necessary to determine whether the expression is false?

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

Question 9

What should you use if you wish to execute two or more statements conditionally?

A) A switch statement.
B) A block enclosed within a pair of curly braces.
C) A defined sequence structure.
D) A declared decision structure.

Question 10

When using a switch structure to make decisions within a program, what keyword is used to begin the structure?

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

Question 11

What type of statement can be used to make a single-alternative decision?

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

Question 12

What conditional operator can be used when you want some action to occur even if only one of two given conditions is true?

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

Question 13

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

Question 14

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

Question 15

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

Question 16

What type of structure involves choosing between alternative courses of action based on some value within a program?

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

Question 17

What character(s) do you use to make a conditional AND operator within a C# program?

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

Question 18

What conditional operator can be used to create a compound Boolean expression as an alternative to if statements?

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

Question 19

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

Question 20

The if expression that precedes a block in a decision structure is known as what type of statement?

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

Question 21

What character(s) serve as the NOT operator in the C# programming language?

A) &
B) &&
C) <>
D) !

Question 22

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 23

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?

Question 24

What kind of conditional operator requires three arguments: a test expression, and true and false result expressions?

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

Question 25

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

Question 26

What can be used in conjunction with a switch statement in order to make the meaning of case label values much clearer?

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

Question 27

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

Question 28

What rule results in an error if you reach the end point of a statement list in a case section?

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

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

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

Question 31

When the & and | operators are used between Boolean expressions, they are Boolean logical operators.What are they when used between integer expressions?

A) integral operators
B) numerical operators
C) bitwise operators
D) arithmetic operators

Question 32

When designing a flowchart for assisting in the coding process, what is a parallelogram typically used to represent?

A) They usually represent errors that should occur when provided invalid data.
B) They usually represent a declaration of a value.
C) They usually represent decision blocks.
D) They usually represent input and output statements.

Question 33

Explain (in words) how bonuses are assigned in the following example:
if(saleAmount > 1000)
if(saleAmount < 2000)
bonus = 100;
else
bonus = 50;

Question 34

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

Question 35

Placing the opening brace of an if block on the same line as the if statement is known as what style of programming?

A) K & R style
B) Allman style
C) GNU style
D) Haskell style

Question 36

What character(s) are used to form the ternary conditional operator in C#?

A) ?:
B) ?;
C) !:
D) ?

Question 37

What keyword can you use to specify an action to take in the event that a test expression does not match any case?

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

Question 38

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 <= 499)
commissionRate = 0.05;

Question 39

In C#, what operator is used as an abbreviated version of the if-else statement, and requires three expressions separated with a question mark and a colon?

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

Question 40

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