Deck 4: Implementing Conditional Logic

Question 1

You can use conditional modifiers to group and control the execution of one or more statements, making your scripts easier to read and maintain.

Answer 1

False

Question 2

A key point to understanding conditional programming logic is that it hinges on whether a condition is evaluated as true or false.

Answer 2

True

Question 3

Unlike if modifiers, if expressions are limited to controlling the execution of a single statement at a time.

Answer 3

False

Question 4

To save a few keystrokes, Ruby allows programmers to replace the when keyword with the : character when formulating a conditional statement using an if expression.

Question 5

The if modifier is attached to the end of a Ruby statement in order to conditionally control its execution.

Question 6

Conditional expressions provide the ability to append a conditional check to the beginning of Ruby statements in order to control the conditional execution of the statement.

Question 7

The if expression is a conditional evaluation appended to the end of Ruby statements to conditionally control the execution of the statement.

Question 8

The unless modifier is the logical opposite of the if modifier.

Question 9

else is an optional keyword that permits the execution of an alternate set of statements in the event a tested condition evaluates as false.

Question 10

The unless expression is used to create complex conditional evaluations spread out over multiple lines that perform the opposite type of evaluation as an if expression.

Question 11

The exit method is provided by the kernel class. It forces the immediate termination of a Ruby script.

Question 12

Using Ruby, you can create scripts that consist of a series of statements that are executed in sequential order. However, these scripts are often not suited to complex tasks.

Question 13

The Case statement is a conditional evaluation that performs a series of conditional tests, each of which is compared to a single value.

Question 14

Flowcharts provide a visual representation of the overall logic involved in creating some or all of a computer program or script.

Question 15

The unless modifier is a conditional evaluation appended to the end of Ruby statements that performs the opposite type of evaluation as the if modifier.

Question 16

The elsif keyword permits the evaluation of additional conditional tests when working with an if statement code block.

Question 17

Conditional Logic describes the process of executing sets of code statements based on the whether or not a tested condition proves true.

Question 18

The Ternary Operator is an operator that facilitates the inclusion of a conditional expression within another statement

Question 19

You can modify an if modifier to execute one or more statements in the event the test condition evaluates as being false. To accomplish this, you need to add the optional else keyword.

Question 20

The if modifier is used to create complex conditional evaluations spread out over multiple lines.

Question 21

Nesting works just as effectively with unless expressions as it does with if expressions.

Question 22

Both the = and the == operators can be used to evaluate two expressions or value in order to determine if they are equal.

Question 23

Flowcharts are often used in large projects in order to ____.

A) Coordinate the efforts of multiple programmers working on the same project.
B) To clearly delineate different parts of a program or script.
C) To ensure that a programmer has an understanding of how the part of the project he is assigned fits into the overall scheme.
D) All of the above

Question 24

To determine if two values are not equal, which comparison operator should be used?

A) ==
B) !=
C) >=
D) !

Question 25

The unless expression is the polar opposite of the if expression.

Question 26

What happens if none of the when statements in a case code block match the value of the expression that is evaluated?

A) The statements belonging to the else statement (if present) are executed
B) The last when statements belonging to the last when statement is executed
C) All of the statements belonging to the when statements are executed
D) None of the above

Question 27

Which of the following is true regarding case code blocks?

A) If more than one expression evaluates as true, both of its associated statements are executed
B) If more than one expression evaluates as true, the last matching expression is evaluated
C) The first expression that evaluates as true is executed and the rest of the statements are skipped
D) None of the above

Question 28

To determine if one value is greater than or equal to another, which comparison operator should be used?

A) ==
B) >=
C) ==
D) !=

Question 29

In most cases, it takes ____ lines of code to set up a case block when compared to an if expression that contains multiple elseif keywords.

A) More
B) Fewer
C) the same number of
D) None of the above

Question 30

Ruby provides access to a number of conditional expressions, modifiers, and logical operators that can be used to ____.

A) Compare different values
B) Control the logical execution of different script statements
C) Create Ruby scripts capable of altering their execution based on the data that they are presented with
D) All of the above.

Question 31

Like other modern programming languages, Ruby provides programmers with access to a range of comparison operators, not including ____.

A) ==
B) !=
C) >=
D) =

Question 32

Which of the following is the ternary operator?

A) #
B) #!
C) ?:
D) None of the above

Question 33

The between? method can be used to perform which of the following tasks?

A) Returns a value or true or false depending on whether a number equals a specified value
B) Returns a value of true or false depending on whether or not a number is within a specified range
C) Returns a value of true or false depending on whether or not a value is numeric
D) None of the above

Question 34

The advantages of appending conditional modifiers to the end of script statements include ____.

A) It helps in the development of compact statements
B) It can help reduce the overall size of script files
C) It provides fine tuned control over the execution of individual statements
D) All of the above

Question 35

An if statement code block begins with the if keyword and ends with what keyword?

A) end
B) exit
C) endif
D) None of the above

Question 36

The case block provides programmers with the ability to ____.

A) Compare a series of expressions against a single expression
B) Compare a single expression against another expression
C) Compare numeric values but not string values
D) None of the above

Question 37

Which of the following is not true about flowcharts?

A) A flowchart is a tool used to graphically represent some or all of a script's logical flow.
B) Flowcharts are created by programmers to outline the overall design of the logic involved in a computer program or script prior to beginning work on it.
C) Flowcharts provide a statement by statement outline of all of the programming logic that makes up a computer program or script.
D) None of the above

Question 38

The case block evaluates an expression that is compared to values associated with one or more when statements.

Question 39

Ruby provides programmers with access to several ways of applying conditional logic, including all of the following except ____.

A) The switch modifier
B) The unless modifier
C) The Case statement
D) The if expression

Question 40

A case block is well suited to situations where you need to compare a single value to a whole range of possible matches.

Question 41

The following example is an example of what type of conditional evaluation? print "Enter your age and press Enter: " answer = STDIN.gets answer.chop! puts "You must be 18 or older to play this game!" if answer.to_i

A) if expression
B) Ternary operator
C) if modifier
D) None of the above

Question 42

Ruby supports the use of a number of logical or Boolean operators, including which of the following?

A) and
B) &&
C) ||
D) All of the above

Question 43

Some situations require a more complicated analysis than can be accomplished using an single conditional modifier or expression. One way of performing more complex conditional testing is through a processing called ____.

A) Nesting
B) Concatenation
C) Ternary analysis
D) None of the above

Question 44

Which of the following is true when it comes to nesting conditional statements?

A) Ruby limits nesting to a maximum of three levels
B) Nesting is available only when working with if expressions
C) There is no limitation as to how deeply you can next conditional statements
D) None of the above

Question 45

Which of the following is a limitation of the case blocks?

A) They are limited to the analysis of numeric data
B) They generate an error if no when statements match the tested expression
C) Unlike the if expression, case blocks do not allow you to substitute the when keyword with the : character
D) None of the above

Question 46

Which of the following logical (Boolean) operators is most similar to the && operator?

A) and
B) ||
C) !
D) None of the above

Question 47

Which of the following statements best describes the Ternary operator?

A) It compares a series of values against a single value
B) It is attached to the end of a statement in order to conditional control the statements execution.
C) It is used nest one of more conditional statements.
D) None of the above

Question 48

Advantages of the if and unless expressions include all of the following except?

A) They allow you to control the execution of one or more code statements
B) They can help improve the organization of scripts and make them easier to read and maintain
C) They can be used to work with any type of value supported by Ruby
D) None of the above

Question 49

What is the difference between the or and the || operators?

A) There is no difference between these two operators
B) The || operator has a higher level of precedence
C) The or operator has a higher level of precedence
D) None of the above