Question 1

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

Accepted Answer

The code uses an "if modifier," which is a concise way to write an if statement in Ruby, placing the condition after the statement to be executed.

Question 2

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

Accepted Answer

Ruby supports both "and" and "&&" for logical AND operations and both "||" and "or" for logical OR operations. Therefore, the correct answer is D, which includes all the options.

Question 3

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 ____.

Accepted Answer

Nesting involves using multiple conditional modifiers or expressions within a single statement, allowing for more complex conditional testing. Concatenation involves combining multiple strings or variables into a single string or variable. Ternary analysis involves using a shorthand syntax to perform a conditional test and return one of two values based on the result of the test. None of these options fully address the need for more complex conditional testing.

Question 4

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

Accepted Answer

There is no limitation as to how deeply you can next conditional statements in any programming language, including Ruby.

Question 5

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

Accepted Answer

Case blocks are versatile in many programming languages, allowing for the analysis of not just numeric data but strings and other types as well. They typically have a default or else branch to handle cases where no when statements match, preventing errors from occurring in such situations. Additionally, the syntax of case blocks and their comparison to if expressions varies by language, but the statement about substituting the when keyword with the : character is not a recognized limitation of case blocks in general.

Question 6

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

Accepted Answer

The "and" operator is the most similar to the "&&" operator. Both operators require that both conditions being compared are true in order for the result to be true. The "or" operator (represented by "||") only requires one of the conditions to be true, and the "not" operator (represented by "!") negates the value of the condition. Therefore, "and" is the most similar operator to "&&".

Question 7

Which of the following statements best describes the Ternary operator?

Accepted Answer

The Ternary operator does not specifically match any of the descriptions given in options A, B, or C. It is actually a conditional operator that takes three operands: a condition followed by a question mark (?), then an expression to execute if the condition is true followed by a colon (:), and finally the expression to execute if the condition is false.

Question 8

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

Accepted Answer

The advantages listed in options A, B, and C are all true and accurate, so none of them are exceptions. Therefore, the correct answer is D, which indicates that all of the advantages listed in the question are true.

Question 9

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

Accepted Answer

The or operator has a higher level of precedence than the || operator. This means that if both operators are used in the same expression, the or operator will be evaluated first.

Quiz 4: Implementing Conditional Logic