Comp Sci Unit 2 #4

The variable age is to be used to represent a person’s age, in years. Which of the following is the most appropriate data type for age ?

• Boolean

• number

• string

• list

Directions: The question or incomplete statement below is followed by four suggested answers or completions. Select the one that is best in each case.

The code segment below is intended to swap the values of the variables first and second using a temporary variable, temp .

Which of the following can be used to replace <MISSING CODE> so that the code segment works as intended?

• 
• 
• 
• 

Consider the following program, which uses the variables start, end, and current.

What is displayed as a result of executing the program?

• 1 3

• 3 3

• 3 4

• 4 4

Directions: For the question or incomplete statement below, two of the suggested answers are correct. For this question, you must select both correct choices to earn credit. No partial credit will be earned if only one correct choice is selected. Select the two that are best in each case.

Which of the following are benefits of using well-named variables in a computer program?

Select two answers.

• The program will run faster.

• The program will be easier for people to read.

• The program will have a greater data storage capacity.

• The program will be easier to modify in the future.

Assume that the variables alpha and beta each are initialized with a numeric value. Which of the following code segments can be used to interchange the values of alpha and beta using the temporary variable temp ?

• I and II only

• 
  I and III only

• II and III only

• I, II, and III

Consider the following code segment, which uses the variables r, s, and t.

r ← 1

s ← 2

t ← 3

r ← s

s ← t

DISPLAY (r)

DISPLAY (s)

What is displayed as a result of running the code segment?

• 1 1

• 1 2

• 2 3

• 3 2

The variable is Open is to be used to indicate whether or not a store is currently open. Which of the following is the most appropriate data type for is Open ?

• Boolean

• 
  number

• 
  string

• list

Consider the following code segment.

What is the value of r as a result of executing the code segment?

• 10

• 20

• 30

• 40

A code segment will be used to swap the values of the variables a and b using the temporary variable temp.

Which of the following code segments correctly swaps the values of a and b?

• 
• 
• 
• 

A teacher is writing a code segment that will use variables to represent a student’s name and whether or not the student is currently absent. Which of the following variables are most appropriate for the code segment?

• A string variable named s and a Boolean variable named a

• A string variable named s and a numeric variable named n

• A string variable named studentName and a Boolean variable named isAbsent

• A string variable named studentName and a numeric variable named numAbsences