WGU University WGU-SPF Online Practice Questions and Exam Preparation

WGU University WGU-SPF Online Questions & Answers

• Question 31:

  Which expression evaluates to true when integer x = 10?

  A. x % 2 != 0
  B. x / 2 = 3
  C. x % 2 == 0
  D. x < 0
  C. x % 2 == 0

  ---

  The modulus operator (%) returns the remainder of division. When x = 10, x % 2 equals 0, indicating that 10 is evenly divisible by 2. Therefore, the expression x % 2 == 0 evaluates to true.

• Question 32:

  Which phase of the waterfall model focuses on writing the actual program code?

  A. Analysis
  B. Design
  C. Implementation
  D. Testing
  C. Implementation

  ---

  The implementation phase of the waterfall model is where the design specifications are translated into working code. During this phase, programmers write the source code that implements the planned functionality of the system.

• Question 33:

  In a while loop, what is essential to prevent an infinite loop?

  A. A print statement
  B. An update to the loop variable
  C. A return statement
  D. A break statement
  B. An update to the loop variable

  ---

  Updating the loop variable is crucial to avoid infinite loops.

• Question 34:

  Which type of error occurs when a program produces incorrect results but still runs?

  A. Syntax error
  B. Runtime error
  C. Logic error
  D. Compilation error
  C. Logic error

  ---

  A logic error occurs when the program executes without crashing but produces incorrect output due to flawed logic. These errors are often difficult to detect because the program appears to function normally.

• Question 35:

  What is the PRIMARY purpose of declaring a variable before using it?

  A. To improve program speed
  B. To reserve memory and define the data type
  C. To eliminate logical errors
  D. To execute the program
  B. To reserve memory and define the data type

  ---

  Declaring a variable reserves memory and defines the type of data the variable can store. This allows the program to manage data correctly and prevents type-related errors during execution.

• Question 36:

  What is an argument?

  A. A piece of information provided in a function call
  B. A declared piece of information within a function
  C. A piece of information assigned to a function's output
  D. An input named in the definition of a function
  A. A piece of information provided in a function call

  ---

  In programming, an argument is a value that is passed to a function when it is called. The function can then use that information within its scope as it runs. Arguments are often used interchangeably with parameters, but they refer to the actual values provided to the function, while parameters are the variable names listed in the function's definition that receive the argument values12.

  For example, consider a function calculateSum that takes two arguments, a and b:

  Python

  def calculateSum(a, b):

  return a + b

  # Here, 5 and 3 are arguments provided in the function call.

  result = calculateSum(5, 3)

  AI-generated code. Review and use carefully. More info on FAQ. In this case, 5 and 3 are the arguments provided in the function call to calculateSum. They are not declared within the function (option B), not assigned to the function's output (option C), nor are they inputs named in the definition of the function (option D). Instead, they are pieces of information provided during the function call, which aligns with option A.

  References:

  iD Tech's explanation of arguments in programming. Programming Fundamentals' discussion on parameters and arguments.

• Question 37:

  Which function is used to get user input in Python 3?

  A. scanf()
  B. input()
  C. get()
  D. read()
  B. input()

  ---

  Explanation

  input() is used to capture user input as a string in Python 3.

• Question 38:

  What is the purpose of an activity diagram, such as the following diagram?

  

  A. Describes the execution flow of the PrintPositive activity
  B. Specifics the program's components that must be present
  C. Visualizes the program's data values
  D. Specifies the program's behavioral requirements
  A. Describes the execution flow of the PrintPositive activity

  ---

  Activity diagrams are another type of UML diagram used to model the workflow or flow of control within a system.

  They visually represent the steps performed by a system to complete a specific activity.

  They use a set of symbols, including rounded rectangles for activities, diamonds for decisions, and arrows to show the flow between steps.

  The activity diagram shows the workflow of a process called "PrintPositive". It starts with a single initial state (represented by a black circle) labeled "Get Input". There's a decision diamond labeled "Negative?" with two paths. Both paths end with a black circle labeled "End".

  How it describes the execution flow:

  The diagram indicates that the process starts by getting some input. Then, there's a decision made based on whether the input is negative.

  If it's negative, the value is negated.

  In either case (positive or negative), the output is printed.

  Finally, the process ends.

  Summary:

  The activity diagram captures the steps involved in the "PrintPositive" activity, including the decision-making process and the alternative paths based on the input. This aligns with the purpose of describing the execution flow.

• Question 39:

  Which programming library benefit allows developers to avoid rewriting common functionality?

  A. Increased hardware speed
  B. Reduced need for variables
  C. Code reuse
  D. Elimination of testing
  C. Code reuse

  ---

  Programming libraries provide prewritten, reusable code for common tasks. This enables developers to reuse existing solutions instead of writing the same functionality from scratch, improving productivity and reducing errors. Libraries do not eliminate testing or hardware limitations.

• Question 40:

  What is a characteristic of an interpreted language?

  A. Is restricted to running on one machine
  B. Generates syntax errors during compilation
  C. Can be run by a user one statement at a time
  D. Has a programmer writing machine code
  C. Can be run by a user one statement at a time

  ---

  Interpreted languages are designed to be executed one statement at a time by an interpreter. This allows for immediate execution and feedback, which is useful for debugging and interactive use. Unlike compiled languages, interpreted languages do not generate machine code prior to execution, and they do not produce syntax errors during compilation because there is no compilation step. They are not restricted to one machine, as the interpreter can be implemented on various systems, and they do not

  require the programmer to write machine code.

  References:

  The characteristics of interpreted languages are discussed in educational resources such as "Programming Language Pragmatics" by Michael L. Scott and "The Art of Computer Programming" by Donald E. Knuth. These texts explain the execution model of interpreted languages and contrast it with that of compiled languages.