WGU C949 Data Types STUDY GUIDE
and answers
ArrayA data structure that stores an ordered list of items, with each item is
directly accessible by a positional index.
Linked ListA data structure that stores ordered list of items in nodes, where each
node stores data and has a pointer to ...
WGU C949 Data Structures &
Algorithms Chapters 1-4 questions and
answers
In-line, Multiline, Documentation Strings (Docstrings)✔✔In Python, there are three
(3) different types of commenting styles. What are they?
In-line✔✔"Comments used to add meaning to a program and explain logic in-line
with the code being discussed. These comments are good for quick explanations
and are indicated by using the # character and a space. if n % 2 == 1: # n is odd"
Multiline✔✔"Comments, also known as block comments, are good for more in-depth
explanations or when you want to comment a complex section of code. In Python we
append together a section of lines all beginning with the # character to achieve this.
# This section of code # Requires a longer comment # So we can add as many lines
as needed"
Document Strings (Docstrings)✔✔"These are used like the comments referenced
above but it allows you much more space to write a longer message and they can be
written out at runtime, which means the interpreter does see them, unlike other types
of comments. These should be used to describe what a piece of code is doing in
detail. You enclose these types of comments in three quote marks """""".
def odd_function(n)✔✔""""""This function checks to see whether a number is odd or
even"""""""
Computer program✔✔Consists of instructions that a computer executes (or runs),
like multiplying numbers or printing a number to a screen.
Task decomposition✔✔Means to reduce a complex task into simpler basic steps,
making the whole task easier to solve.
Algorithm✔✔Is a methodical step-by-step procedure to perform a task.
Computational thinking✔✔The method of evaluating a problem's most basic parts
and then creating an algorithm to solve that problem.
Python interpreter✔✔For Python, an application that can be used on various
operating systems, including Microsoft Windows, Linux, and MacOS.
Interactive interpreter✔✔A program that allows the user to execute one line of code
at a time.
Code (Coding)✔✔A common word for the textual representation of a program.
Line✔✔A row of text.
,The interactive interpreter displays a prompt(">>>")✔✔(">>>") that indicates the
interpreter is ready to accept code.
Prompt✔✔Informs the programmer that the interpreter is ready to accept commands.
statement✔✔A program instruction.
True✔✔True or false. A program mostly consists of a series of statements, each
statement usually appears on its own line.
Expression✔✔Code that returns a value when evaluated; for example, the code
wage * hours * weeks is an expression that computes a number. * is the symbol for
multiplication. The names wage, hours, weeks, and salary are variables, which are
named references to values stored by the interpreter.
assignment✔✔A new variable is created by performing an ___________ using the =
symbol, such as salary = wage * hours * weeks, which creates a new variable called
salary.
print()✔✔Displays variables or expression values.
comments✔✔#' characters denote ____________, which are optional but can be
used to explain portions of code to a human reader.
print()✔✔The primary way to print output is to us the built-in function _________.
string literal✔✔Text enclosed in quotes is known as a ...
False✔✔True or False. Text in string literals may not have letters, numbers, spaces,
or symbols like "@" or "#".
print('Hello', end = ' ')✔✔Multiple print statements will each print on a new output line.
How would you keep the next print's output on the same line separated by a single
space?
True✔✔True or False. A string literal can be surrounded by matching single or
double quotes: 'Python rocks!' or "Python rocks!". Good practice is to use single
quotes for shorter strings, and double quotes for more complicated text or text that
contains single quotes (such as print("Don't eat that!")).
"print('Halt!', end = ' ') print('No access!')"✔✔Write code that will print "Halt!" and "No
access!" on a single line.
print('Welcome!')✔✔Write code that will print: Welcome!
print(num_cars)✔✔Given the variable num_cars = 9, write a statement that prints 9.
, "wage = 20 print('Wage:' , wage) #Comma separates multiple items
print('Goodbye.')"✔✔"Write code that prints the following: Wage: 20 Goodbye."
You are 22 years old.✔✔"Assume variable age = 22 What is the output of print('You
are' , age, 'years old.')"
newline character✔✔A new line can also be output by inserting \n, known as a
______________ ___________, within a string literal.
input()✔✔Reading input is achieved using the ________ function.
num_cars = input()✔✔Write a statement that reads a user-entered string into
variable num_cars.
type✔✔Determines how a value can behave.
my_var = int('15')✔✔Type a statement that converts the string '15' to an integer, and
assigns the result to my_var.
my_var + 5✔✔"Complete the code so that new_var is equal to the entered number
plus 5. my_var = int(input()) new_var = _______"
syntax error✔✔A type of error that violates a programming language's rules on how
symbols can be combined to create a program.
runtime error✔✔A type of error wherein a program's syntax is correct but the
program attempts an impossible operation, such as dividing by zero or multiplying
strings together (like 'Hello' * 'ABC').
crash✔✔Abrupt and unintended termination of a program.
SyntaxError✔✔The program contains invalid code that can not be understood.
IndentationError✔✔The lines of the program are not properly indented.
ValueError✔✔An invalid value is used - can occur if giving letters to int().
NameError✔✔The program tries to use a variable that does not exist.
TypeError✔✔An operation uses incorrect types - can occur if adding an integer to a
string.
TypeError✔✔What type of error: lyric = 99 + "" bottles of pop on the wall"""
IndentationError✔✔What type of error: print(""Friday, Friday"")"
ValueError✔✔What type of error: int(""Thursday"")"
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