Currently the quiz does not inform players about grading scale. As such they have no way ascertaining how they are doing until the game ends and their grades are displayed. Modify the game so that the player has the option of reading about the grade scale.

#--------------------------------------------------------------------------

#

# Script Name: SupermanQuiz.rb

# Version: 1.0

# Author: Jerry Lee Ford, Jr.

# Date: March 2010

#

# Description: This Ruby script demonstrates how to work with loops when

# collecting user input through the creation of an

# interactive quiz that evaluates the players knowledge of

# the Superman movie series.

#

#--------------------------------------------------------------------------

# Define custom classes ---------------------------------------------------

#Define a class representing the console window

class Screen

def cls #Define a method that clears the display area

puts (" " * 25) #Scroll the screen 25 times

puts "\a" #Make a little noise to get the player's attention

end

def pause #Define a method that pauses the display area

STDIN.gets #Execute the STDIN class's gets method to pause script

#execution until the player presses the Enter key

end

end

#Define a class representing the Superman Movie Trivia Quiz

class Quiz

#This method displays the quiz's opening screen

def display_greeting

Console_Screen.cls #Clear the display area

#Display welcome message

print "\t\t Welcome to the Superman Movie Trivia Quiz!" +

" Press Enter to " +

"continue."

Console_Screen.pause #Pause the game

end

#Define a method to be used to present quiz instructions

def display_instructions

Console_Screen.cls #Clear the display area

puts "INSTRUCTIONS: " #Display a heading

#Display the game's instructions

puts "You will be presented with a series of multiple-choice"

puts "questions. To answer a question, type in the letter of"

puts "the corresponding answer and press the Enter key. Your"

puts "grade will be displayed at the end of the test. "

puts "Good luck! "

print "Press Enter to continue."

Console_Screen.pause #Pause the game

end

#Define a method to be used to present and process quiz questions

def disp_q(question, q_A, q_B, q_C, q_D, answer)

#Loop until the player inputs a valid answer

loop do

Console_Screen.cls #Clear the display area

#Format the display of the quiz question

puts question + " "

puts q_A

puts q_B

puts q_C

puts q_D

print " Type the letter representing your answer: "

reply = STDIN.gets #Collect the player's answer

reply.chop! #Remove the end of line marker

#Analyze the player's input to determine if it is correct

if answer == reply then

#Keep track of the number of correctly answered questions

$noRight += 1

end

#Analyze the answer to determine if it was valid

if reply == "a" or reply == "b" or reply == "c" or reply == "d" then

break #Terminate the execution of the loop

end

end

end

#Define a method to be used to grade and display quiz results

def determine_grade

Console_Screen.cls #Clear the display area

#To pass the test, the player must correctly answer at least 3 questions

if $noRight >= 6 then

#Inform the player of the good news and assign a ranking

print "You correctly answered " + $noRight.to_s + " question(s). "

puts "You have passed the Superman Movie Trivia Quiz! "

puts "You have earned a rank of: Good Citizen" if $noRight == 3

puts "You have earned a rank of: Side Kick" if $noRight == 4

puts "You have earned a rank of: Superhero" if $noRight == 5

print " Press Enter to continue."

else #The player has failed the quiz

#Inform the player of the bad news

print "You missed " + (5 - $noRight).to_s + " questions. "

puts "You have failed the Superman Movie Trivia Quiz."

puts "\t\t\tURL: http://en.wikipedia.org/wiki/Superman_movies "

puts "retake the quiz."

print " Press Enter to continue."

end

Console_Screen.pause #Pause the game

end

#This method displays the information about the Superman Movie Trivia Quiz

def display_credits

Console_Screen.cls #Clear the display area

#Thank the player and display game information

puts "\t\tThank you for taking the SUPERMAN MOVIE TRIVIA QUIZ. "

puts " \t\t\t Developed by Jerry Lee Ford, Jr. "

puts "\t\t\t\t Copyright 2010 "

puts "\t\t\tURL: http://www.tech-publishing.com "

end

end

# Main Script Logic -------------------------------------------------------

#Initialize global variable that will be used to keep track of the number

#of correctly answered quiz questions

$noRight = 0

Console_Screen = Screen.new #Instantiate a new Screen object

SQ = Quiz.new #Instantiate a new Quiz object

#Execute the Quiz class's display_greeting method

SQ.display_greeting

answer = ""

#Loop until the player enters y or n and do not accept any other input.

loop do

Console_Screen.cls #Clear the display area

#Prompt the player for permission to start the quiz

print "Are you ready to take the quiz? (y/n): "

answer = STDIN.gets #Collect the player's response

answer.chop! #Remove one character from the end of the string

break if answer == "y" || answer == "n"

end

#Analyze the player's input

if answer == "n" #See if the player elected not to take the quiz

Console_Screen.cls #Clear the display area

#Invite the player to return and take the quiz some other time

puts "Okay, perhaps another time. "

#Display credits when player elects to not play display_credits method

SQ.display_credits

else #The player wants to take the quiz

#Execute the Quiz class's display_instructions method

SQ.display_instructions

#Execute the Quiz class's disp_q method and pass it

#arguments representing a question, possible answers and the letter

#of the correct answer

SQ.disp_q("What is the name of the Daily Planet's ace photographer?",

"a. Jimmy Olsen", "b. Clark Kent", "c. Lex Luthor", "d. Lois Lane",

"a")

#Call upon the disp_q method and pass it the second question

SQ.disp_q("What is the name of Clark Kent's home town?",

"a. Metropolis", "b. Gotham City", "c. Smallville", "d. New York",

"c")

#Call upon the disp_q method and pass it the third question

SQ.disp_q("In which movie did Superman battle General Zod?",

"a. Superman", "b. Superman II", "c. Superman III", "d. Superman IV",

"b")

#Call upon the disp_q method and pass it the fourth question

SQ.disp_q("What is the name of Superman's father?",

"a. Nimo", "b. Jarrell", "c. Lex Luthor", "d. Krypton",

"b")

#Call upon the disp_q method and pass it the fifth question

SQ.disp_q("Where had Superman been at the start of 'Superman Returns'?",

"a. Moon", "b. Fortress of Solitude", "c. Earth's Core", "d. Krypton",

"d")

#Call upon the disp_q method and pass it the sixth question

SQ.disp_q("What is the name of the Daily Planet's ace photographer?",

"a. Jimmy Olsen", "b. Clark Kent", "c. Lex Luthor", "d. Lois Lane",

"a")

#Call upon the disp_q method and pass it the seventh question

SQ.disp_q("What is the name of Clark Kent's home town?",

"a. Metropolis", "b. Gotham City", "c. Smallville", "d. New York",

"c")

#Call upon the disp_q method and pass it the eighth question

SQ.disp_q("In which movie did Superman battle General Zod?",

"a. Superman", "b. Superman II", "c. Superman III", "d. Superman IV",

"b")

#Call upon the disp_q method and pass it the nineth question

SQ.disp_q("What is the name of Superman's father?",

"a. Nimo", "b. Jarrell", "c. Lex Luthor", "d. Krypton",

"b")

#Call upon the disp_q method and pass it the tenth question

SQ.disp_q("Where had Superman been at the start of 'Superman Returns'?",

"a. Moon", "b. Fortress of Solitude", "c. Earth's Core", "d. Krypton",

"d")

#Call upon the Quiz class's determine_grade method to display

#the player's grade and assigned rank

SQ.determine_grade

#Call upon the Quiz class's display_credits method to thank

#the player for taking the quiz and to display game information

SQ.display_credits

end