Modify the game so it rejects blank input when the player presses Enter without typing a sentence.

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

#

# Script Name: TypingChallenge.rb

# Version: 1.0

# Author: Jerry Lee Ford, Jr.

# Date: March 2010

#

# Description: This Ruby script demonstrates how to apply conditional logic

# in order to analyze user input and control script execution

# through the development of a computer typing test that

# evaluates the player's typing skills.

#

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

# 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 typing test

class Test

#This method displays the 8-ball greeting message

def display_greeting

Console_Screen.cls #Clear the display area

#Display a welcome screen

print "\t\t Welcome to the Ruby Typing Challenge game!" +

" Press Enter to " +

"continue. : "

Console_Screen.pause #Pause the game

end

#Define a method to be used to present test instructions

def display_instructions

Console_Screen.cls #Clear the display area

puts "\t\t\tInstructions: " #Display a heading

#Display the game's instructions

puts %Q{ This test consists of a series of 10 typing challenges.

The challenge sentences are presented one at a time. To respond

correctly, you must retype each sentence exactly as shown and press

the Enter key. Your grade will be displayed at the end of the test.

Grading format: 9 or better sentences typed correctly will result in an 'A',

8 sentences typed correctly will result in a 'B',

7 sentences typed correctly will result in a 'C',

6 sentences typed correctly will result in a 'D',

less than 6 will result in an 'F'!

Press Enter to continue. }

Console_Screen.pause #Pause the game

end

#Define a method to be used to present typing challenges

def present_test(challenge)

Console_Screen.cls #Clear the display area

print challenge + " : " #Display the challenge sentence

result = STDIN.gets #Collect the player's input

result.chop! #Remove the end of line marker

#Analyze the player input and see if it is correct

if challenge == result then

#Keep track of the number of correctly retyped challenge sentences

$noRight += 1

Console_Screen.cls #Clear the display area

#Keep the player informed

print "Correct! Press Enter to continue."

Console_Screen.pause #Pause the game

else

Console_Screen.cls #Clear the display area

#Keep the player informed

print "Incorrect! Press Enter to continue."

Console_Screen.pause #Clear the game

end

end

#Define a method to be used to display test results

def determine_grade

Console_Screen.cls #Clear the display area

#To pass the test the player must correctly retype 6 sentences

if $noRight >= 6 then

#Inform the player of the good news

print "You retyped " + $noRight.to_s + " sentence(s) correctly. "

puts "You have passed the typing test! Press Enter to continue."

else #The player has failed the test

#Inform the player of the bad news

print "You retyped " + $noRight.to_s + " sentence(s) correctly. "

puts "You have failed the typing test! Press Enter to continue."

end

# Grading Sytem for the Challenge

letter Grade = case $noRight

when 9..10 then "A"

when 8 then "B"

when 7 then "C"

when 6 then "D"

else "F"

end

end

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

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

#of correctly retyped sentences

$noRight = 0

Console_Screen = Screen.new #Instantiate a new Screen object

Typing_Test = Test.new #Instantiate a new Test object

#Execute the Test object's display_greeting method

Typing_Test.display_greeting

#Execute the Screen object's cls method in order to clear the screen

Console_Screen.cls

#Prompt the player for permission to begin the test

print "Would you like to test your typing skills? (y/n) : "

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

answer.chop! #Remove any extra characters appended to the string

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

until answer == "y" || answer == "n"

Console_Screen.cls #Clear the display area

#Prompt the player for permission to begin the test

print "Would you like to test your typing skills? (y/n) : "

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

answer.chop! #Remove any extra characters appended to the string

end

#Analyze the player's response

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

Console_Screen.cls #Clear the display area

#Invite the player to return and play again

puts "Okay, perhaps another time. "

else #The player wants to take the test

#Execute the Test object's display_instructions method

Typing_Test.display_instructions

#Display typing challenges and grade each answer by calling on the

#Test object's present_test method

Typing_Test.present_test "In the end there can be only one."

Typing_Test.present_test "Once a great plague swept across the land."

Typing_Test.present_test "Welcome to Ruby Principles of Ruby Programming"

Typing_Test.present_test "There are very few problems in the world " +

"that enough M&Ms cannot fix."

Typing_Test.present_test "Perhaps today is a good day to die. Fight " +

"beside me and let us die together."

Typing_Test.present_test "Don't cry because it's over, smile because it happened"

Typing_Test.present_test "Be yourself; everyone else is already taken."

Typing_Test.present_test "So many books, so little time."

Typing_Test.present_test "A room without books is like a body without a soul."

Typing_Test.present_test "You know you're in love when you can't fall asleep because reality is finally better than your dreams."

#Notify the player of the results by executing the Test object's

#display_instructions method

Typing_Test.determine_grade

Console_Screen.pause #Pause the game

Console_Screen.cls #Clear the display area

#Thank the player for taking the typing test

puts "Thank you for taking the Ruby Typing Challenge. "

end