The game lets players know whether their guesses are too high or too low. It also rejects any guesses outside of its supported range of numbers, such as negative numbers, numbers greater than 1000, or alphabetic or special characters. Modify the game so that it notifies players when invalid guesses have been made and reminds players of what constitutes valid input. To implement this change, modify the Game classs play_game method so that it clears the screen, displays an error message, and then pauses the game to ensure that players see the message before continuin

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# 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 Ruby Number Guessing Game

class Game

#This method displays the game's opening screen

def display_greeting

Console_Screen.cls #Clear the display area

#Display welcome message

print "\t\t Welcome to the Ruby Number Guessing Game!" +

" Press Enter to " +

"continue."

Console_Screen.pause #Pause the game

end

#Define a method to be used to present game instructions

def display_instructions

Console_Screen.cls #Clear the display area

puts "INSTRUCTIONS: " #Display a heading

#Display the game's instructions

puts "This game randomly generates a number from 1 to 1000 and"

puts "challenges you to identify it in as few guesses as possible."

puts "After each guess, the game will analyze your input and provide"

puts "you with feedback. You may take as many turns as you need in"

puts "order to guess the game's secret number. "

puts "Good luck! "

print "Press Enter to continue."

Console_Screen.pause #Pause the game

end

#Define a method that generates the game's secret number

def generate_number

#Generate and return a random number between 1 and 100

return randomNo = 1 + rand(1000)

end

#Define a method to be used control game play

def play_game

#Call on the generate_number method in order to get a random number

number = generate_number

#Loop until the player inputs a valid answer

loop do

Console_Screen.cls #Clear the display area

#Prompt the player to make a guess

print " Enter your guess and press the Enter key: "

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

reply.chop! #Remove the end of line character

reply = reply.to_i #Convert the player's guess to an integer

#Validate the player's input only allowing guesses between 1 and 100

if reply < 1 or reply > 100 then

redo #Redo the current iteration of the loop

end

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

if reply == number then #The player's guess was correct

Console_Screen.cls #Clear the display area

print "You have guessed the number! Press enter to continue."

Console_Screen.pause #Pause the game

break #Exit loop

elsif reply < number then #The player's guess was too low

Console_Screen.cls #Clear the display area

print "Your guess is too low! Press Enter to continue."

Console_Screen.pause #Pause the game

elsif reply > number then #The player's guess was too high

Console_Screen.cls #Clear the display area

print "Your guess is too high! Press Enter to continue."

Console_Screen.pause #Pause the game

end

end

end

#This method displays the information about the Ruby Number Guessing Game

def display_credits

Console_Screen.cls #Clear the display area

#Thank the player and display game information

puts "\t\tThank you playing the Ruby Number Guessing Game. "

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 -------------------------------------------------------

Console_Screen = Screen.new #Instantiate a new Screen object

SQ = Game.new #Instantiate a new Game object

#Execute the Game 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 game

print "Are you ready to play the Ruby Number Guessing Game? (y/n): "

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

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

#Terminate the loop if valid input was provided

break if answer == "y" || answer == "n" #Exit loop

end

#Analyze the player's input

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

Console_Screen.cls #Clear the display area

#Invite the player to return and play the game some other time

puts "Okay, perhaps another time. "

else #The player wants to play the game

#Execute the Game class's display_instructions method

SQ.display_instructions

loop do

#Execute the Game class's play_game method

SQ.play_game

Console_Screen.cls #Clear the display area

#Prompt the player for permission start a new round of play

print "Would you like to play again? (y/n): "

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

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

break if playAgain == "n" #Exit loop

end

#Call upon the Game class's determine_credits method in order to thank

#the player for playing the game and to display game information

SQ.display_credits

end