add exercise 1 to 44

ex10.rb

+tabby_cat = "\tI'm tabbed in."
+persian_cat = "I'm split\non a line."
+backslash_cat = "I'm \\ a \\ cat."
+
+fat_cat = """
+I'll do a list:
+\t* Cat food
+\t* Fishies
+\t* Catnip\n\t* Grass
+"""
+
+puts tabby_cat
+puts persian_cat
+puts backslash_cat
+puts fat_cat
\ No newline at end of file

ex11.rb

+print "How old are you? "
+age = gets.chomp
+print "How tall are you? "
+height = gets.chomp
+print "How much do you weigh? "
+weight = gets.chomp
+
+puts "So, you're #{age} old, #{height} tall and #{weight} heavy."
\ No newline at end of file

ex12.rb

+print "Give me a number: "
+number = gets.chomp.to_i
+
+bigger = number * 100
+puts "A bigger number is #{bigger}."
+
+print "Give me another number: "
+another = gets.chomp
+number = another.to_i
+
+smaller = number / 100
+puts "A smaller number is #{smaller}."
\ No newline at end of file

ex13.rb

+first, second, third = ARGV
+
+puts "Your first variable is: #{first}"
+puts "Your second variable is: #{second}"
+puts "Your third variable is: #{third}"
\ No newline at end of file

ex14.rb

+user_name = ARGV.first # gets the first argument
+prompt = '> '
+
+puts "Hi #{user_name}."
+puts "I'd like to ask you a few questions."
+puts "Do you like me #{user_name}? "
+puts prompt
+likes = $stdin.gets.chomp
+
+puts "Where do you live #{user_name}? "
+puts prompt
+lives = $stdin.gets.chomp
+
+# a comma for puts is like using it twice
+puts "What kind of computer do you have? ", prompt
+computer = $stdin.gets.chomp
+
+puts """
+Alright, so you said #{likes} about liking me.
+You live in #{lives}.  Not sure where that is.
+And you have a #{computer} computer.  Nice.
+"""
\ No newline at end of file

ex15.rb

+filename = ARGV.first
+
+txt = open(filename)
+
+puts "Here's your file #{filename}:"
+print txt.read
+
+print "Type the filename again: "
+file_again = $stdin.gets.chomp
+
+txt_again = open(file_again)
+
+print txt_again.read
\ No newline at end of file

ex16.rb

+filename = ARGV.first
+
+puts "We're going to erase #{filename}"
+puts "If you don't want that, hit CTRL-C (^C)."
+puts "If you do want that, hit RETURN."
+
+$stdin.gets
+
+puts "Opening the file..."
+target = open(filename, 'w')
+
+puts "Truncating the file.  Goodbye!"
+target.truncate(0)
+
+puts "Now I'm going to ask you for three lines."
+
+print "line 1: "
+line1 = $stdin.gets.chomp
+print "line 2: "
+line2 = $stdin.gets.chomp
+print "line 3: "
+line3 = $stdin.gets.chomp
+
+puts "I'm going to write these to the file."
+
+target.write(line1)
+target.write("\n")
+target.write(line2)
+target.write("\n")
+target.write(line3)
+target.write("\n")
+
+puts "And finally, we close it."
+target.close
\ No newline at end of file

ex17.rb

+from_file, to_file = ARGV
+
+puts "Copying from #{from_file} to #{to_file}"
+
+# we could do these two on one line, how?
+in_file = open(from_file)
+indata = in_file.read
+
+puts "The input file is #{indata.length} bytes long"
+
+puts "Does the output file exist? #{File.exist?(to_file)}"
+puts "Ready, hit RETURN to continue, CTRL-C to abort."
+$stdin.gets
+
+out_file = open(to_file, 'w')
+out_file.write(indata)
+
+puts "Alright, all done."
+
+out_file.close
+in_file.close
\ No newline at end of file

ex18.rb

+def cheese_and_crackers(cheese_count, boxes_of_crackers)
+  puts "You have #{cheese_count} cheeses!"
+  puts "You have #{boxes_of_crackers} boxes of crackers!"
+  puts "Man that's enough for a party!"
+  puts "Get a blanket.\n"
+end
+
+
+puts "We can just give the function numbers directly:"
+cheese_and_crackers(20, 30)
+
+
+puts "OR, we can use variables from our script:"
+amount_of_cheese = 10
+amount_of_crackers = 50
+
+cheese_and_crackers(amount_of_cheese, amount_of_crackers)
+
+
+puts "We can even do math inside too:"
+cheese_and_crackers(10 + 20, 5 + 6)
+
+
+puts "And we can combine the two, variables and math:"
+cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)
\ No newline at end of file

ex19.rb

+def cheese_and_crackers(cheese_count, boxes_of_crackers)
+  puts "You have #{cheese_count} cheeses!"
+  puts "You have #{boxes_of_crackers} boxes of crackers!"
+  puts "Man that's enough for a party!"
+  puts "Get a blanket.\n"
+end
+
+
+puts "We can just give the function numbers directly:"
+cheese_and_crackers(20, 30)
+
+
+puts "OR, we can use variables from our script:"
+amount_of_cheese = 10
+amount_of_crackers = 50
+
+cheese_and_crackers(amount_of_cheese, amount_of_crackers)
+
+
+puts "We can even do math inside too:"
+cheese_and_crackers(10 + 20, 5 + 6)
+
+
+puts "And we can combine the two, variables and math:"
+cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)
\ No newline at end of file

ex2.rb

+# A comment, this is so you can read your program later.
+# Anything after the # is ignored by ruby.
+
+puts "I could have code like this." # and the comment after is ignored
+
+# You can also use a comment to "disable" or comment out a piece of code:
+# puts "This won't run."
+
+puts "This will run."
+

ex20.rb

+input_file = ARGV.first
+
+def print_all(f)
+  puts f.read
+end
+
+def rewind(f)
+  f.seek(0)
+end
+
+def print_a_line(line_count, f)
+  puts "#{line_count}, #{f.gets.chomp}"
+end
+
+current_file = open(input_file)
+
+puts "First let's print the whole file:\n"
+
+print_all(current_file)
+
+puts "Now let's rewind, kind of like a tape."
+
+rewind(current_file)
+
+puts "Let's print three lines:"
+
+current_line = 1
+print_a_line(current_line, current_file)
+
+current_line = current_line + 1
+print_a_line(current_line, current_file)
+
+current_line = current_line + 1
+print_a_line(current_line, current_file)
\ No newline at end of file

ex21.rb

+def add(a, b)
+  puts "ADDING #{a} + #{b}"
+  return a + b
+end
+
+def subtract(a, b)
+  puts "SUBTRACTING #{a} - #{b}"
+  return a - b
+end
+
+def multiply(a, b)
+  puts "MULTIPLYING #{a} * #{b}"
+  return a * b
+end
+
+def divide(a, b)
+  puts "DIVIDING #{a} / #{b}"
+  return a / b
+end
+
+
+puts "Let's do some math with just functions!"
+
+age = add(30, 5)
+height = subtract(78, 4)
+weight = multiply(90, 2)
+iq = divide(100, 2)
+
+puts "Age: #{age}, Height: #{height}, Weight: #{weight}, IQ: #{iq}"
+
+
+# A puzzle for the extra credit, type it in anyway.
+puts "Here is a puzzle."
+
+what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
+
+puts "That becomes: #{what}. Can you do it by hand?"
\ No newline at end of file

ex24.rb

+puts "Let's practice everything."
+puts 'You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.'
+
+# the <<END is a "heredoc". See the Student Questions.
+poem = <<END
+\tThe lovely world
+with logic so firmly planted
+cannot discern \n the needs of love
+nor comprehend passion from intuition
+and requires an explanation
+\n\t\twhere there is none.
+END
+
+puts "--------------"
+puts poem
+puts "--------------"
+
+
+five = 10 - 2 + 3 - 6
+puts "This should be five: #{five}"
+
+def secret_formula(started)
+  jelly_beans = started * 500
+  jars = jelly_beans / 1000
+  crates = jars / 100
+  return jelly_beans, jars, crates
+end
+
+
+start_point = 10000
+beans, jars, crates = secret_formula(start_point)
+
+puts "With a starting point of: #{start_point}"
+puts "We'd have #{beans} beans, #{jars} jars, and #{crates} crates."
+
+start_point = start_point / 10
+puts "We can also do that this way:"
+puts "We'd have %s beans, %d jars, and %d crates." % secret_formula(start_point)
\ No newline at end of file

ex25.rb

+
+module Ex25
+
+  # This function will break up words for us.
+  def Ex25.break_words(stuff)
+    words = stuff.split(' ')
+    return words
+  end
+
+  # Sorts the words.
+  def Ex25.sort_words(words)
+    return words.sort
+  end
+
+  # Prints the first word after shifting it off.
+  def Ex25.print_first_word(words)
+    word = words.shift
+    puts word
+  end
+
+  # Prints the last word after popping it off.
+  def Ex25.print_last_word(words)
+    word = words.pop
+    puts word
+  end
+
+  # Takes in a full sentence and returns the sorted words.
+  def Ex25.sort_sentence(sentence)
+    words = Ex25.break_words(sentence)
+    return Ex25.sort_words(words)
+  end
+
+  # Prints the first and last words of the sentence.
+  def Ex25.print_first_and_last(sentence)
+    words = Ex25.break_words(sentence)
+    Ex25.print_first_word(words)
+    Ex25.print_last_word(words)
+  end
+
+  # Sorts the words then prints the first and last one.
+  def Ex25.print_first_and_last_sorted(sentence)
+    words = Ex25.sort_sentence(sentence)
+    Ex25.print_first_word(words)
+    Ex25.print_last_word(words)
+  end
+
+end
+
+#  >>> irb
+
+# require "./ex25.rb"
+
+# sentence = "All good things come to those who wait."
+# words = Ex25.break_words(sentence)
+# words
+# sorted_words = Ex25.sort_words(words)
+# sorted_words
+# Ex25.print_first_word(words)
+# Ex25.print_last_word(words)
+# words
+# Ex25.print_first_word(sorted_words)
+# Ex25.print_last_word(sorted_words)
+# sorted_words
+# sorted_words = Ex25.sort_sentence(sentence)
+# sorted_words
+# Ex25.print_first_and_last(sentence)
+# Ex25.print_first_and_last_sorted(sentence)
\ No newline at end of file

ex26.rb

+module Ex25
+
+  # This function will break up words for us.
+  def Ex25.break_words(stuff)
+    words = stuff.split(' ')
+    return words
+  end
+
+  # Sorts the words.
+  def Ex25.sort_words(words)
+    return words.sort
+  end
+
+  # Prints the first word after popping it off.
+  def Ex25.print_first_word(words)
+    word = words.shift
+    puts word
+  end
+
+  # Prints the last word after popping it off.
+  def Ex25.print_last_word(words)
+    word = words.pop
+    puts word
+  end
+
+  # Takes in a full sentence and returns the sorted words.
+  def Ex25.sort_sentence(sentence)
+    words = Ex25.break_words(sentence)
+    return Ex25.sort_words(words)
+  end
+
+  # Prints the first and last words of the sentence.
+  def Ex25.print_first_and_last(sentence)
+    words = Ex25.break_words(sentence)
+    Ex25.print_first_word(words)
+    Ex25.print_last_word(words)
+  end
+
+  # Sorts the words then prints the first and last one.
+  def Ex25.print_first_and_last_sorted(sentence)
+    words = Ex25.sort_sentence(sentence)
+    Ex25.print_first_word(words)
+    Ex25.print_last_word(words)
+  end
+end
+
+
+
+puts "Let's practice everything."
+puts 'You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.'
+
+poem = <<END
+\tThe lovely world
+with logic so firmly planted
+cannot discern \n the needs of love
+nor comprehend passion from intuition
+and requires an explanation
+\n\t\twhere there is none.
+END
+
+puts "--------------"
+puts poem
+puts "--------------"
+
+
+five = 10 - 2 + 3 - 6
+puts "This should be five: #{five}"
+
+def secret_formula(started)
+  jelly_beans = started * 500
+  jars = jelly_beans / 1000
+  crate = jars / 100
+  return jelly_beans, jars, crate
+end
+
+
+start_point = 10000
+beans, jars, crates = secret_formula(start_point)
+
+puts "With a starting point of: #{start_point}"
+puts "We'd have #{beans}, #{jars} jars, and #{crates} crates."
+
+start_point = start_point / 10
+puts "we can also do that this way:"
+puts "We'd have %s beans, %d jars and %d crates." % secret_formula(start_point)
+
+sentence = "All good things come to those who wait."
+
+words = Ex25.break_words(sentence)
+sorted_words = Ex25.sort_words(words)
+
+Ex25.print_first_word(words)
+Ex25.print_last_word(words)
+Ex25.print_first_word(sorted_words)
+Ex25.print_last_word(sorted_words)
+# sorted_words = Ex25.sort_sentence(sentence)
+Ex25.print_first_and_last(sentence)
+Ex25.print_first_and_last_sorted(sentence)
\ No newline at end of file

ex27.rb

+# NOT	    true?
+# !false	true
+# !true	    false
+
+# OR (||)	        true?
+# true || false	    true
+# true || true	    true
+# false || true	    true
+# false || false	false
+
+# AND (&&)	        true?
+# true && false	    false
+# true && true	    true
+# false && true	    false
+# false && false	false
+
+# NOT OR	                true?
+# not (true || false)	    false
+# not (true || true)	    false
+# not (false || true)	    false
+# not (false || false)	    true
+
+# NOT AND	true?
+# !(true && false)	true
+# !(true && true)	false
+# !(false && true)	true
+# !(false && false)	true
+
+# !=	    true?
+# 1 != 0	true
+# 1 != 1	false
+# 0 != 1	true
+# 0 != 0	false
+
+# ==	    true?
+# 1 == 0	false
+# 1 == 1	true
+# 0 == 1	false
+# 0 == 0	true
\ No newline at end of file

ex28.rb

+# true && true
+# false && true
+# 1 == 1 && 2 == 1
+# "test" == "test"
+# 1 == 1 || 2 != 1
+# true && 1 == 1
+# false && 0 != 0
+# true || 1 == 1
+# "test" == "testing"
+# 1 != 0 && 2 == 1
+# "test" != "testing"
+# "test" == 1
+# !(true && false)
+# !(1 == 1 && 0 != 1)
+# !(10 == 1 || 1000 == 1000)
+# !(1 != 10 || 3 == 4)
+# !("testing" == "testing" && "Zed" == "Cool Guy")
+# 1 == 1 && (!("testing" == 1 || 1 == 0))
+# "chunky" == "bacon" && (!(3 == 4 || 3 == 3))
+# 3 == 3 && (!("testing" == "testing" || "Ruby" == "Fun"))
\ No newline at end of file

ex29.rb

+people = 20000
+cats = 30
+dogs = 15
+
+
+if people < cats
+  puts "Too many cats! The world is doomed!"
+end
+
+if people > cats
+  puts "Not many cats! The world is saved!"
+end
+
+if people < dogs
+  puts "The world is drooled on!"
+end
+
+if people > dogs
+  puts "The world is dry!"
+end
+
+
+dogs += 5
+
+if people >= dogs
+  puts "People are greater than or equal to dogs."
+end
+
+if people <= dogs
+  puts "People are less than or equal to dogs."
+end
+
+
+if people == dogs
+  puts "People are dogs."
+end
\ No newline at end of file

ex3.rb

+puts "I will now count my chickens:"
+
+# phep chia vd 10 / 3 = 3 
+# muon co phan thap phan thi 10.0 / 3 hoac 10/3.0 = 3.3333
+puts "Hens #{25 + 30 / 6}"
+puts "Roosters #{100 - 25 * 3 % 4}"
+
+
+puts "Now I will count the eggs:"
+
+puts 3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6
+
+puts "Is it true that 3 + 2 < 5 - 7?"
+
+puts 3 + 2 < 5 - 7
+
+puts "What is 3 + 2? #{3 + 2}"
+puts "What is 5 - 7? #{5 - 7}"
+
+puts "Oh, that's why it's false."
+
+puts "How about some more."
+
+puts "Is it greater? #{5 > -2}"
+puts "Is it greater or equal? #{5 >= -2}"
+puts "Is it less or equal? #{5 <= -2}"
\ No newline at end of file

ex30.rb

+people = 30
+cars = 40
+trucks = 15
+
+
+if cars > people
+  puts "We should take the cars."
+elsif cars < people
+  puts "We should not take the cars."
+else
+  puts "We can't decide."
+end
+
+if trucks > cars
+  puts "That's too many trucks."
+elsif trucks < cars
+  puts "Maybe we could take the trucks."
+else
+  puts "We still can't decide."
+end
+
+if people > trucks
+  puts "Alright, let's just take the trucks."
+else
+  puts "Fine, let's stay home then."
+end
\ No newline at end of file

ex31.rb

+user_name = ARGV.first 
+prompt = ">>>"
+
+puts "welcome #{user_name} to Borderlands"
+puts '-------------------------------'
+puts "You enter the Land of the Dead. There's only one way to survive"
+puts "type 1 to start or if you are scared can escape by typing 2"
+
+print "#{prompt}"
+s1 = $stdin.gets.chomp
+
+if s1 == "1"
+    puts "Meet Surtur!"
+    puts "1. Fight him."
+    puts "2. seek shelter."
+
+    print "#{prompt} "
+    s2 = $stdin.gets.chomp
+
+    if s2 == "1"
+        puts "surtur has been defeated by you"
+        puts "Congratulations. You win"
+    elsif s2 == "2"
+        puts "you have been caught by surtur. YOU DEAD!!!!!!!"
+    else
+        puts "you entered the wrong syntax. YOU DEAD!!!!!!!"
+    end
+   elsif s1 == "2"
+    puts "you are a coward! Surtur has killed you"
+   else 
+    puts "you entered the wrong syntax. YOU DEAD!!!!!!!"
+end

ex32.rb

+#for and each
+
+the_count = [1, 2, 3, 4, 5]
+fruits = ['apples', 'oranges', 'pears', 'apricots']
+change = [1, 'pennies', 2, 'dimes', 3, 'quarters']
+
+# this first kind of for-loop goes through a list
+# in a more traditional style found in other languages
+for number in the_count
+  puts "This is count #{number}"
+end
+
+# same as above, but in a more Ruby style
+# this and the next one are the preferred 
+# way Ruby for-loops are written
+fruits.each do |fruit|
+  puts "A fruit of type: #{fruit}"
+end
+
+# also we can go through mixed lists too
+# note this is yet another style, exactly like above
+# but a different syntax (way to write it).
+change.each {|i| puts "I got #{i}" }
+
+# we can also build lists, first start with an empty one
+elements = []
+
+# then use the range operator to do 0 to 5 counts
+(0..5).each do |i|
+  puts "adding #{i} to the list."
+  # pushes the i variable on the *end* of the list
+  elements.push(i)
+end
+print "elements = #{elements} \n" # print arr khac puts arr
+
+
+# now we can print them out too
+elements.each {|i| puts "Element was: #{i}" }
\ No newline at end of file

ex33.rb

+#while loop
+
+i = 0
+numbers = []
+
+# while i < 6
+#   puts "At the top i is #{i}" # i = i
+#   numbers.push(i)
+
+#   i += 1
+#   puts "Numbers now: ", numbers
+#   puts "At the bottom i is #{i}" # i += 1
+# end
+
+# puts "The numbers: "
+
+# remember you can write this 2 other ways?
+
+# numbers.each {|num| puts num }
+
+(0..5).each do |a| 
+    puts "At the top i is #{a}" # i = i
+    numbers.push(a)
+
+    puts "Numbers now: ", numbers
+    puts "At the bottom i is #{a + 1}" # i += i
+end
\ No newline at end of file

ex34.rb

+animals = ['bear', 'tiger', 'penguin', 'zebra']
+number = ['1', '2', '3', '4', '5']
+students = ['John', 'Hanah', 'Wayne', 'Michael', 'Sarah']
+
+puts "animal index 0 is #{bear = animals[0]}"
+
+def element_of_array (arr)
+    print "Nhap phan tu ban muon lay: "
+    i = $stdin.gets.chomp.to_i
+    
+    if i > arr.length
+        puts "Phan tu vuot qua do dai cua mang"
+    else        
+        puts "phan tu thu #{i} trong mang nay la: #{element = arr[i]}"
+    end    
+    return element
+end
+
+element_of_array(students)
+element_of_array(animals)
\ No newline at end of file

ex35.rb

+def gold_room 
+  puts "This room is full of gold.  How much do you take?"
+
+  print "> "
+  choice = $stdin.gets.chomp
+
+  # this line has a bug, so fix it
+  if choice.to_i.to_s == choice
+    how_much = choice.to_i
+  else
+    dead("Man, learn to type a number.")
+  end
+
+  if how_much < 50
+    puts "Nice, you're not greedy, you win!"
+    exit(0)
+  else
+    dead("You greedy bastard!")
+  end
+end
+
+
+def bear_room
+  puts "There is a bear here."
+  puts "The bear has a bunch of honey."
+  puts "The fat bear is in front of another door."
+  puts "How are you going to move the bear?"
+  bear_moved = false
+
+  while true
+    print "> "
+    choice = $stdin.gets.chomp
+
+    if choice == "take honey" 
+      dead("The bear looks at you then slaps your face off.")
+    elsif choice == "taunt bear" && !bear_moved
+      puts "The bear has moved from the door. You can go through it now."
+      bear_moved = true
+    elsif choice == "taunt bear" && bear_moved
+      dead("The bear gets pissed off and chews your leg off.")
+    elsif choice == "open door" && bear_moved
+      gold_room
+    else
+      puts "I got no idea what that means."
+    end
+  end
+end
+
+
+def cthulhu_room
+  puts "Here you see the great evil Cthulhu."
+  puts "He, it, whatever stares at you and you go insane."
+  puts "Do you flee for your life or eat your head?"
+
+  print "> "
+  choice = $stdin.gets.chomp
+
+  if choice.include? "flee"
+    start
+  elsif choice.include? "head"
+    dead("Well that was tasty!")
+  else
+    cthulhu_room
+  end
+end
+
+
+def dead(why)
+  puts why, "Good job!"
+  exit(0)
+end
+
+def start
+  puts "You are in a dark room."
+  puts "There is a door to your right and left."
+  puts "Which one do you take?"
+
+  print "> "
+  choice = $stdin.gets.chomp
+
+  if choice == "left"
+    bear_room
+  elsif choice == "right"
+    cthulhu_room
+  else
+    dead("You stumble around the room until you starve.")
+  end
+end
+
+# start
+gold_room

ex36.rb

+# create a mini game
+
+def game_over(why)
+  puts why, 'Good job!'
+  exit(0)
+end
+
+def win
+  puts 'Congratulation!!! YOU WIN.'
+  exit(0)
+end
+
+def next_question(question)
+  if question == 'question_1'
+    question_2
+  elsif question == 'question_2'
+    question_3
+  elsif question == 'question_3'
+    question_4
+  elsif question == 'question_4'
+    question_5
+  elsif question == 'question_5'
+    win
+  end
+end
+
+def question_1
+  puts %( Questions 1. Which is not a programming language?
+\tA. Ruby
+\tB. Javascript
+\tC. HTML
+\tD. Python
+    )
+  correct = false
+  while true
+    print '>'
+    answer = $stdin.gets.chomp
+
+    if %w[a A].include?(answer)
+      game_over('uncorrect')
+    elsif %w[b B].include?(answer)
+      game_over('uncorrect')
+    elsif %w[c C].include?(answer)
+      correct = true
+      puts 'Exactly, go to question 2'
+      question_2
+    elsif %w[d D].include?(answer)
+      game_over('uncorrect')
+    elsif answer == '0'
+      correct = true
+      next_question('question_1')
+    else
+      puts 'you entered the wrong syntax'
+    end
+  end
+end
+
+def question_2
+  puts %(Question2. What is the result of the expression "10/3" in ruby ​​language?
+\tA. 3
+\tB. 3.3333
+\tC. nil
+\tD. 1
+    )
+  correct = false
+  while true
+    print '>'
+    answer = $stdin.gets.chomp
+
+    if %w[a A].include?(answer)
+      correct = true
+      puts 'Exactly, go to question 2'
+      question_3
+    elsif %w[b B].include?(answer)
+      game_over('uncorrect')
+    elsif %w[c C].include?(answer)
+      game_over('uncorrect')
+    elsif %w[d D].include?(answer)
+      game_over('uncorrect')
+    elsif answer == '0'
+      correct = true
+      next_question('question_2')
+    else
+      puts 'you entered the wrong syntax'
+    end
+  end
+end
+
+def question_3
+  puts %(Questions 3. how many days in May?
+\tA. 30 days
+\tB. 28 days
+\tC. nothing
+\tD. 31 days
+    )
+  correct = false
+  while true
+    print '>'
+    answer = $stdin.gets.chomp
+
+    if %w[a A].include?(answer)
+      game_over('uncorrect')
+    elsif %w[b B].include?(answer)
+      game_over('uncorrect')
+    elsif %w[c C].include?(answer)
+      game_over('uncorrect')
+    elsif %w[d D].include?(answer)
+      correct = true
+      puts 'Exactly, go to question 4'
+      question_4
+    elsif answer == '0'
+      correct = true
+      next_question('question_3')
+    else
+      puts 'you entered the wrong syntax'
+    end
+  end
+end
+
+def question_4
+  puts %(Questions 4. How long will it take for every year to have 366 days in it?
+\tA. 1
+\tB. 9
+\tC. 4
+\tD. 100
+    )
+  correct = false
+  while true
+    print '>'
+    answer = $stdin.gets.chomp
+
+    if %w[a A].include?(answer)
+      game_over('uncorrect')
+    elsif %w[b B].include?(answer)
+      game_over('uncorrect')
+    elsif %w[c C].include?(answer)
+      correct = true
+      puts 'Exactly, go to question 5'
+      question_5
+    elsif %w[d D].include?(answer)
+      game_over('uncorrect')
+    elsif answer == '0'
+      correct = true
+      next_question('question_4')
+    else
+      puts 'you entered the wrong syntax'
+    end
+  end
+end
+
+def question_5
+  puts %( Questions 5. What animals can fly?
+
+\tA. Bird
+\tB. Crocodile
+\tC. Dog
+\tD. Chicken
+    )
+  correct = false
+  while true
+    print '>'
+    answer = $stdin.gets.chomp
+
+    if %w[a A].include?(answer)
+      correct = true
+      puts 'Excellent'
+      win
+    elsif %w[b B].include?(answer)
+      game_over('uncorrect')
+    elsif %w[c C].include?(answer)
+      game_over('uncorrect')
+    elsif %w[d D].include?(answer)
+      game_over('uncorrect')
+    elsif answer == '0'
+      correct = true
+      next_question('question_5')
+    else
+      puts 'you entered the wrong syntax'
+    end
+  end
+end
+
+def start
+  puts 'Welcome to the puzzle game'
+  puts 'you have 5 questions. to pass question type 0'
+  puts 'are you ready?(y/n)'
+
+  print '>'
+  choice = $stdin.gets.chomp
+
+  if choice == 'y'
+    question_1
+  else
+    game_over('See you again')
+  end
+end
+
+start

ex37.rb

+
+# Keyword	Description	Example
+# BEGIN	Run this block when the script starts.	BEGIN { puts "hi" }
+# END	Run this block when the script is done.	END { puts "hi" }
+# alias	Create another name for a function.	alias X Y
+# and	Logical and, but lower priority than &&.	puts "Hello" and "Goodbye"
+# begin	Start a block, usually for exceptions.	begin end
+# break	Break out of a loop right now.	while true; break; end
+# case	Case style conditional, like an if.	case X; when Y; else; end
+# class	Define a new class.	class X; end
+# def	Define a new function.	def X(); end
+# defined?	Is this class/function/etc. defined already?	defined? Class == "constant"
+# do	Create a block that maybe takes a parameter.	(0..5).each do |x| puts x end
+# else	Else conditional.	if X; else; end
+# elsif	Else if conditional	if X; elsif Y; else; end
+# end	Ends blocks, functions, classes, everything.	begin end # many others
+# ensure	Run this code whether an exception happens or not.	begin ensure end
+# for	For loop syntax. The .each syntax is preferred.	for X in Y; end
+# if	If conditional.	if X; end
+# in	In part of for-loops.	for X in Y; end
+# module	Define a new module.	module X; end
+# next	Skip to the next element of a .each iterator.	(0..5).each {|y| next }
+# not	Logical not. But use ! instead.	not true == false
+# or	Logical or.	puts "Hello" or "Goodbye"
+# redo	Rerun a code block exactly the same.	(0..5).each {|i| redo if i > 2}
+# rescue	Run this code if an exception happens.	begin rescue X; end
+# retry	In a rescue clause, says to try the block again.	(0..5).each {|i| retry if i > 2}
+# return	Returns a value from a function. Mostly optional.	return X
+# self	The current object, class, or module.	defined? self == "self"
+# super	The parent class of this class.	super
+# then	Can be used with if optionally.	if true then puts "hi" end
+# undef	Remove a function definition from a class.	undef X
+# unless	Inverse of if.	unless false then puts "not" end
+# until	Inverse of while, execute block as long as false.	until false; end
+# when	Part of case conditionals.	case X; when Y; else; end
+# while	While loop.	while true; end
+# yield	Pause and transfer control to the code block.	yield
+
+
+
+#           DATA TYPE
+
+# Type	Description	Example
+# true	True boolean value.	true or false == true
+# false	False boolean value.	false and true == false
+# nil	Represents "nothing" or "no value".	x = nil
+# strings	Stores textual information.	x = "hello"
+# numbers	Stores integers.	i = 100
+# floats	Stores decimals.	i = 10.389
+# arrays	Stores a list of things.	j = [1,2,3,4]
+# hashes	Stores a key=value mapping of things.	e = {'x' => 1, 'y' => 2}
+
+
+
+#       String Escape Sequences
+
+# Escape	Description
+# \\	Backslash
+# \'	Single-quote
+# \"	Double-quote
+# \a	Bell
+# \b	Backspace
+# \f	Formfeed
+# \n	Newline
+# \r	Carriage
+# \t	Tab
+# \v	Vertical tab
+
+
+
+#           Operators
+
+
+# Operator	Description	Example
+# +	Add	2 + 4 == 6
+# -	Subtract	2 - 4 == -2
+# *	Multiply	2 * 4 == 8
+# **	Power of	2 ** 4 == 16
+# /	Divide	2 / 4.0 == 0.5
+# %	Modulus	2 % 4 == 2
+# >	Greater than	4 > 4 == false
+# .	Dot access	"1".to_i == 1
+# ::	Colon access	Module::Class
+# []	List brackets	[1,2,3,4]
+# !	Not	!true == false
+# <	Less than	4 < 4 == false
+# >	Greater than	4 < 4 == false
+# >=	Greater than equal	4 >= 4 == true
+# <=	Less than equal	4 <= 4 == true
+# <=>	Comparison	4 <=> 4 == 0
+# ==	Equal	4 == 4 == true
+# ===	Equality	4 === 4 == true
+# !=	Not equal	4 != 4 == false
+# &&	Logical and (higher precedence)	true && false == false
+# ||	Logical or (higher precedence)	true || false == true
+# ..	Range inclusive	(0..3).to_a == [0, 1, 2, 3]
+# ...	Range non-inclusive	(0...3).to_a == [0, 1, 2]
+# @	Object scope	@var ; @@classvar
+# @@	Class scope	@var ; @@classvar
+# $	Global scope	$stdin

ex38.rb

+ten_things = "Apples Oranges Crows Telephone Light Sugar"
+
+puts "Wait there are not 10 things in that list. Let's fix that."
+
+#chuyen doi chuoi thanh arr ["Apples", "Oranges", "Crows", "Telephone", "Light", "Sugar"]
+stuff = ten_things.split(' ')
+
+
+more_stuff = ["Day", "Night", "Song", "Frisbee", "Corn", "Banana", "Girl", "Boy"]
+
+# using math to make sure there's 10 items
+
+while stuff.length != 10
+  next_one = more_stuff.pop
+  puts "Adding: #{next_one}"
+  stuff.push(next_one)
+  puts "There are #{stuff.length} items now."
+end
+
+puts "There we go: #{stuff}"
+
+puts "Let's do some things with stuff."
+
+puts stuff[1]
+puts stuff[-1] # whoa! fancy
+puts stuff.pop()
+puts stuff.join(' ')
+puts stuff[3...5].join("#")  

ex39.rb

+student = {
+    'Ha' => 'HA',
+    'Thanh' => 'TH',
+    'Trong' => 'TR',
+    'Hoa' => 'HO',
+    'Hao' => 'AO',
+    20 => 'ZO'
+}
+
+pro_language = {
+    'HA' => 'Ruby',
+    'TH' => 'Js',
+    'TR' => 'PHP',
+    'HO' => 'Python',
+    'AO' => 'Swift' 
+}
+
+
+
+puts pro_language[student['Ha']]
+
+student.each do |s, abb| 
+    puts "#{s} is a #{abb}"
+end
+
+
+student.each do |s, abb|
+    pl = pro_language[abb]
+    puts "#{s} is abbreviated #{abb} and has program language #{pl}"
+end
+
+
+def kiem_tra_ma_sv (list)
+    puts 'nhap ten sinh vien can xem'
+    student_name = $stdin.gets.chomp # tra ve kieu du lieu string
+    if !list[student_name]
+      puts "xin loi k co sinh vien nay"
+    else
+      puts "ma so sv la #{list[student_name]}"
+    end
+end
+
+kiem_tra_ma_sv(student)
\ No newline at end of file

ex4.rb

+cars = 100
+space_in_a_car = 4.0
+drivers = 30
+passengers = 90
+cars_not_driven = cars - drivers
+cars_driven = drivers
+carpool_capacity = cars_driven * space_in_a_car
+average_passengers_per_car = passengers / cars_driven
+
+
+puts "There are #{cars} cars available."
+puts "There are only #{drivers} drivers available."
+puts "There will be #{cars_not_driven} empty cars today."
+puts "We can transport #{carpool_capacity} people today."
+puts "We have #{passengers} to carpool today."
+puts "We need to put about #{average_passengers_per_car} in each car."
\ No newline at end of file

ex40.rb

+class Song
+
+  def initialize(lyrics)
+    @lyrics = lyrics
+  end
+
+  def sing_me_a_song()
+    @lyrics.each {|line| puts line }
+  end
+end
+
+happy_bday = Song.new(["Happy birthday to you",
+           "I don't want to get sued",
+           "So I'll stop right there"])
+
+bulls_on_parade = Song.new(["They rally around tha family",
+            "With pockets full of shells"])
+
+# print happy_bday.initialize       
+
+happy_bday.sing_me_a_song()
+
+bulls_on_parade.sing_me_a_song()
+
+class Name 
+
+  def initialize(name)
+    @name = name
+  end    
+
+  def call_the_name()
+    @name.each {|n| puts n}
+  end
+end
+
+
+student = Name.new(['ha', 'thanh', 'trong', 'hoa', 'hao'])
+student.call_the_name
+
+# class MyStuff
+
+#     def initialize()
+#         @tangerine = "And now a thousand years between"
+#     end
+
+#     attr_reader :tangerine
+
+#     def apple()
+#         puts "I AM CLASSY APPLES!"
+#     end
+
+# end
+
+# thing = MyStuff.new()
+# # MyStuff.apple
+# thing.apple
+# puts thing.tangerine
\ No newline at end of file

ex41.rb

+require 'open-uri'
+
+WORD_URL = "http://learncodethehardway.org/words.txt"
+WORDS = []
+
+PHRASES = {
+  "class ### < ###\nend" =>
+       "Make a class named ### that is-a ###.",
+  "class ###\n\tdef initialize(@@@)\n\tend\nend" =>
+       "class ### has-a initialize that takes @@@ parameters.",
+  "class ###\n\tdef ***(@@@)\n\tend\nend" =>
+       "class ### has-a function named *** that takes @@@ parameters.",
+  "*** = ###.new()" =>
+       "Set *** to an instance of class ###.",
+  "***.***(@@@)" =>
+       "From *** get the *** function, and call it with parameters @@@.",
+  "***.*** = '***'" =>
+       "From *** get the *** attribute and set it to '***'."
+}
+
+
+PHRASE_FIRST = ARGV[0] == "english"
+
+open(WORD_URL) {|f|
+  f.each_line {|word| WORDS.push(word.chomp)}
+}
+
+def craft_names(rand_words, snippet, pattern, caps=false)
+  names = snippet.scan(pattern).map do
+    word = rand_words.pop()
+    caps ? word.capitalize : word
+  end
+
+  return names * 2
+end
+
+def craft_params(rand_words, snippet, pattern)
+  names = (0...snippet.scan(pattern).length).map do
+    param_count = rand(3) + 1
+    params = (0...param_count).map {|x| rand_words.pop() }
+    params.join(', ')
+  end
+
+  return names * 2
+end
+
+def convert(snippet, phrase)
+  rand_words = WORDS.sort_by {rand}
+  class_names = craft_names(rand_words, snippet, /###/, caps=true)
+  other_names = craft_names(rand_words, snippet, /\*\*\*/)
+  param_names = craft_params(rand_words, snippet, /@@@/)
+
+  results = []
+
+  [snippet, phrase].each do |sentence|
+    # fake class names, also copies sentence
+    result = sentence.gsub(/###/) {|x| class_names.pop }
+
+    # fake other names
+    result.gsub!(/\*\*\*/) {|x| other_names.pop }
+
+    # fake parameter lists
+    result.gsub!(/@@@/) {|x| param_names.pop }
+
+    results.push(result)
+  end
+
+  return results
+end
+
+# keep going until they hit CTRL-D
+loop do
+  snippets = PHRASES.keys().sort_by {rand}
+
+  for snippet in snippets
+    phrase = PHRASES[snippet]
+    question, answer = convert(snippet, phrase)
+
+    if PHRASE_FIRST
+      question, answer = answer, question
+    end
+
+    print question, "\n\n> "
+
+    exit(0) unless $stdin.gets
+
+    puts "\nANSWER:  %s\n\n" % answer
+  end
+end
\ No newline at end of file

ex42.rb

+## Animal is-a object look at the extra credit
+class Animal
+end
+
+## Dog is-a Animal
+class Dog < Animal
+
+  def initialize(name)
+    ## Khoi tao name
+    @name = name
+  end
+
+  def call_name()
+    puts "Name of the dog: #{@name}"
+  end
+end
+
+## Cat is-a Animal
+class Cat < Animal
+
+  def initialize(name)
+    ## khoi tao name
+    @name = name
+  end
+end
+
+## ??
+class Person
+
+  def initialize(name)
+    ## ??
+    @name = name
+
+    ## Person has-a pet of some kind
+    @pet = nil
+  end
+
+  attr_accessor :pet
+end
+
+## Person has-a Employee #thua ke
+class Employee < Person
+
+  def initialize(name, salary)
+    ## ?? hmm what is this strange magic?
+    super(name)
+    ## ??
+    @salary = salary
+  end
+
+end
+
+## ??
+class Fish
+end
+
+## Fish has-a Salmon #thua ke 
+class Salmon < Fish
+end
+
+## Fish has-a Halibut #thua ke
+class Halibut < Fish
+end
+
+
+## rover is-a Dog
+rover = Dog.new("Rover")
+
+## satan is-a Cat
+satan = Cat.new("Satan")
+
+## mary is-a Person
+mary = Person.new("Mary")
+
+## mary has-a pet(satan)
+mary.pet = satan
+
+## frank is-a Person, has-a name and salary
+frank = Employee.new("Frank", 120000)
+
+## frank has-a pet(rover)
+frank.pet = rover
+
+## flipper is a Fish
+flipper = Fish.new()
+
+## Fish has-a Salmon, crouse is-a Salmon
+crouse = Salmon.new()
+
+## Fish has a Halibut, harru is-a Halibut 
+harry = Halibut.new()
+
+
+
+puts rover.call_name    
\ No newline at end of file

ex43.rb

+class Scene
+  def enter()
+    puts "This scene is not yet configured. Subclass it and implement enter()."
+    exit(1)
+  end
+end
+
+class Engine
+
+  def initialize(scene_map)
+    @scene_map = scene_map
+  end
+
+  def play()
+    current_scene = @scene_map.opening_scene()
+    last_scene = @scene_map.next_scene('finished')
+
+    while current_scene != last_scene
+      next_scene_name = current_scene.enter()
+      current_scene = @scene_map.next_scene(next_scene_name)
+    end
+
+    # be sure to print out the last scene
+    current_scene.enter()
+  end
+end
+
+class Death < Scene
+
+  @@quips = [
+    "You died.  You kinda suck at this.",
+     "Your mom would be proud...if she were smarter.",
+     "Such a luser.",
+     "I have a small puppy that's better at this."
+  ]
+
+  def enter()
+    puts @@quips[rand(0..(@@quips.length - 1))]
+    exit(1)
+  end
+end
+
+class CentralCorridor < Scene
+
+  def enter()
+    puts "The Gothons of Planet Percal #25 have invaded your ship and destroyed"
+    puts "your entire crew.  You are the last surviving member and your last"
+    puts "mission is to get the neutron destruct bomb from the Weapons Armory,"
+    puts "put it in the bridge, and blow the ship up after getting into an "
+    puts "escape pod."
+    puts "\n"
+    puts "You're running down the central corridor to the Weapons Armory when"
+    puts "a Gothon jumps out, red scaly skin, dark grimy teeth, and evil clown costume"
+    puts "flowing around his hate filled body.  He's blocking the door to the"
+    puts "Armory and about to pull a weapon to blast you."
+    print "> "
+
+    action = $stdin.gets.chomp
+
+    if action == "shoot!"
+      puts "Quick on the draw you yank out your blaster and fire it at the Gothon."
+      puts "His clown costume is flowing and moving around his body, which throws"
+      puts "off your aim.  Your laser hits his costume but misses him entirely.  This"
+      puts "completely ruins his brand new costume his mother bought him, which"
+      puts "makes him fly into an insane rage and blast you repeatedly in the face until"
+      puts "you are dead.  Then he eats you."
+      return 'death'
+
+    elsif action == "dodge!"
+      puts "Like a world class boxer you dodge, weave, slip and slide right"
+      puts "as the Gothon's blaster cranks a laser past your head."
+      puts "In the middle of your artful dodge your foot slips and you"
+      puts "bang your head on the metal wall and pass out."
+      puts "You wake up shortly after only to die as the Gothon stomps on"
+      puts "your head and eats you."
+      return 'death'
+
+    elsif action == "tell a joke"
+      puts "Lucky for you they made you learn Gothon insults in the academy."
+      puts "You tell the one Gothon joke you know:"
+      puts "Lbhe zbgure vf fb sng, jura fur fvgf nebhaq gur ubhfr, fur fvgf nebhaq gur ubhfr."
+      puts "The Gothon stops, tries not to laugh, then busts out laughing and can't move."
+      puts "While he's laughing you run up and shoot him square in the head"
+      puts "putting him down, then jump through the Weapon Armory door."
+      return 'laser_weapon_armory'
+
+    else
+      puts "DOES NOT COMPUTE!"
+      return 'central_corridor'
+    end
+  end
+end
+
+class LaserWeaponArmory < Scene
+
+  def enter()
+    puts "You do a dive roll into the Weapon Armory, crouch and scan the room"
+    puts "for more Gothons that might be hiding.  It's dead quiet, too quiet."
+    puts "You stand up and run to the far side of the room and find the"
+    puts "neutron bomb in its container.  There's a keypad lock on the box"
+    puts "and you need the code to get the bomb out.  If you get the code"
+    puts "wrong 10 times then the lock closes forever and you can't"
+    puts "get the bomb.  The code is 3 digits."
+    code = "#{rand(1..9)}#{rand(1..9)}#{rand(1..9)}"
+    print "[keypad]> "
+    guess = $stdin.gets.chomp
+    guesses = 0
+
+    while guess != code && guesses < 10
+      puts "BZZZZEDDD!"
+      guesses += 1
+      print "[keypad]> "
+      guess = $stdin.gets.chomp
+    end
+
+    if guess == code
+        puts "The container clicks open and the seal breaks, letting gas out."
+        puts "You grab the neutron bomb and run as fast as you can to the"
+        puts "bridge where you must place it in the right spot."
+        return 'the_bridge'
+    else
+        puts "The lock buzzes one last time and then you hear a sickening"
+        puts "melting sound as the mechanism is fused together."
+        puts "You decide to sit there, and finally the Gothons blow up the"
+        puts "ship from their ship and you die."
+        return 'death'
+    end
+  end
+end
+
+
+class TheBridge < Scene
+
+  def enter()
+    puts "You burst onto the Bridge with the netron destruct bomb"
+    puts "under your arm and surprise 5 Gothons who are trying to"
+    puts "take control of the ship.  Each of them has an even uglier"
+    puts "clown costume than the last.  They haven't pulled their"
+    puts "weapons out yet, as they see the active bomb under your"
+    puts "arm and don't want to set it off."
+    print "> "
+
+    action = $stdin.gets.chomp
+
+    if action == "throw the bomb"
+      puts "In a panic you throw the bomb at the group of Gothons"
+      puts "and make a leap for the door.  Right as you drop it a"
+      puts "Gothon shoots you right in the back killing you."
+      puts "As you die you see another Gothon frantically try to disarm"
+      puts "the bomb. You die knowing they will probably blow up when"
+      puts "it goes off."
+      return 'death'
+
+    elsif action == "slowly place the bomb"
+      puts "You point your blaster at the bomb under your arm"
+      puts "and the Gothons put their hands up and start to sweat."
+      puts "You inch backward to the door, open it, and then carefully"
+      puts "place the bomb on the floor, pointing your blaster at it."
+      puts "You then jump back through the door, punch the close button"
+      puts "and blast the lock so the Gothons can't get out."
+      puts "Now that the bomb is placed you run to the escape pod to"
+      puts "get off this tin can."
+      return 'escape_pod'
+    else
+      puts "DOES NOT COMPUTE!"
+      return "the_bridge"
+    end
+  end
+end
+
+
+class EscapePod < Scene
+
+  def enter()
+    puts "You rush through the ship desperately trying to make it to"
+    puts "the escape pod before the whole ship explodes.  It seems like"
+    puts "hardly any Gothons are on the ship, so your run is clear of"
+    puts "interference.  You get to the chamber with the escape pods, and"
+    puts "now need to pick one to take.  Some of them could be damaged"
+    puts "but you don't have time to look.  There's 5 pods, which one"
+    puts "do you take?"
+
+    good_pod = rand(1..5)
+    print "[pod #]> "
+    guess = $stdin.gets.chomp.to_i
+
+    if guess != good_pod
+      puts "You jump into pod %s and hit the eject button." % guess
+      puts "The pod escapes out into the void of space, then"
+      puts "implodes as the hull ruptures, crushing your body"
+      puts "into jam jelly."
+      return 'death'
+    else
+      puts "You jump into pod %s and hit the eject button." % guess
+      puts "The pod easily slides out into space heading to"
+      puts "the planet below.  As it flies to the planet, you look"
+      puts "back and see your ship implode then explode like a"
+      puts "bright star, taking out the Gothon ship at the same"
+      puts "time.  You won!"
+
+
+      return 'finished'
+    end
+  end
+end
+
+class Finished < Scene
+  def enter()
+    puts "You won! Good job."
+  end
+end
+
+class Map
+  @@scenes = {
+    'central_corridor' => CentralCorridor.new(),
+    'laser_weapon_armory' => LaserWeaponArmory.new(),
+    'the_bridge' => TheBridge.new(),
+    'escape_pod' => EscapePod.new(),
+    'death' => Death.new(),
+    'finished' => Finished.new(),
+  }
+
+
+  def initialize(start_scene)
+    @start_scene = start_scene
+  end
+
+
+  def next_scene(scene_name)
+    val = @@scenes[scene_name]
+    return val
+  end
+
+  def opening_scene()
+    return next_scene(@start_scene)
+  end
+end
+
+a_map = Map.new('central_corridor')
+a_game = Engine.new(a_map)
+a_game.play()
\ No newline at end of file

ex44.rb

+class Parent
+
+  def initialize(stuff)
+        @stuff = stuff
+    end 
+  def override()
+    puts "PARENT override()"
+  end
+
+  def implicit()
+    puts "PARENT implicit()"
+  end
+
+  def altered()
+    puts "PARENT altered()"
+  end
+end
+
+class Child < Parent
+
+
+  def initialize(stuff)
+        @stuff = stuff
+        super()
+    end
+  def override()
+    puts "CHILD override()"
+  end
+
+  def altered()
+    puts "CHILD, BEFORE PARENT altered()"
+    super()
+    puts "CHILD, AFTER PARENT altered()"
+  end
+  
+end
+
+
+
+dad = Parent.new('hello')
+son = Child.new()
+
+
+
+
+
+
+# dad.implicit()
+# son.implicit()
+
+# dad.override()
+# son.override()
+
+# dad.altered()
+# son.altered()
\ No newline at end of file

ex5.rb

+my_name = 'Zed A. Shaw'
+my_age = 35 # not a lie in 2009
+my_height = 74 # inches
+my_weight = 180 # lbs
+my_eyes = 'Blue'
+my_teeth = 'White'
+my_hair = 'Brown'
+
+puts "Let's talk about #{my_name}."
+puts "He's #{my_height} inches tall."
+puts "He's #{my_weight} pounds heavy."
+puts "Actually that's not too heavy."
+puts "He's got #{my_eyes} eyes and #{my_hair} hair."
+puts "His teeth are usually #{my_teeth} depending on the coffee."
+
+# this line is tricky, try to get it exactly right
+puts "If I add #{my_age}, #{my_height}, and #{my_weight} I get #{my_age + my_height + my_weight}."
\ No newline at end of file

ex6.rb

+types_of_people = 10
+x = "There are #{types_of_people} types of people."
+binary = "binary"
+do_not = "don't"
+y = "Those who know #{binary} and those who #{do_not}."
+
+puts x
+puts y
+
+puts "I said: #{x}."
+puts "I also said: '#{y}'."
+
+hilarious = false
+joke_evaluation = "Isn't that joke so funny?! #{hilarious}"
+
+puts joke_evaluation
+
+w = "This is the left side of..."
+e = "a string with a right side."
+
+puts w + e

ex7.rb

+puts "Mary had a little lamb."
+puts "Its fleece was white as #{'snow'}."
+puts "And everywhere that Mary went."
+puts "." * 10  # what'd that do?
+
+end1 = "C"
+end2 = "h"
+end3 = "e"
+end4 = "e"
+end5 = "s"
+end6 = "e"
+end7 = "B"
+end8 = "u"
+end9 = "r"
+end10 = "g"
+end11 = "e"
+end12 = "r"
+
+# watch that print vs. puts on this line what's it do?
+print end1 + end2 + end3 + end4 + end5 + end6
+puts end7 + end8 + end9 + end10 + end11 + end12
\ No newline at end of file

ex8.rb

+formatter = "%{first} %{second} %{third} %{fourth}"
+
+puts formatter % {first: 1, second: 2, third: 3, fourth: 4}
+puts formatter % {first: "one", second: "two", third: "three", fourth: "four"}
+puts formatter % {first: true, second: false, third: true, fourth: false}
+puts formatter % {first: formatter, second: formatter, third: formatter, fourth: formatter}
+
+puts formatter % {
+  first: "I had this thing.",
+  second: "That you could type up right.",
+  third: "But it didn't sing.",
+  fourth: "So I said goodnight."
+}
\ No newline at end of file

ex9.rb

+# Here's some new strange stuff, remember type it exactly.
+
+days = "Mon Tue Wed Thu Fri Sat Sun"
+months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"
+
+puts "Here are the days: #{days}"
+puts "Here are the months: #{months}"
+
+puts %q{
+There's something going on here.
+With this weird quote
+We'll be able to type as much as we like.
+Even 4 lines if we want, or 5, or 6.
+}
\ No newline at end of file

ruby-training @ af69e4e6

+Subproject commit af69e4e6b7e55bdfc85555c131cab828bf7775b9