Exercise

.vscode/launch.json

+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "ruby-debug",
+            "request": "launch",
+            "name": "Launch File",
+            "program": "${workspaceFolder}/${command:AskForProgramName}",
+            "programArgs": [],
+            "useBundler": false
+        }
+    ]
+}
\ No newline at end of file

branch_funtion.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
+  
+  gold_room()
\ No newline at end of file

exercise_f22.rb

+=begin #Exercise 24: More Practice
+puts "let's pratice everything."
+puts 'You \'d need to know \'bout escapes with \\ that do \n newlines and \t tabs. '
+
+poem = <<MP
+\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.
+MP
+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."
+
+puts "We can also do that this way:"
+puts "We'd have %s beans, %d jars, and %d crates." % secret_formula(start_point)
+=end
+
+#Exercise 25: Even More Practice
+=begin 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
+=end
+#Exercise 29: What If
+people = 20
+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

exercise_f30.rb

+#Exercise 30: Else and If
+=begin 
+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
+=end
+#Exercise 31: Making Decisions
+=begin puts "You enter a dark room with two doors.  Do you go through door #1 or door #2?"
+print "> "
+door = $stdin.gets.chomp
+
+if door == "1"
+    puts "There's a giant bear here eating a cheese cake.  What do you do?"
+    puts "1. Take the cake."
+    puts "2. Scream at the bear."
+    print "> "
+    bear = $stdin.gets.chomp
+    if bear == "1"
+        puts "The bear eats your face off.  Good job!"
+    elsif bear == "2"
+        puts "The bear eats your legs off.  Good job!"
+    else
+        puts "Well, doing %s is probably better.  Bear runs away." % bear
+    end
+
+elsif door == "2"
+    puts "You stare into the endless abyss at Cthulhu's retina."
+    puts "1. Blueberries."
+    puts "2. Yellow jacket clothespins."
+    puts "3. Understanding revolvers yelling melodies."
+    print "> "
+    insanity = $stdin.gets.chomp
+
+
+    if insanity == "1" || insanity == "2"
+        puts "Your body survives powered by a mind of jello.  Good job!"
+    else
+        puts "The insanity rots your eyes into a pool of muck.  Good job!"
+    end
+
+else
+    puts "You stumble around and fall on a knife and die.  Good job!"
+end
+
+=end
+#Exercise 32: Loops and Arrays
+=begin the_count = [1, 2, 3, 4, 5, 6 ]
+fruits = ['apples', 'oranges', 'pears', 'apricots']
+change = [1, 'pennies', 2, 'dimes', 3, 'quarters']
+#loop for
+for number in the_count
+    puts "This is count #{number}"
+end
+#each
+fruits.each do |fruit|
+    puts "A fruit of type: #{fruit}"
+end
+#change
+change.each {|i| puts "I got #{i}" }
+#build list
+elements = [7, 8]
+the_count.each do|i|
+    puts "Adding #{i} to the list." 
+    elements.push(i)
+end
+
+elements.each {|i| puts "Element was: #{i}" } 
+=end
+#Exercise 33: While Loops
+=begin
+   numbers = []
+    def numbers_list(i,x):
+        i = 0
+        while i < x:
+            print "At the top of i is %d" % i
+            numbers.append(i)
+            i += 1
+            print "Numbers now: ", numbers
+            print "At the bottom of i is %d" % i
+        return numbers
+
+    numbers_list(6,1)
+    print "the numbers: "
+
+    for num in numbers:
+        print num
+number_list(2,7)
+=end
+
+#Exercise 34: Accessing Elements of Arrays
+
+animals = ['bear' , 'ruby', 'peacock' , 'kangaroo' , 'whale' , 'platypus' ]
+choice = 0;
+while choice < 7
+    puts %Q{
+        --------------------------------------
+        \t\tMenu
+        Choose your choice
+        1.bear
+        2.ruby
+        3.peacock
+        4.kangaroo
+        5.whale
+        6.platypus"
+        7.exit
+        --------------------------------------
+        }
+    choice = $stdin.gets.to_i
+    if(choice == 1)
+        puts "The first (1st) animal is at 0 and is a bear.\nThe animal at 0 is the 1st animal and is a bear."
+    elsif(choice == 2)
+        puts "The first (2st) animal is at 1 and is a ruby.\nThe animal at 1 is the 2st animal and is a ruby."
+    elsif(choice == 3)
+        puts "The first (3st) animal is at 2 and is a peacock.\nThe animal at 2 is the 3st animal and is a peacock."
+    elsif(choice == 4)
+        puts "The first (4st) animal is at 3 and is a kangaroo.\nThe animal at 3 is the 4st animal and is a kangaroo."
+    elsif(choice == 5)
+        puts "The first (5st) animal is at 4 and is a whale.\nThe animal at 4 is the 5st animal and is a whale."
+    elsif(choice == 6)
+        puts "The first (6st) animal is at 5 and is a platypus.\nThe animal at 5 is the 6st animal and is a platypus."
+    elsif(choice == 7)
+        puts "Hope you will comeback soon"
+    else
+        puts "Please choose 1-->7"
+    end 
+end
+

first.rb

+=begin  
+#Exercise 4: Variables and Names
+cars = 100
+space_in_a_car = 4.0
+drivers =30
+passengers =90
+car_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 #{car_not_driven} empty cars today."
+puts "We can transport #{carpool_capacity} peolple today."
+puts "We have #{passengers} to carpool today."
+puts "We need to put about #{average_passengers_per_car} in each car"
+#Exercise 5: More Variables and Printing
+name = 'Zed A. Shaw'
+age = 35 # not a lie in 2009
+
+height = 74  # inches
+height_cm = height * 2.54
+weight = 180  # lbs
+weight_kg = weight / 2.2046
+
+eyes = 'Blue'
+teeth = 'White'
+hair = 'Brown'
+
+puts "Let's talk about #{name}."
+puts "He's #{height_cm} centimets tall."
+puts "He's #{weight_kg} kilograms heavy."
+puts "Actually that's not too heavy."
+puts "He's got #{eyes} eyes and #{hair} hair."
+puts "His teeth are usually #{teeth} depending on the coffee."
+
+# this line is tricky, try to get it exactly right
+puts "If I add #{age}, #{height_cm}, and #{weight_kg} I get #{age + height_cm + weight_kg}"
+
+
+#Exercise 6: Strings and Text
+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
+
+
+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"
+
+print end1 + end2 + end3 + end4 + end5 + end6 
+puts end7 + end8 + end9 + end10 + end11 + end12
+
+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.
+    }
+
+print "How old are you? "
+age = gets.chomp
+print "Where are u from? "
+country = gets.chomp
+puts "So, you're #{age} old, live #{country}"
+
+print "Give me a number: "
+number = gets.chomp.to_f
+bigger = number * 10
+puts "A bigger number is #{bigger}"
+
+print "GIve me another number: "
+another = gets.chomp
+number = another.to_i
+smaller = number / 10
+puts "A small number is #{smaller}."
+
+
+#Exercise 13: Parameters, Unpacking, Variables
+first, second, third = ARGV
+puts "Your first variable is: #{first}"
+puts "Your second variable is: #{second}"
+puts "Your third variable is: #{third}"
+
+user_name = ARGV.first
+prompt = '> '
+
+puts "Hi #{user_name}."
+puts "I'd like to ask you a few questions."
+puts "Do u like me #{user_name}? ", prompt
+likes = $stdin.gets.chomp
+
+puts "Where u live #{user_name}? ", prompt
+lives = $stdin.gets.chomp
+
+puts "What kind of computer do you have? ", prompt
+computer = $stdin.gets.chomp
+puts %Q{
+Alright, so you said #{likes} about liking me.
+You live in #{lives}.  Not sure where that is.
+And you have a #{computer} computer.  Nice.
+}
+
+
+filename = ARGV.first
+txt = open(filename)
+
+puts " Here's ur file #{filename}: "
+print txt.read
+print "Type the filename again: "
+file_again = $stdin.gets.chomp
+
+txt_again = open(file_again)
+
+print txt_again.read
+
+
+filename = ARGV.first
+
+puts "We're going to erase #{filename}"
+puts "If u dun want that, hit CTRL-C. "
+puts "If u do want that, hit RETURN."
+
+$stdin.gets
+
+puts "opening the file..."
+target = open(filename, 'w')
+
+puts "Truncating the file. "
+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 = $stdin.gets.chomp
+
+puts "I'm going to write these to the file."
+
+target.write(line1)
+target.write("\n")
+target.write(line2)
+target.write("\n")
+target.write(line3)
+target.write("\n")
+
+puts "And finally, we close it."
+target.close
+=end
+=begin 
+from_file, to_file = ARGV
+
+puts "Copying from #{from_file} to #{to_file}"
+in_file = open(from_file)
+indata = in_file.read
+puts "The input file is #{indata.length} bytes long"
+
+puts "Does the output file exist? #{File.exist?(to_file)}"
+puts "Ready, hit RETURN to continue, CTRL-C to abort."
+$stdin.gets
+
+out_file =open(to_file,'w')
+out_file.write(indata)
+
+puts "Alright, all done."
+out_file.close
+in_file.close
+=end
+
+# this one is like your scripts with ARGV
+=begin 
+  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)
+
+Exercise 21: Functions Can Return Something
+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?"
+=end