Added ask.rb and old_roman_numeral.rb

ch09-writing-your-own-methods/ask.rb

@@ -1,3 +1,34 @@
 def ask question
-  # your code here
-end
+  while true
+    puts question
+    input = gets.chomp.downcase
+    if input == 'yes'
+      return true
+    elsif input == 'no'
+      return false
+    else
+      puts "please answer yes or no"
+    end
+  end
+end
+
+puts "Hello and thank you for participating"
+puts
+
+ask "Do you like tacos?"
+ask "Do you like burritos?"
+wets_bed = ask "Do you wet the bed"
+ask "Do you like chimichangas?"
+ask "Do you like sopapillas?"
+puts "just a couple more..."
+ask "Do you like horchata?"
+ask "Do you like flautas?"
+
+puts
+puts "Debriefing:"
+puts "Thank you for participating"
+puts
+puts
+puts
+
+puts wets_bed

ch09-writing-your-own-methods/old_school_roman_numerals.rb

@@ -1,3 +1,14 @@
 def old_roman_numeral num
-  # your code here
-end
+  roman = ''
+
+roman = roman + 'M' * (num / 1000)
+  roman = roman + 'D' * (num % 1000 / 500)
+  roman = roman + 'C' * (num % 500 / 100)
+  roman = roman + 'L' * (num % 100 / 50)
+  roman = roman + 'X' * (num % 50 / 10)
+  roman = roman + 'V' * (num % 10 / 5)
+  roman = roman + 'I' * (num % 5 / 1)
+  roman
+end
+
+# puts(old_roman_numeral(1999))

ch09-writing-your-own-methods/roman_numerals.rb

@@ -1,3 +1,35 @@
 def roman_numeral num
-  # your code here
-end
+  raise 'Must use positive integer' if num <= 0
+
+  digit_vals = [['I', 5, 1],
+                ['V', 10, 5],
+                ['X', 50, 10],
+                ['L', 100, 50],
+                ['C', 500, 100],
+                ['D', 1000, 500],
+                ['M', nil, 1000]]
+
+  roman = ''
+  remaining = nil
+
+  # Build string "roman" in reverse.
+  build_rev = proc do |l,m,n|
+    num_l = m ? (num % m / n) : (num / n)
+    full  = m && (num_l == (m/n - 1))
+
+  if full && (num_l>1 || remaining)
+    # must carry
+    remaining ||= l # carry l if not already carrying
+  else
+    if remaining
+      roman << l + remaining
+      remaining = nil end
+      roman << l * num_l
+    end
+  end
+  digit_vals.each {|l,m,n| build_rev[l,m,n]}
+
+  roman.reverse
+end
+
+# puts(old_roman_numeral(1999))

ch10-nothing-new/dictionary_sort.rb

@@ -1,3 +1,56 @@
-def dictionary_sort arr
-  # your code here
-end
+
+=begin
+def sort some_array
+  recursive_sort some_array, []
+end
+
+
+def recursive_sort unsorted_array, sorted_array
+  sorted_array = unsorted_array.sort { |x, y| x <=> y }
+end
+
+puts sort ["meems", "meems", "freems", "frrops", "zeeps", "haha"]
+=end
+
+
+
+
+# The well-known quicksort algorithm.
+=begin
+def sort arr
+  return arr if arr.length <= 1
+
+  if arr.pop.capitalize != arr.pop
+    middle = arr.pop
+    less = arr.select{|x| x < middle}
+    more = arr.select{|x| x >= middle}
+
+  elsif arr.pop.capitalize == arr.pop
+    middle = arr.pop
+    less = arr.select{|x| x < middle}
+    more = arr.select{|x| x >= middle}
+
+  end
+sort(less) + [middle] + sort(more)
+end
+p(sort(['blablabla', 'car', 'Alpha', 'zebra']))
+=end
+
+def super_sort unsorted_array
+  capitalized = unsorted_array.select {|x| x.capitalize == x}
+  uncapitalized = unsorted_array.select {|x| x.capitalize != x}
+  capitalized.sort! {|x, y| x <=> y }
+  uncapitalized.sort! {|x, y| x <=> y }
+  puts capitalized
+  puts
+  puts
+  puts uncapitalized
+=begin
+      if x == x.capitalize
+      capitals << x
+      puts capitals
+=end
+
+end
+
+super_sort ["baaa", "Baa", 'car', 'Car']

ch10-nothing-new/english_number.rb

@@ -1,3 +1,130 @@
 def english_number number
-  # your code here
+  if number < 0 # No negative numbers.
+    return 'Please enter a number that isn\'t negative.'
+  end
+  if number == 0
+    return 'zero'
+  end
+
+  # No more special cases! No more returns!
+
+  num_string = '' # This is the string we will return.
+
+  ones_place = ['one', 'two', 'three',
+                'four', 'five', 'six',
+                'seven', 'eight', 'nine']
+
+  tens_place = ['ten', 'twenty', 'thirty',
+                'forty', 'fifty', 'sixty',
+                'seventy', 'eighty', 'ninety']
+
+
+  teenagers = ['eleven', 'twelve', 'thirteen',
+               'fourteen', 'fifteen', 'sixteen',
+               'seventeen', 'eighteen', 'nineteen']
+
+  zillions = [['hundred', 2],
+              ['thousand', 3],
+              ['million', 6],
+              ['billion', 9],
+              ['trillion', 12],
+              ['quadrillion', 15],
+              ['quintillion', 18],
+              ['sextillion', 21],
+              ['septillion', 24],
+              ['octillion', 27],
+              ['nonillion', 30],
+              ['decillion', 33],
+              ['undecillion', 36],
+              ['duodecillion', 39],
+              ['tredecillion', 42],
+              ['quattuordecillion', 45],
+              ['quindecillion', 48],
+              ['sexdecillion', 51],
+              ['septendecillion', 54],
+              ['octodecillion', 57],
+              ['novemdecillion', 60],
+              ['vigintillion', 63],
+              ['googol', 100]]
+
+  # "left" is how much of the number
+  # we still have left to write out.
+  # "write" is the part we are
+  # writing out right now.
+  # write and left...get it? :)
+  left = number
+
+  while zillions.length > 0
+    zil_pair = zillions.pop
+    zil_name = zil_pair[0]
+    zil_base = 10 ** zil_pair[1]
+    write = left/zil_base # How many zillions left?
+    left = left - write*zil_base # Subtract off those zillions.
+
+    if write > 0
+      # Now here's the recursion:
+      prefix = english_number write
+      num_string = num_string + prefix + ' ' + zil_name
+
+      if left > 0
+        # So we don't write 'two billionfifty-one'...
+        num_string = num_string + ' '
+      end
+    end
+  end
+
+  write = left/10 # How many tens left?
+  left = left - write*10 # Subtract off those tens.
+
+  if write > 0
+    if ((write == 1) and (left > 0))
+      # Since we can't write "tenty-two" instead of
+      # "twelve", we have to make a special exception
+      # for these.
+      num_string = num_string + teenagers[left-1]
+      # The "-1" is because teenagers[3] is
+      # 'fourteen', not 'thirteen'.
+
+      # Since we took care of the digit in the
+      # ones place already, we have nothing left to write.
+      left = 0
+    else
+      num_string = num_string + tens_place[write-1]
+      # The "-1" is because tens_place[3] is
+      # 'forty', not 'thirty'.
+    end
+
+    if left > 0
+      # So we don't write 'sixtyfour'...
+      num_string = num_string + '-'
+    end
+  end
+
+  write = left # How many ones left to write out?
+  left = 0 # Subtract off those ones.
+
+  if write > 0
+    num_string = num_string + ones_place[write-1]
+    # The "-1" is because ones_place[3] is
+    # 'four', not 'three'.
+  end
+
+  # Now we just return "num_string"...
+  num_string
 end
+
+# puts english_number( 0)
+# puts english_number( 9)
+# puts english_number( 10)
+# puts english_number( 11)
+# puts english_number( 17)
+# puts english_number( 32)
+# puts english_number( 88)
+# puts english_number( 99)
+# puts english_number(100)
+# puts english_number(101)
+# puts english_number(234)
+# puts english_number(3211)
+# puts english_number(999999)
+# puts english_number(1000000000000)
+# puts english_number(109238745102938560129834709285360238475982374561034)

ch10-nothing-new/ninety_nine_bottles_of_beer.rb

@@ -1 +1,15 @@
-# your code here
+require_relative 'english_number'
+
+@number = 100
+
+while @number > 0
+  if @number > 1
+    puts ((english_number @number) + ' bottles of beer on the wall, ' +
+    (english_number @number) + ' Bottles of beer!')
+    puts ('Take one off the wall and pass it around or smth, ' +
+    (english_number (@number - 1)) + ' Bottles of beer on the wall!')
+  elsif @number == 1
+    puts "One bottle of beer on the wall."
+  end
+  @number = @number - 1
+end

ch10-nothing-new/shuffle.rb

@@ -1,3 +1,16 @@
 def shuffle arr
-  # your code here
-end
+  random = Random.new.rand(1..3)
+  operand = arr.pop
+  c = 100
+  while c > 0
+    if random > 2
+      operand.prepend arr
+    else
+      operand << arr
+    end
+    c = c - 1
+  end
+  return arr
+end
+
+shuffle(['hi', 'bye', 'yes', 'no'])

ch10-nothing-new/test.rb

@@ -0,0 +1,7 @@
+arr = ['Cayman']
+
+if arr.pop.capitalize == arr.pop
+  puts "It's capitalized"
+else
+  puts "it isn't"
+end

ch11-reading-and-writing/safer_picture_downloading.rb

@@ -1 +1,29 @@
-# your code here
+Dir.chdir '/users/michaelcalvey/Desktop/Music/'
+
+pic_names = Dir['F:/**/*.jpg']
+puts "What would you like to call this batch?"
+
+batch_name = gets.chomp
+
+puts
+print "Downloading #{pic_names.length} files:  "
+
+pic_number = 1
+
+pic_names.each do |name|
+  print '.'
+
+  if File.exists?("#{batch_name}#{pic_number}.jpg") == true
+    puts "File already exists, skipping..."
+    exit
+  else
+    new_name = if pic_number < 10
+      "#{batch_name}#{pic_number}.jpg"
+    else
+      "#{batch_name}#{pic_number}.jpg"
+    end
+  end
+  File.rename name, new_name
+  pic_number = pic_number + 1
+end
+puts