initial pull

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

@@ -1,3 +1,13 @@
 def ask question
-  # your code here
-end
+  while true
+    puts question
+    reply = gets.chomp.downcase
+      if reply == 'yes'
+        return true
+      elsif reply == 'no'
+        return false
+      else
+      puts 'Please answer "yes" or "no".'
+  end
+end
+end

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

@@ -1,3 +1,13 @@
 def old_roman_numeral num
-  # your code here
-end
+
+oldrom = ""
+
+oldrom = oldrom + 'M' * (num / 1000)
+oldrom = oldrom + 'D' * (num % 1000 / 500)
+oldrom = oldrom + 'C' * (num % 500 / 100)
+oldrom = oldrom + 'L' * (num % 100 / 50)
+oldrom = oldrom +'X' * (num % 50 / 10)
+oldrom = oldrom + 'V' * (num % 10 / 5)
+oldrom = oldrom + 'I' * (num % 5 / 1)
+oldrom
+end

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

@@ -1,3 +1,42 @@
 def roman_numeral num
-  # your code here
-end
+  #changes only to 4 and 9 in each tier
+
+  newrom = ""
+
+  thou = (num /1000)
+  hund = (num %1000 / 100)
+  ten = (num % 100 /10)
+  one = (num % 10)
+
+  newrom = 'M' * thou
+
+  if hund == 9
+    newrom = newrom + 'CM'
+  elsif hund == 4
+    newrom = newrom + 'CD'
+  else
+  newrom = newrom + 'D' * (num % 1000 / 500)
+  newrom = newrom + 'C' * (num % 500/ 100)
+  end
+
+  if ten == 9
+    newrom = newrom + 'XC'
+  elsif ten == 4
+    newrom = newrom + 'XL'
+  else
+    newrom = newrom + 'L' * (num % 100 / 50)
+    newrom = newrom + 'X' * (num % 50 / 10)
+  end
+
+  if one == 9
+    newrom = newrom + 'IX'
+  elsif one == 4
+    newrom = newrom + 'IV'
+  else
+    newrom = newrom + 'V' * (num % 10 / 5)
+    newrom = newrom + 'I' * (num % 5 / 1)
+  end
+  newrom
+end
+
+puts roman_numeral 1992

ch10-nothing-new/dictionary_sort.rb

@@ -1,3 +1,11 @@
 def dictionary_sort arr
-  # your code here
-end
+  return arr if arr.length <=1
+
+  middle = arr.pop
+  less = arr.select{|x| x.downcase < middle.downcase}
+  more = arr.select{|x| x.downcase >= middle.downcase}
+
+  dictionary_sort(less) + [middle] + dictionary_sort(more)
+end
+
+puts dictionary_sort ['The', 'quick', 'brown', 'fox', 'jumps', 'over', 'the', 'lazy', 'dog']

ch10-nothing-new/english_number.rb

@@ -1,3 +1,87 @@
 def english_number number
-  # your code here
+  if number < 0
+    return 'Please enter a number that isn\'t negative.'
+  end
+  if number == 0
+    return 'zero'
+  end
+
+  num_string = ''
+
+  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 = number
+
+  while zillions.length > 0
+    zil_pair = zillions.pop
+    zil_name = zil_pair[0]
+    zil_base = 10  ** zil_pair[1]
+    write = left/zil_base
+    left = left - write*zil_base
+
+    if write > 0
+      prefix = english_number write
+      num_string = num_string + prefix + ' ' + zil_name
+
+      if left > 0
+        num_string = num_string + ' '
+      end
+    end
+  end
+
+  write = left/10
+  left = left - write*10
+
+  if write > 0
+    if ((write == 1) and (left > 0))
+    num_string = num_string + teenagers[left-1]
+    left = 0
+  else
+    num_string = num_string + tens_place[write-1]
+  end
+
+  if left > 0
+    num_string = num_string + '-'
+  end
 end
+
+write = left
+left = 0
+
+if write > 0
+  num_string = num_string + ones_place[write-1]
+end
+
+num_string
+end
+
+puts english_number 25
+puts english_number 0
+puts english_number 1000000000
+puts english_number 55986745241657

ch10-nothing-new/ninety_nine_bottles_of_beer.rb

@@ -1 +1,96 @@
-# your code here
+def english_number number
+  if number < 0
+    return 'Please enter a number that isn\'t negative.'
+  end
+  if number == 0
+    return 'zero'
+  end
+
+  num_string = ''
+
+  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 = number
+
+  while zillions.length > 0
+    zil_pair = zillions.pop
+    zil_name = zil_pair[0]
+    zil_base = 10  ** zil_pair[1]
+    write = left/zil_base
+    left = left - write*zil_base
+
+    if write > 0
+      prefix = english_number write
+      num_string = num_string + prefix + ' ' + zil_name
+
+      if left > 0
+        num_string = num_string + ' '
+      end
+    end
+  end
+
+  write = left/10
+  left = left - write*10
+
+  if write > 0
+    if ((write == 1) and (left > 0))
+    num_string = num_string + teenagers[left-1]
+    left = 0
+  else
+    num_string = num_string + tens_place[write-1]
+  end
+
+  if left > 0
+    num_string = num_string + '-'
+  end
+end
+
+write = left
+left = 0
+
+if write > 0
+  num_string = num_string + ones_place[write-1]
+end
+
+num_string
+end
+
+num_at_start = 10
+num_now = num_at_start
+while num_now > 2
+  puts english_number(num_now).capitalize + ' bottles of beer on the wall, ' + english_number(num_now) + ' bottles of beer!'
+  num_now = num_now - 1
+  puts 'Take one down, pass it around, ' +
+  english_number(num_now) + ' bottles of beer on the wall!'
+end
+
+puts "Two bottles of beer on the wall, two bottles of beer!"
+puts "Take one down, pass it around, one bottle of beer on the wall!"
+puts "One bottle of beer on the wall, one bottle of beer!"
+puts "Take one down, pass it around, no more bottles of beer on the wall!"

ch10-nothing-new/shuffle.rb

@@ -1,3 +1,25 @@
 def shuffle arr
-  # your code here
-end
+  shuf = []
+  while arr.length > 0
+    rand_index = rand (arr.length)
+
+    curr_index = 0
+    new_arr = []
+
+    arr.each do |item|
+      if curr_index == rand_index
+        shuf.push item
+      else
+        new_arr.push item
+      end
+
+      curr_index = curr_index + 1
+    end
+
+    arr = new_arr
+  end
+
+  shuf
+end
+
+puts shuffle [10,11,12,13,14,15,16,17,18,19,20]

ch10-nothing-new/sort.rb

@@ -1,3 +1,11 @@
 def sort arr
-  # your code here
-end
+  return arr if arr.length <= 1
+
+  middle = arr.pop
+  less = arr.select{|x| x < middle}
+  more = arr.select{|x| x >= middle}
+
+  sort(less) + [middle] + sort(more)
+end
+
+puts(sort(['i', 'feel', 'like', 'dancing']).join(' '))

ch11-reading-and-writing/build_a_better_playlist.rb

@@ -1,3 +1,36 @@
 def music_shuffle filenames
-  # your code here
-end
+  filenames = filenames.sort
+  len = filenames.length
+
+  2.times do
+    l_index = 0
+    r_index = len/2
+    shuf = []
+
+    while shuf.length < len
+      if shuf.length%2 == 0
+        shuf.push(filenames[r_index])
+        r_index = r_index + 1
+      else
+        shuf.push(filenames[l_index])
+        l_index = l_index + 1
+      end
+    end
+
+    filenames = shuf
+  end
+
+  arr = []
+  cut = rand(len)
+  index = 0
+
+  while index < len
+    arr.push(filenames[(index+cut)%len])
+    index = index + 1
+  end
+
+  arr
+  end
+  songs = ['RayCharles/HitTheRoadJack', 'RayCharles/GeorgiaOnMyMind', 'RayCharles/IGotAWoman', 'ArethaFranklin/Respect', 'ArethaFranklin/NaturalWoman', 'ArethaFranklin/ISayALittlePrayer']
+
+  puts(music_shuffle(songs))

ch11-reading-and-writing/build_your_own_playlist.rb

@@ -1 +1,13 @@
-# your code here
+def shuffle arr
+  arr.shuffle
+end
+
+all_oggs = shuffle(Dir['**/*.ogg'])
+
+File.open 'playlist.m3u', 'w' do |f|
+  all_oggs.each do |ogg|
+    f.write ogg+"\n"
+  end
+end
+
+puts 'Done!'