Chp 9 Ask exercise

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

@@ -1,3 +1,18 @@
 def ask question
-  # your code here
-end
+  while true
+    puts question
+    reply = gets.chomp.downcase
+
+    return true if reply == 'yes'
+    return false if reply == 'no'
+
+    puts 'Please answer "yes" or "no".'
+  end
+  answer
+end
+
+ask 'Do you wanna dance?'
+ask 'Do you wanna sleep?'
+ask 'Do you wanna eat?'
+likes_it = ask 'Do you wanna eat tacos?'
+puts likes_it

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

@@ -1,3 +1,16 @@
 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 2457
+puts old_roman_numeral 13
+puts old_roman_numeral 1952

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

@@ -1,3 +1,39 @@
 def roman_numeral num
-  # your code here
-end
+  thousands = (num / 1000)
+  hundreds = (num % 1000 / 100)
+  tens  = (num % 100 / 10)
+  ones  = (num % 10)
+
+  roman = 'M' * thousands
+
+  if hundreds == 9
+    roman = roman + 'CM'
+  elsif hundreds == 4
+    roman = roman + 'CD'
+  else
+    roman = roman + 'D' * (num % 1000 / 500)
+    roman = roman + 'C' * (num % 500 / 100)
+  end
+
+  if tens == 9
+    roman = roman + 'XC'
+  elsif tens == 4
+    roman = romann + 'XL'
+  else
+    roman = roman + 'L' * (num % 100 / 50)
+    roman = roman + 'X' * (num % 50 / 10)
+  end
+
+  if ones == 9
+    roman = roman + 'IX'
+  elsif ones == 4
+    roman = roman + 'IV'
+  else
+    roman = roman + 'V' * (num % 10 / 5)
+    roman = roman + 'I' * (num % 5 / 1)
+  end
+  roman
+end
+
+puts(roman_numeral(1999))
+puts (roman_numeral(99))

ch10-nothing-new/dictionary_sort.rb

@@ -1,3 +1,27 @@
 def dictionary_sort arr
-  # your code here
-end
+    rec_dict_sort arr, []
+  end
+
+  def rec_dict_sort unsorted, sorted
+    if unsorted.length <= 0
+      return sorted
+    end
+
+    smallest = unsorted.pop
+    still_unsorted = []
+
+    unsorted.each do |tested_object|
+      if tested_object.downcase < smallest.downcase
+        still_unsorted.push smallest
+        smallest = tested_object
+      else
+        still_unsorted.push tested_object
+      end
+    end
+
+    sorted.push smallest
+
+    rec_dict_sort still_unsorted, sorted
+  end
+
+puts(dictionary_sort([' space' ,' time' ,' continuum' ,' countdown' ,' space' ,' blastoff' ]))

ch10-nothing-new/english_number.rb

@@ -1,3 +1,102 @@
 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( 0)
+puts english_number( 8)
+puts english_number( 13)
+puts english_number( 23)
+puts english_number(2001)
+puts english_number(99999)
+puts english_number(2000000000500)
+puts english_number(109236225102938986129834709285360238475667874561034)

ch10-nothing-new/ninety_nine_bottles_of_beer.rb

@@ -1 +1,108 @@
-# 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 = 99
+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 +1,27 @@
 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 ([5,6,7,8,9,10,11,12]))

ch11-reading-and-writing/build_a_better_playlist.rb

@@ -1,3 +1,34 @@
 def music_shuffle filenames
-  # your code here
+  filenames = filenames.sort
+  len = filenames.length
+
+  2.times do
+    l_idx = 0
+    r_idx = len/2
+    shuf = []
+
+    while shuf.length < len
+      if shuf.length%2 == 0
+        shuf.push(filenames[r_idx])
+        r_idx = r_idx + 1
+      else
+        shuf.push(filenames[l_idx])
+        l_idx = l_idx + 1
+      end
+    end
+
+    filenames = shuf
+  end
+  arr = []
+  cut = rand(len)
+  idx = 0
+
+  while idx < len
+    arr.push(filenames[(idx+cut)%len])
+    idx = idx + 1
+  end
+
+  arr
 end
+songs = ['Sorry', 'Hold Up', 'Freedom','6 inch', 'Daddy Lessons', 'Don\'t Hurt Yourself']
+puts(music_shuffle(songs))