Completed the remainder of CP's exercises.

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

@@ -1,3 +1,30 @@
 def ask question
-  # your code here
-end
+  while true 
+    puts question
+    reply = gets.chomp.downcase
+
+    if (reply == "yes" || reply == "no")
+        if reply == "yes"
+             return true
+        else
+             return false
+        end
+        break
+    else
+        puts "Please answer \"yes\" or \"no\"."
+    end
+  end
+end
+puts "Hello, and thank you for participating in this survey."
+puts
+
+ask "Do you like eating tacos?"
+ask "Do you like eating burritos?"
+wets_bed = ask "Do you wet the bed?"
+ask "Do you like eating chimichangas?"
+
+puts
+puts "DEBRIEFING:"
+puts "Thank you for your time."
+puts
+puts wets_bed

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

@@ -1,3 +1,12 @@
-def old_roman_numeral num
-  # your code here
-end
+def old_roman number
+	roman = ''
+	roman += 'M' * (number/1000)
+	roman += 'D' * (number % 1000/500)
+	roman += 'C' * (number % 500/100)
+	roman += 'L' * (number % 100/50)
+	roman += 'X' * (number % 50/10)
+	roman += 'V' * (number % 10/ 5)
+	roman += 'I' * (number % 5)
+end
+
+puts old_roman(1209)

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

@@ -1,3 +1,55 @@
-def roman_numeral num
-  # your code here
-end
+def old_roman_numeral number
+
+  i = 0
+  v = 0
+  x = 0
+  l = 0
+  c = 0
+  d = 0
+  m = 0
+
+  if number >= 1000
+    m = number/1000
+    number = number % 1000
+  end
+
+  if number >= 500
+    d = number/500
+    number = number % 500
+  end
+
+  if number >= 100
+    c = number/100
+    number = number % 100
+  end
+
+  if number >= 50
+    l = number/50
+    number = number % 50
+  end
+
+  if number >= 10
+    x = number/10
+    number = number % 10
+  end
+
+  if number >= 5
+    v = number/5
+    number = number % 5
+  end
+
+  if number < 5
+    i = number/1
+    number = number % 10
+  end
+
+puts ("M" * m) + ("D" * d) + ("C" * c) + ("L" * l) + ("X" * x) + ("V" * v) + ("I" * i)
+
+end
+
+puts "Enter a number, and I'll convert it into an old-school Roman numeral"
+
+reply = gets.chomp
+
+puts "The number " + reply.to_s + " in old-school Roman numerals is:"
+old_roman_numeral reply.to_i

ch10-nothing-new/dictionary_sort.rb

@@ -1,3 +1,16 @@
-def dictionary_sort arr
-  # your code here
-end
+def sort(some_array)
+	recursive_sort(some_array, [])
+end
+
+def recursive_sort(unsorted_array, sorted_array)
+	smallest = unsorted_array.reduce { |memo, word|  memo.downcase < word.downcase ? memo : word}
+	unsorted_array.delete_at(unsorted_array.index(smallest))
+	sorted_array << smallest
+	if unsorted_array.length > 0
+		recursive_sort(unsorted_array, sorted_array)
+	else
+		sorted_array
+	end
+end
+
+puts sort(["Blue", "red", "pink", "Yellow", "Purple", "green"])

ch10-nothing-new/english_number.rb

@@ -1,3 +1,98 @@
 def english_number number
-  # your code here
-end
+  if number < 0
+    return 'Please enter a numberwith a value higher than zero'
+  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']
+
+  large_n   = [['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 large_n.length > 0
+    zil_pair = large_n.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

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 numberwith a value higher than zero'
+  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']
+
+  large_n   = [['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 large_n.length > 0
+    zil_pair = large_n.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 = 40
+num_now = num_at_start
+while num_now > 1
+  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

ch10-nothing-new/shuffle.rb

@@ -1,3 +1,5 @@
 def shuffle arr
-  # your code here
-end
+	arr.sort_by{rand}
+end
+
+puts (shuffle ([4, 10, 9, 8, 400, 252]))

ch10-nothing-new/sort.rb

@@ -1,3 +1,13 @@
 def sort arr
-  # your code here
+
+  return arr if arr.length <= 1
+
+  first = arr[0]
+  arr.delete_at(0)
+
+  higher = arr.select {|a| a > first}
+  lower = arr.select {|a| a <= first}
+
+  sort(lower) + [first] + sort(higher)
+
 end