Week_2

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

@@ -1,3 +1,13 @@
 def ask question
-  # your code here
+    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
+  puts "Oops! Try using a positive integer!" if num <= 0
+    roman = ''
+      roman << 'M' * (num / 1000)
+      roman << 'D' * (num % 1000 / 500)
+      roman << 'C' * (num % 500 / 100)
+      roman << 'L' * (num % 100 / 50)
+      roman << 'X' * (num % 50 / 10)
+      roman << 'V' * (num % 10 / 5)
+      roman << 'I' * (num % 5 / 1)
+
+  return roman
+end

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

@@ -1,3 +1,30 @@
 def roman_numeral num
-  # your code here
-end
+    roman = ""
+    roman = roman + "M" * (num / 1000)
+    if (900..999) === (num % 1000)
+        roman = roman + "CM"
+        elsif (400..499) === (num  % 500)
+        roman = roman + "CD"
+        else
+        roman = roman + "D" * ((num % 1000) / 500)
+        roman = roman + "C" * ((num % 500) / 100)
+    end
+    if (90..99) === (num % 100)
+        roman = roman + "XC"
+        elsif
+        (40..49) === (num % 50)
+        roman = roman + "XL"
+        else
+        roman = roman + "L" * ((num % 100) / 50)
+        roman = roman + "X" * ((num % 50) / 10)
+    end
+    if (num % 10) == 9
+        roman = roman + "IX"
+        elsif (num % 5) == 4
+        roman = roman + "IV"
+        else
+        roman = roman + "V" * ((num % 10) / 5)
+        roman = roman + "I" * ((num % 5) / 1)
+    end
+    roman
+end

ch10-nothing-new/Rite_passage.rb

@@ -0,0 +1,24 @@
+def some_array
+  recursive_sort some_array, []
+end
+
+def recursive_sort unsorted_array, sorted_array
+  if unsorted.length <= 0
+    return "Sorted"
+  end
+
+  smallest = unsorted_array.pop
+  still_unsorted =[]
+
+  unsorted_array each do |tested|
+    if tested < smallest
+      still_unsorted.push smallest
+      smallest = tested 
+    else
+      still_unsorted.push tested
+    end
+  end
+
+  sorted_array.push smallest
+
+end

ch10-nothing-new/dictionary_sort.rb

@@ -1,3 +1,21 @@
 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|
+    if tested.downcase < smallest.downcase
+      still_unsorted.push smallest
+      smallest = tested
+    else
+      still_unsorted.push tested
+    end
+  end
+  sorted.push smallest
+  rec_dict_sort still_unsorted, sorted
+end

ch10-nothing-new/english_number.rb

@@ -1,3 +1,58 @@
 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

ch10-nothing-new/ninety_nine_bottles_of_beer.rb

@@ -1 +1,14 @@
-# your code here
+num_at_start = 5
+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 +1,24 @@
 def shuffle arr
-  # your code here
-end
+    shuffled = []
+    while arr.length > 0
+        rand_index = rand(arr.length)
+
+        curr_index = 0
+        new_array =[]
+
+        arr.each do |item|
+            if curr_index == rand_index
+                shuffled.push item
+                else
+                new_array.push item
+            end
+
+            curr_index = curr_index + 1
+        end
+
+        arr = new_array
+    end
+    shuffled
+end
+
+puts shuffle [1, 2, 3, 4, 5, 6, 7]

ch10-nothing-new/sort.rb

@@ -1,3 +1,24 @@
 def sort arr
-  # your code here
-end
+    rec_sort arr, []
+end
+
+def rec_sort unsorted, sorted
+    if unsorted.length <= 0
+        return sorted
+    end
+
+    smallest = unsorted.pop
+    still_unsorted = []
+
+    unsorted.each do |tested_object|
+        if tested_object < smallest
+            still_unsorted.push smallest
+            smallest = tested_object
+        else
+            still_unsorted.push tested_object
+        end
+    end
+
+    sorted.push smallest
+    rec_sort still_unsorted, sorted
+end

ch11-reading-and-writing/build_a_better_playlist.rb

@@ -1,3 +1,48 @@
 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 % == 0
+        shuf.push(filenames[r_idx])
+        r_idx = r_idx + 1
+      else
+        shuf.push(filenames[r_idx])
+        r_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
+
+
+
+
+
+
+
+
+
+
+
+
+
+  end
 end

ch11-reading-and-writing/build_your_own_playlist.rb

@@ -1 +1,7 @@
-# your code here
+# your code here
+songs = shuffle(Dir["**/*.mp3"])
+File.open 'playlist.m3u', 'w' do |f|
+    songs.each do |mp3|
+        f.write mp3 + "/n"
+    end
+end

ch11-reading-and-writing/safer_picture_downloading.rb

@@ -1 +1,23 @@
-# your code here
+pic_names = Dir["**/*.{JPG,jpg}"]
+puts "How would you want to call this batch?"
+batch_name = gets.chomp
+puts
+puts "Downloading #{pic_names.length} files"
+pic_number = 1
+pic_names.each do |name|
+    print "."
+    new_name = if pic_number < 10
+    "#{batch_name}0#{pic_number}.jpg"
+    else
+    "#{batch_name}#{pic_number}.jpg"
+end
+if File.exist?(new_name) == true
+    puts "Sorry, but you would be overwriting a picture!"
+    exit
+    else
+    File.rename name, new_name
+    pic_number = pic_number + 1
+end
+end
+
+puts "Your batch have been saved with the following name: #{batch_name}!"

ch12-new-classes-of-objects/birthday_helper.rb

@@ -1 +1,23 @@
-# your code here
+birth_dates = {}
+File.read("birthdates.txt").each_line do |line|
+  line = line.chomp
+
+  first_comma = 0
+  while line[first_comma] != "," && first_comma < line.length
+    first_comma = first_comma + 1
+  end
+
+  name = line[0..(first_comma - 1)]
+  date = line[-12..-1]
+  birth_dates[name] = name
+end
+
+puts "Whose birthday would you like to know?"
+name = gets.chomp
+date = birth_dates[name]
+
+if date == nil
+  puts "Oooh, I don't know that one..."
+else
+  puts date [0..5]
+end

ch12-new-classes-of-objects/happy_birthday.rb

@@ -1 +1,18 @@
+puts "Which year did you get born?"
+year = gets.chomp.to_i
+puts "Which month did you get born? Please give it in a numerical way (1-12)"
+month = gets.chomp.to_i
+puts "Which day did you get born?"
+day = gets.chomp.to_i
+
+
+birthday = Time.local(year, month, day)
+older = 1
+now = Time.new
+
+
+while Time.local(year + older, month, day) < now
+    puts "PRANK!!"
+    older = older + 1
+end
 # your code here

ch12-new-classes-of-objects/one_billion_seconds.rb

@@ -1 +1,4 @@
-# your code here
+time = Time.gm(1989, 5, 18)
+time2 = time + 1000000000
+puts time
+puts time2