initial_pull_request

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
+
+  if (reply == 'yes' || reply == 'no')
+      if reply == 'yes'
+          answer = true
+      else 
+          answer = false
+      end
+      break
+  else 
+      puts 'Please answer "yes" or "no". '
+  end
+  end
+end
+load './ask.rb'

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

@@ -1,3 +1,13 @@
 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 +1,38 @@
 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 = roman + '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))

ch10-nothing-new/dictionary_sort.rb

@@ -1,3 +1,12 @@
-def dictionary_sort arr
-  # your code here
-end
+def dictionary_sort arr 
+    return arr if arr.length <= 1
+
+    middle = arr.pop
+    less = arr.select{|x| x.downcase < middle.downcase}
+    morr = arr.select{|x| x.downcase >= middle.downcase}
+
+    dictionary_sort(less) + [middle] + dictionary_sort(more)
+end
+
+words = ['can', 'feel', ' singing', 'lobster', 'banana']
+puts(dictionary_sort(words).join(''))

ch10-nothing-new/english_number.rb

@@ -1,3 +1,72 @@
 def english_number number
-  # your code here
+  if number < 0 
+      return 'Please enter a number that is not 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], ['nontillion', 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(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(62819273644748393029282)

ch10-nothing-new/english_number.txt

@@ -0,0 +1,72 @@
+def english_number number
+  if number < 0 
+      return 'Please enter a number that is not 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], ['nontillion', 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(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(62819273644748393029282)

ch10-nothing-new/ninety_nine_bottles_of_beer.rb

@@ -1 +1,14 @@
-# your code here
+require_relative 'english_number.rb'
+
+def plurals(num, word)
+num == "one" ? num + " " + word : num + " " + word + "s"
+end
+count = 999
+while count > 0
+  number_bottles = english_number(count)
+  bottles = plurals(number_bottles, "bottle")
+  puts "#{bottles.capitalize} of beers on the wall, #{bottles} of beer."
+  count -= 1
+  bottles = plurals(english_number(count), "bottle")
+  puts "Take one down and pass it around, #{bottles} of beer on the wall."
+end

ch10-nothing-new/shuffle.rb

@@ -1,3 +1,8 @@
-def shuffle arr
-  # your code here
-end
+meeshyep:~/workspace/Projects/learn_to_program/ch10-nothing-new (master) $ irb
+2.3.0 :001 > def shuffle arr
+2.3.0 :002?>   arr.sort_by{rand}
+2.3.0 :003?>   end
+ => :shuffle 
+2.3.0 :004 > p(shuffle([1,2,3,4,5,6,7,8,9,0]))
+[9, 0, 6, 8, 4, 3, 2, 1, 7, 5]
+ => [9, 0, 6, 8, 4, 3, 2, 1, 7, 5] 

ch10-nothing-new/sort.txt

@@ -0,0 +1,28 @@
+def sort arr
+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
+
+puts(sort(['I can', 'feel', 'singing', 'like', 'a', 'can']))
+

ch11-reading-and-writing/build_a_better_playlist.rb

@@ -1,3 +1,37 @@
 def music_shuffle filenames
-  # your code here
+  filenames - filenames.sort
+  len = filenames.length
+  else
+
+  2.times do  
+      l_idx = 0 
+      r_idx = len/2
+      shuf = []
+
+      while shuf.length < len
+      if shuf.length%2 == 0 
+          shuf.push(filenames[r_indx])
+          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 = ['aa/bbb', 'aa/ccc', 'aa/ddd', 'AAA/xxxx', 'AAA/yyy', 'AAA/zzzz' , 'foo/bar']
+  puts (music_shuffle(songs))
+end_of_input    

ch11-reading-and-writing/build_your_own_playlist.rb

@@ -1 +1,14 @@
-# your code here
+# your code here
+Dir.chdir '/meeshyep:~/workspace//Projects/learn_to_program/ch11-reading-and-writing/'
+music_files= Dir['*.mp3']
+puts music_files
+
+playlist_name=File.new("michelle_playlist.m3u", "w")
+
+def write_files object, filename
+   File.open filename, 'w' do |f|
+       f.write object.join("\n")
+    end
+end
+
+write_files(music_files, playlist_name)