Here is my shot.
Best to you all,
Izi
-------------------- Cut here
require 'test/unit'
# Convert a number [0..999] to how it should be written in English.
class NumberToEnglish
def initialize
@ones = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
@tens_10_to_19 = ['ten', 'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen']
@tens_20_to_99 = ['twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety']
@hundered = 'hundered'
end
def english_0_to_9 number
return @ones[number]
end
def english_10_to_19 number
return @tens_10_to_19[number - 10]
end
def english_0_to_19 number
return english_0_to_9(number) if number < 10
english_10_to_19 number
end
def english_20_to_99 number
ones_part = number % 10
tens_part = number / 10 - 2
head = @tens_20_to_99[tens_part]
return head if ones_part == 0
head + '-' + english_0_to_9(ones_part)
end
def english_0_to_99 number
return english_0_to_19(number) if number < 20
english_20_to_99 number
end
def english_100_to_999 number
hundereds_part = number / 100
rest_part = number % 100
head = @ones[hundereds_part] + ' ' + @hundered
return head if rest_part == 0
head + ' and ' + english_0_to_99(number % 100)
end
def english_0_to_999 number
return english_0_to_99(number) if number < 100
english_100_to_999 number
end
def english number
english_0_to_999(number)
end
end
class NumberToEnglishTest < Test::Unit::TestCase
def setup
@numberToEnglish = NumberToEnglish.new
end
def test_1
assert_equal('zero', @numberToEnglish.english(0))
assert_equal('one', @numberToEnglish.english(1))
assert_equal('nine', @numberToEnglish.english(9))
assert_equal('ten', @numberToEnglish.english(10))
assert_equal('seventeen', @numberToEnglish.english(17))
assert_equal('twenty', @numberToEnglish.english(20))
assert_equal('fifty-seven', @numberToEnglish.english(57))
assert_equal('ninety-nine', @numberToEnglish.english(99))
assert_equal('one hundered', @numberToEnglish.english(100))
assert_equal('one hundered and ninety-four', @numberToEnglish.english(194))
assert_equal('two hundered', @numberToEnglish.english(200))
assert_equal('two hundered and one', @numberToEnglish.english(201))
assert_equal('three hundered and ninety-two', @numberToEnglish.english(392))
assert_equal('five hundered and twenty-three', @numberToEnglish.english(523))
assert_equal('seven hundered and seventy-seven', @numberToEnglish.english(777))
assert_equal('eight hundered and forty-four', @numberToEnglish.english(844))
assert_equal('nine hundered and forty-three', @numberToEnglish.english(943))
end
end
# My (hopefully right) solution of Ruby Quiz 138.
class RQ138
def initialize
@numberToEnglish = NumberToEnglish.new
end
def say_it counts
str = ''
counts.sort.each do |k, v|
str += @numberToEnglish.english(v) + ' ' + k + ' '
end
str.chomp
end
def unwind str
only_letters = str.gsub /[^a-z]/, ''
sorted_str = only_letters.split('').sort
counts = {}
sorted_str.each do |char|
if counts[char] == nil
counts[char] = 1
else
counts[char] += 1
end
end
say_it counts
end
def find_seq str
seq = [str]
1.upto 10000 do
unwound = unwind seq[seq.length - 1]
index = seq.index(unwound)
seq << unwound
return [seq.length + 1, seq.length - index, seq] if index != nil
end
nil # Give up...
end
end
class RQ138Test < Test::Unit::TestCase
def setup
@rq138 = RQ138.new
end
def test_1
# WARNING: These are not real tests, since I didn't validate the results.
assert_equal [609, 430], @rq138.find_seq('LOOK AND SAY'.downcase)[0..1]
assert_equal [404, 67], @rq138.find_seq('A'.downcase)[0..1] # No letter A in numbers 0 - 9.
assert_equal [404, 67], @rq138.find_seq('B'.downcase)[0..1]
assert_equal [519, 317], @rq138.find_seq('E'.downcase)[0..1]
assert_equal [152, 76], @rq138.find_seq('ROMANCE'.downcase)[0..1] # Romance is very short,
assert_equal [482, 317], @rq138.find_seq('LOVE'.downcase)[0..1] # proof that love can last extremely long,
assert_equal [92, 46], @rq138.find_seq('LINUX'.downcase)[0..1] # Linux is very fast,
assert_equal [783, 95], @rq138.find_seq('RUBY'.downcase)[0..1] # while Ruby stands very high.
assert_equal [693, 160], @rq138.find_seq('izi_ttm')[0..1] # Don't know what I should say about myself,
assert_equal [266, 160], @rq138.find_seq('Nikola Tesla'.downcase)[0..1] # but I sure have at least something in common with Nikola Tesla. 
end
end
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