Solution to codingchallenge2015

.gitignore

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+
+# Created by https://www.gitignore.io/api/ruby
+
+### Ruby ###
+*.gem
+*.rbc
+/.config
+/coverage/
+/InstalledFiles
+/pkg/
+/spec/reports/
+/spec/examples.txt
+/test/tmp/
+/test/version_tmp/
+/tmp/
+
+## Specific to RubyMotion:
+.dat*
+.repl_history
+build/
+
+## Documentation cache and generated files:
+/.yardoc/
+/_yardoc/
+/doc/
+/rdoc/
+
+## Environment normalisation:
+/.bundle/
+/vendor/bundle
+/lib/bundler/man/
+
+# for a library or gem, you might want to ignore these files since the code is
+# intended to run in multiple environments; otherwise, check them in:
+# Gemfile.lock
+# .ruby-version
+# .ruby-gemset
+
+# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
+.rvmrc
+

lib/solution.rb

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+# The hundred_to_word method accepts an integer above 0 and below 1 thousand
+# and returns a string representation of the number in english numerics
+def hundred_to_word(number)
+
+  # The numerics hash contains all translations of integer numbers to english
+  # numeric string values assuming that they do not require composition
+  numeric = {
+    1 => "one", 2 => "two", 3 => "three", 4 => "four", 5 => "five", 6 => "six",
+    7 => "seven", 8 => "eight", 9 => "nine", 10 => "ten", 11 => "eleven",
+    12 => "twelve", 13 => "thirteen", 14 => "fourteen", 15 => "fifteen",
+    16 => "sixteen", 17 => "seventeen", 18 => "eighteen", 19 => "nineteen",
+    20 => "twenty", 30 => "thirty", 40 => "forty", 50 => "fifty", 60 => "sixty",
+    70 => "seventy", 80 => "eighty", 90 => "ninety"
+  }
+
+  # Divide the number by 100 to receive a single digit representing the
+  # hundreth value.
+  hundred = number / 100
+
+  # Initiate the result string to the numeric translation of the hundred value
+  # unless this value is equal to 0. In that case, initiate to an empty string.
+  result = hundred != 0 ? "#{numeric[hundred]} hundred " : ""
+
+  # Apply the modulus of 100 operation to the number in order to receive the two
+  # digits representing the tens value.
+  tens = number % 100
+
+  # Append the numeric string value of the remaining two digits to the result
+  # string. If the remaining numbers exists as a key within the numeric hash,
+  # then append the translation to the result.
+  if numeric.keys.include?(tens)
+    result += "#{numeric[tens]}"
+
+  # If the value of tens is not present in the numeric.keys then decompose the
+  # number until the values are included in the numeric.keys.
+  else
+
+    # Remove the trailing digit for the tens digit and append a 0
+    tens = (tens / 10) * 10
+
+    # Capture the ones digit by applying the modulus of 10 operation to the number
+    ones = number % 10
+
+    # Append the composite translation of tens and ones to and ommit the tens
+    # value if it is equal to 0
+    result += "#{numeric[tens] unless tens == 0} #{numeric[ones]}"
+  end
+
+  # Return the result string after calling the #strip method which removes
+  # leading and trailing white spaces
+  result.strip
+end
+
+# The int_to_word method accepts an integer above 0 and below 1 billion
+# and returns a string representation of the number in english numerics
+def int_to_word(number)
+
+  # Dividing the number by a million returns the three digits containing millions
+  million = number / 1000000
+
+  # Dividing the number by a thousand returns 6 digits including the thousands
+  # and hundreds. The hundred value digits are trimmed by applying the modulus
+  # operation of the value of 'million'.
+  thousand = (number / 1000) % 1000
+
+  # Applying the modulus operation of 1000 returns the three digits representing
+  # the hundred values
+  hundred = number % 1000
+
+  # Initiate the result string with the million string value unless the million
+  # value is equal to 0. If million is equal to 0, return an empty string.
+  result = million != 0 ? "#{hundred_to_word(million)} million " : ""
+
+  # Append the string values for thousand and for hundred. Ignore the operation
+  # if a value is equal to 0
+  result += "#{hundred_to_word(thousand)} thousand " unless thousand == 0
+  result += "#{hundred_to_word(hundred)}" unless hundred == 0
+
+  # Return the result string after calling the #strip method which removes
+  # leading and trailing white spaces
+  result.strip
+end

spec/solution_spec.rb

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+require "spec_helper"
+
+describe "solution.rb" do
+
+  describe "#hundred_to_word" do
+
+    it "returns 300 as three hundred" do
+      expect(hundred_to_word(300)).to eq("three hundred")
+    end
+
+    it "returns 750 as seven hundred fifty" do
+      expect(hundred_to_word(750)).to eq("seven hundred fifty")
+    end
+
+    it "returns 45 as forty five" do
+      expect(hundred_to_word(45)).to eq("forty five")
+    end
+
+  end
+
+  # Specifications as provided by the projects README.md file
+  describe "#int_to_word" do
+
+    it "returns 4527 as four thousand five hundred twenty seven" do
+      expect(int_to_word(4527)).to eq("four thousand five hundred twenty seven")
+    end
+
+    it "returns 200017 as two hundred thousand seventeen" do
+      expect(int_to_word(200017)).to eq("two hundred thousand seventeen")
+    end
+
+    it "returns 784 as seven hundred eighty four" do
+      expect(int_to_word(784)).to eq("seven hundred eighty four")
+    end
+
+    it "returns 1000215 as one million two hundred fifteen" do
+      expect(int_to_word(1000215)).to eq("one million two hundred fifteen")
+    end
+
+  end
+
+end

spec/spec_helper.rb

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+require_relative "../lib/solution"