Untitled

require 'rspec'

 

module InWords

 

  def in_words

    #conditional statements

    a = if self == 1_000_000_000_000

      "one trillion"

    elsif self >= 1_000_000_000    #self is greater to or equal to 1 Billion

      prefix = self / 1_000_000_000

      suffix = self - (prefix * 1_000_000_000)

      prefix.in_words_by_100 + " billion " + suffix.in_words

    elsif self >= 1_000_000   #self is greater to or equal to 1 Million

      prefix = self / 1_000_000

      suffix = self - (prefix * 1_000_000)

      prefix.in_words_by_100 + " million " + suffix.in_words

    elsif self >= 1_000   #self is greater to or equal to 1 thousand

      prefix = self / 1_000

      suffix = self - (prefix * 1_000)

      prefix.in_words_by_100 + " thousand " + suffix.in_words

    else

      self.in_words_by_100

    end

    a.split.join(' ')

  end

 

  def in_words_by_100()

    single= {0=>"",1=>"one",2=>"two",3=>"three",4=>"four",5=>"five",6=>"six", 7=>"seven",8=>"eight",9=>"nine"}

    teens = {11=>"eleven",12=>"twelve",13=>"thirteen",14=>"fourteen",15=>"fifteen",16=>"sixteen", 17=>"seventeen",18=>"eighteen",19=>"nineteen"}

    tens = {0=>"",1=>"ten",2=>"twenty",3=>"thirty",4=>"forty",5=>"fifty",6=>"sixty", 7=>"seventy",8=>"eighty",9=>"ninety"}

 

    if self<10

      single[self]

    elsif self.between?(11,19)

      teens[self]

    elsif self.between?(19,99)

      tens[self/10] + " " + single[self%10]

    elsif self%100 < 10 && self< 1000

      single[self/100] + " hundred " + single[self%100]

    elsif self%100 < 20 && self < 1000

      single[self/100] + " hundred " + teens[self%100]

    elsif self%100 >= 20 && self < 1000

      single[self/100] + " hundred " + tens[(self/10)%10] + " " + single[(self%100)%10]

    else

      puts self

      puts "Error"

    end

  end

end

 

class Fixnum

  include InWords

end

 

describe Fixnum do

  describe "in_words" do

    it "translates numbers less than ten" do

      4.in_words.should == "four"

    end

    it "translates the teens" do

      17.in_words.should == "seventeen"

    end

    it "translates numbers 20 through 99" do

      47.in_words.should == "forty seven"

      70.in_words.should == "seventy"

      77.in_words.should == "seventy seven"

    end

    it "translates numbers 100 through 999" do

      100.in_words.should == "one hundred"

      206.in_words.should == "two hundred six"

      613.in_words.should == "six hundred thirteen"

      992.in_words.should == "nine hundred ninety two"

    end

    it "translates one thousand up to one million" do

      1_000.in_words.should == "one thousand"

      1_849.in_words.should == "one thousand eight hundred forty nine"

      15_937.in_words.should == "fifteen thousand nine hundred thirty seven"

      352_947.in_words.should == "three hundred fifty two thousand nine hundred forty seven"

    end

    it "translates numbers one million up to one billion" do

     # 1_000_000.in_words.should == "one million"

      573_917_408.in_words.should == "five hundred seventy three million nine hundred seventeen thousand four hundred eight"

    end

    it "translates numbers one billion up to one trillion" do

      1_000_000_000.in_words.should == "one billion"

      719_471_920_483.in_words.should == "seven hundred nineteen billion four hundred seventy one million nine hundred twenty thousand four hundred eighty three"

    end

    it "translates one trillion" do

      1_000_000_000_000.in_words.should == "one trillion"

    end

  end

end