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Roman Numerals Kata
# Feb, 27th, 2012
# Kevin and Jared at Mad Railers
# run with rspec
require 'rubygems'
require 'rspec'
def roman(number)
output = ""
conversion_table = { 1000 => "M", 900 => "CM", 500 => "D", 400 => "CD", 100 => "C", 90 => "XC", 50 => "L", 40 => "XL", 10 => "X", 9 => "IX", 5 => "V", 4 => "IV", 1 => "I" }
leftover = number
conversion_table.each do |arabic, numeral|
quotient = leftover / arabic
remainder = leftover % arabic
if quotient > 0
output << numeral * quotient
end
leftover = remainder
end
output
end
describe 'roman numerals' do
it "returns 1" do
roman(1).should == "I"
end
it "returns 2" do
roman(2).should == "II"
end
it "returns 3" do
roman(3).should == "III"
end
it "returns 4" do
roman(4).should == "IV"
end
it "returns 5" do
roman(5).should == "V"
end
it "returns 6" do
roman(6).should == "VI"
end
it "returns 7" do
roman(7).should == "VII"
end
it "returns 9" do
roman(9).should == "IX"
end
it "returns 10" do
roman(10).should == "X"
end
it "returns 11" do
roman(11).should == "XI"
end
it "returns 14" do
roman(14).should == "XIV"
end
it "returns 17" do
roman(17).should == "XVII"
end
it "returns 37" do
roman(37).should == "XXXVII"
end
it "returns 40" do
roman(40).should == "XL"
end
it "returns 42" do
roman(42).should == "XLII"
end
it "returns 51" do
roman(51).should == "LI"
end
it "returns 100" do
roman(100).should == "C"
end
it "returns 101" do
roman(101).should == "CI"
end
it "returns 556" do
roman(556).should == "DLVI"
end
it "returns 1205" do
roman(1205).should == "MCCV"
end
it "returns 88" do
roman(88).should == "LXXXVIII"
end
it "returns 999" do
roman(999).should == "CMXCIX"
end
end
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