From 1d27472553c2f9727ba02836dd10ba0ddb7e0d95 Mon Sep 17 00:00:00 2001
From: "exercism-solutions-syncer[bot]"
 <211797793+exercism-solutions-syncer[bot]@users.noreply.github.com>
Date: Mon, 4 Aug 2025 10:15:27 +0000
Subject: [PATCH] [Sync Iteration] elixir/roman-numerals/2

---
 .../roman-numerals/2/lib/roman_numerals.ex    | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 solutions/elixir/roman-numerals/2/lib/roman_numerals.ex

diff --git a/solutions/elixir/roman-numerals/2/lib/roman_numerals.ex b/solutions/elixir/roman-numerals/2/lib/roman_numerals.ex
new file mode 100644
index 0000000..0b4bea3
--- /dev/null
+++ b/solutions/elixir/roman-numerals/2/lib/roman_numerals.ex
@@ -0,0 +1,39 @@
+defmodule RomanNumerals do
+  @doc """
+  Convert the number to a roman number.
+  """
+  @spec numeral(pos_integer) :: String.t()
+  def numeral(number), do: reduce_to_roman(number)
+
+  defp reduce_to_roman(number, numeral \\ "")
+  defp reduce_to_roman(0, numeral), do: numeral
+  defp reduce_to_roman(number, numeral) when number >= 1000,
+    do: reduce_to_roman(number - 1000, numeral <> "M")
+    
+  defp reduce_to_roman(number, numeral) when number >= 500 and number < 900,
+    do: reduce_to_roman(number - 500, numeral <> "D")
+    
+  defp reduce_to_roman(number, numeral) when number >= 900 or number >= 400,
+    do: reduce_to_roman(number + 100, numeral <> "C")
+    
+  defp reduce_to_roman(number, numeral) when number >= 100,
+    do: reduce_to_roman(number - 100, numeral <> "C")
+
+  defp reduce_to_roman(number, numeral) when number >= 50 and number < 90,
+    do: reduce_to_roman(number - 50, numeral <> "L")
+
+  defp reduce_to_roman(number, numeral) when number >= 90 or number >= 40,
+    do: reduce_to_roman(number + 10, numeral <> "X")
+
+  defp reduce_to_roman(number, numeral) when number >= 10,
+    do: reduce_to_roman(number - 10, numeral <> "X")
+
+  defp reduce_to_roman(number, numeral) when number >= 5 and number < 9,
+    do: reduce_to_roman(number - 5, numeral <> "V")
+
+  defp reduce_to_roman(number, numeral) when number == 9 or number == 4,
+    do: reduce_to_roman(number + 1, numeral <> "I")
+
+  defp reduce_to_roman(number, numeral) when number > 0,
+    do: reduce_to_roman(number - 1, numeral <> "I")
+end