diff -r d39b8733c6ea -r 293ea84d82ca progs/roman.scala
--- a/progs/roman.scala	Thu Jan 26 01:43:31 2017 +0000
+++ b/progs/roman.scala	Fri Jan 27 14:55:56 2017 +0000
@@ -115,3 +115,35 @@
 
 // Part 2 about Validation of Roman Numerals
 //===========================================
+
+// (6) Write a function that validates roman numerals according
+// to the rules given in the CW.
+
+def isValidNumeral(digitList: RomanNumeral): Boolean =
+
+
+
+// some test cases
+val invalids = List("IXC", "XCX", "IIII", "IIIII", "DD", "VL", 
+                    "MIM", "XXCIII", "LXXIIX", "IIIIX", "IIXX", 
+                    "ICM", "CIM", "VIV", "IVX", "MCMC", "XIIX", "IIXX")
+
+val valids = List("IV", "VI", "IX", "MCMLXXIX", "MCMXLIV", "", "MDCLXI",
+                  "MMMCMXCIX", "XLVIII", "MMVIII", "MMXI", "MCMLVI", "III",
+                  "XXX", "CCC", "MMM", "VII", "LXVI", "CL", "MCC", "XC",
+                  "MDCLXVI")
+
+// (7) Write a recursive function that converts an Integer into a
+// a roman numeral. The input will be between 0 and 3999.
+
+def Int2Roman(n: Int): RomanNumeral =
+
+// (8) Write a function that reads a text file containing valid and 
+// invalid roman numerals. Convert all valid roman numerals into integers, 
+// add them up and produce the result as a roman numeral (using the 
+// function in (7)
+
+def addvalidromanfile(filename: String) =
+
+// a test case
+//addvalidromanfile("roman2.txt")