
diff -r ecd989eee8bd -r 59779ce322a6 cws/cw07.tex
--- a/cws/cw07.tex	Wed Mar 20 21:50:20 2019 +0000
+++ b/cws/cw07.tex	Sat Jun 22 08:39:52 2019 +0100
@@ -4,22 +4,24 @@
 
 \begin{document}
 
-\section*{Replacement Coursework 1 (Roman Numerals)}
+\section*{Scala Part (Roman Numerals)}
 
-This coursework is worth 10\%. It is about translating roman numerals
-into integers and also about validating roman numerals.  The coursework
-is due on 2 February at 5pm.  Make sure the files you submit can be
-processed by just calling \texttt{scala <<filename.scala>>}.\bigskip
+This coursework is worth 50\%. It is about translating roman numerals
+into integers.  Make sure the files you submit can be
+processed by just calling
+
+\begin{center}
+  \texttt{scala <<filename.scala>>}
+\end{center}%\bigskip
 
 \noindent
 \textbf{Important:} Do not use any mutable data structures in your
 submission! They are not needed. This menas you cannot use 
-\texttt{ListBuffer}s, for example. Do not use \texttt{return} in your
+\texttt{ListBuffer}s, \texttt{Array}s, for example. Do not use \texttt{return} in your
 code! It has a different meaning in Scala, than in Java.  Do not use
 \texttt{var}! This declares a mutable variable.  Make sure the
 functions you submit are defined on the ``top-level'' of Scala, not
-inside a class or object. Also note that the running time will be
-restricted to a maximum of 360 seconds on my laptop.
+inside a class or object. 
 
 
 \subsection*{Disclaimer}
@@ -30,7 +32,7 @@
 you can freely use.\bigskip
 
 
-\subsection*{Part 1 (Translation)}
+\subsection*{Tasks}
 
 \noindent
 Roman numerals are strings consisting of the letters $I$, $V$, $X$,
@@ -42,7 +44,7 @@
 \begin{itemize}
 \item[(1)] First write a polymorphic function that recursively
   transforms a list of options into an option of a list. For example,
-  if you have the lists on the left-hand side, they should be transformed into
+  if you have the lists on the left-hand side below, they should be transformed into
   the options on the right-hand side:
 
   \begin{center}
@@ -58,12 +60,12 @@
   This means the function should produce \texttt{None} as soon
   as a \texttt{None} is inside the list. Otherwise it produces
   a list of all \texttt{Some}s. In case the list is empty, it
-  produces \texttt{Some} of the empty list. \hfill[1 Mark]
+  produces \texttt{Some} of the empty list. \hfill[15\% Marks]
 
  
 \item[(2)] Write first a function that converts the characters $I$, $V$,
   $X$, $L$, $C$, $D$, and $M$ into an option of a \texttt{RomanDigit}.
-  If it is one of the roman digits, it should produce \texttt{Some};
+  If the input is one of the roman digits, the function should produce \texttt{Some};
   otherwise \texttt{None}.
   
   Next write a function that converts a string into a
@@ -74,12 +76,12 @@
   \texttt{None}. The empty string is just the empty
   \texttt{RomanNumeral}, that is the empty list of
   \texttt{RomanDigit}'s.  You should use the function under Task (1)
-  to produce the result.  \hfill[2 Marks]
+  to produce the result.  \hfill[15\% Marks]
 
 \item[(3)] Write a recursive function \texttt{RomanNumral2Int} that
   converts a \texttt{RomanNumeral} into an integer. You can assume the
   generated integer will be between 0 and 3999.  The argument of the
-  function is a list of roman digits. It should look how this list
+  function is a list of roman digits. It should analyse how this list
   starts and then calculate what the corresponding integer is for this
   ``start'' and add it with the integer for the rest of the list. That
   means if the argument is of the form shown on the left-hand side, it
@@ -103,27 +105,29 @@
   \end{tabular}  
   \end{center}    
 
-  The empty list will be converted to integer $0$.\hfill[1 Mark]
+  The empty list will be converted to integer $0$.\hfill[10\% Mark]
   
-\item[(4)] Write a function that takes a string and if possible
-  converts it into the internal representation. If successful, it then
-  calculates the integer (an option of an integer) according to the
+\item[(4)] Write a function that takes a string as input and if possible
+  converts it into the internal representation of Roman Numerals. If successful, it then
+  calculates the corresponding integer (actually an option of an integer) according to the
   function in (3).  If this is not possible, then return
-  \texttt{None}.\hfill[1 Mark]
+  \texttt{None}.\\
+  \mbox{}\hfill[10\% Mark]
 
 
-\item[(5)] The file \texttt{roman.txt} contains a list of roman numerals.
-  Read in these numerals, convert them into integers and then add them all
-  up. The Scala function for reading a file is
-
-  \begin{center}
-  \texttt{Source.fromFile("filename")("ISO-8859-9")}
-  \end{center}
-
-  Make sure you process the strings correctly by ignoring whitespaces
-  where needed.\\ \mbox{}\hfill[1 Mark]
+%\item[(5)] The file \texttt{roman.txt} contains a list of roman numerals.
+%  Read in these numerals, convert them into integers and then add them all
+%  up. The Scala function for reading a file is
+%
+%  \begin{center}
+%  \texttt{Source.fromFile("filename")("ISO-8859-9")}
+%  \end{center}
+%
+%  Make sure you process the strings correctly by ignoring whitespaces
+%  where needed.\\ \mbox{}\hfill[1 Mark]
 \end{itemize}
 
+\end{document}
 
 \subsection*{Part 2 (Validation)}
 




