
diff -r 3b9496db3fb9 -r 3390e863d796 coursework/cw02.tex
--- a/coursework/cw02.tex	Tue Sep 26 14:07:29 2017 +0100
+++ b/coursework/cw02.tex	Tue Sep 26 14:08:49 2017 +0100
@@ -6,7 +6,7 @@
 
 \section*{Coursework 2 (Strand 1)}
 
-\noindent This coursework is worth 5\% and is due on 4
+\noindent This coursework is worth 5\% and is due on 3
 November at 16:00. You are asked to implement the Sulzmann \&
 Lu lexer for the WHILE language. You can do the
 implementation in any programming language you like, but you
@@ -88,7 +88,7 @@
 
 \begin{center}
 \begin{tabular}{ll}
-$[c_1 c_2 \ldots c_n]$ & a range of characters\\
+$[c_1,c_2,\ldots,c_n]$ & a set of characters\\
 $r^+$ & one or more times $r$\\
 $r^?$ & optional $r$\\
 $r^{\{n\}}$ & n-times $r$\\
@@ -96,7 +96,7 @@
 \end{center}
 
 \noindent
-Later on you will also need the record regular expressions:
+Later on you will also need the record regular expression:
 
 \begin{center}
 \begin{tabular}{ll}
@@ -105,8 +105,9 @@
 \end{center}
 
 \noindent Try to design your regular expressions to be as
-small as possible. For example you should use character ranges
-for identifiers and numbers.
+small as possible. For example you should use character sets
+for identifiers and numbers. Feel free to use the general
+character constructor \textit{CFUN} introduced in CW 1.
 
 \subsection*{Question 2}
 
@@ -119,11 +120,11 @@
 
 \begin{center}
 \begin{tabular}{@ {}l@ {\hspace{2mm}}c@ {\hspace{2mm}}l@ {}}
-$mkeps([c_1 c_2 \ldots c_n])$  & $\dn$ & $?$\\
+$mkeps([c_1,c_2,\ldots,c_n])$  & $\dn$ & $?$\\
 $mkeps(r^+)$                   & $\dn$ & $?$\\
 $mkeps(r^?)$                   & $\dn$ & $?$\\
 $mkeps(r^{\{n\}})$             & $\dn$ & $?$\medskip\\
-$inj\, ([c_1 c_2 \ldots c_n])\,c\,\ldots$  & $\dn$ & $?$\\
+$inj\, ([c_1,c_2,\ldots,c_n])\,c\,\ldots$  & $\dn$ & $?$\\
 $inj\, (r^+)\,c\,\ldots$                   & $\dn$ & $?$\\
 $inj\, (r^?)\,c\,\ldots$                   & $\dn$ & $?$\\
 $inj\, (r^{\{n\}})\,c\,\ldots$             & $\dn$ & $?$\\
@@ -175,16 +176,12 @@
 
 
 \begin{figure}[p]
-\begin{center}
 \mbox{\lstinputlisting[language=while]{../progs/fib.while}}
-\end{center}
 \caption{Fibonacci program in the WHILE language.\label{fib}}
 \end{figure}
 
 \begin{figure}[p]
-\begin{center}
 \mbox{\lstinputlisting[language=while]{../progs/loops.while}}
-\end{center}
 \caption{The three-nested-loops program in the WHILE language. 
 Usually used for timing measurements.\label{loop}}
 \end{figure}




