# HG changeset patch
# User Christian Urban <christian dot urban at kcl dot ac dot uk>
# Date 1384130054 0
# Node ID 9ce2414e470ed2abade33bba1068f8216fc34333
# Parent  1f98d215df712a237d38c170782f4bc4e742361e
added

diff -r 1f98d215df71 -r 9ce2414e470e coursework/cw02.pdf
Binary file coursework/cw02.pdf has changed
diff -r 1f98d215df71 -r 9ce2414e470e coursework/cw02.tex
--- a/coursework/cw02.tex	Sun Nov 10 09:27:01 2013 +0000
+++ b/coursework/cw02.tex	Mon Nov 11 00:34:14 2013 +0000
@@ -133,10 +133,30 @@
 \subsection*{Question 3 (marked with 1\%)}
 
 Write a program in the WHILE programming language that prints out all prime numbers between
-0 and a fixed number (say 100). Take the grammar of this language from the lectures. As another 
-guidance have a look at the Fibonacci program
-and ``three-nested-loops'' program shown below. For example, printing a variable \texttt{x} in the 
-WHILE language can be done by using the command \mbox{\texttt{write x}}. 
+0 and a fixed number (say 100). A partial grammar of the WHILE language is given below. 
+
+\begin{center}
+\begin{tabular}{@{}lcl@{}}
+\textit{Stmt} & $\rightarrow$ &  $\texttt{skip}$\\
+              & $|$ & \textit{Id}\;\texttt{:=}\;\textit{AExp}\\
+              & $|$ & \texttt{if}\; \textit{BExp} \;\texttt{then}\; \textit{Block} \;\texttt{else}\; \textit{Block}\\
+              & $|$ & \texttt{while}\; \textit{BExp} \;\texttt{do}\; \textit{Block}\\
+              & $|$ & \texttt{read}\;\textit{Id}\\
+              & $|$ & \texttt{write}\;\textit{Id}\\
+              & $|$ & \texttt{write}\;\textit{String}\medskip\\
+\textit{Stmts} & $\rightarrow$ &  \textit{Stmt} \;\texttt{;}\; \textit{Stmts}\\
+              & $|$ & \textit{Stmt}\medskip\\
+\textit{Block} & $\rightarrow$ &  \texttt{\{}\,\textit{Stmts}\,\texttt{\}}\\
+                & $|$ & \textit{Stmt}\medskip\\
+\textit{AExp} & $\rightarrow$ & \ldots\\
+\textit{BExp} & $\rightarrow$ & \ldots\\
+\end{tabular}
+\end{center}
+
+\noindent
+As another guidance for your program have a look at the Fibonacci program
+and ``three-nested-loops'' program shown below in Figures \ref{fib} and \ref{loop}. 
+
 
 \begin{figure}[h]
 \begin{center}
diff -r 1f98d215df71 -r 9ce2414e470e progs/fib.while
--- a/progs/fib.while	Sun Nov 10 09:27:01 2013 +0000
+++ b/progs/fib.while	Mon Nov 11 00:34:14 2013 +0000
@@ -1,4 +1,4 @@
-/* Fibonnacci sequence implemented in 
+/* Fibonnacci numbers implemented in 
    the WHILE language */
    
 write "Input a number ";
diff -r 1f98d215df71 -r 9ce2414e470e progs/loops.while
--- a/progs/loops.while	Sun Nov 10 09:27:01 2013 +0000
+++ b/progs/loops.while	Mon Nov 11 00:34:14 2013 +0000
@@ -1,4 +1,4 @@
-start := 1000;
+start := 1000;   // start value
 x := start;
 y := start;
 z := start;