--- a/progs/fun/fun.sc	Thu Nov 27 18:18:36 2025 +0000
+++ b/progs/fun/fun.sc	Thu Dec 04 21:33:25 2025 +0000
@@ -1,3 +1,13 @@
+def even(n: Int) : Boolean = {
+  if (n == 0) true else odd(n - 1) 
+}
+def odd(n: Int) : Boolean = {
+  if (n == 0) false else even(n - 1) 
+}
+
+
+
+
 // A Small Compiler for a Simple Functional Language
 // (includes a parser and lexer)
 //
@@ -16,9 +26,7 @@
 //    amm fun.sc run fact.fun   
 //
 // the first prints out the JVM instructions for two
-// factorial functions
-//
-// the next compile/run fun files
+// factorial functions; the next compiles/runs fun files
 //
 
 import $file.fun_tokens, fun_tokens._

Binary file slides/basic-code.jpg has changed

Binary file slides/machine-code-large.png has changed

Binary file slides/machine-code.jpg has changed

Binary file slides/slides08.pdf has changed

--- a/slides/slides08.tex	Thu Nov 27 18:18:36 2025 +0000
+++ b/slides/slides08.tex	Thu Dec 04 21:33:25 2025 +0000
@@ -158,37 +158,6 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[t,fragile]
-
-\small
-\begin{textblock}{13}(-0.5,1)
-\begin{lstlisting}[numbers=none]
-def mkeps(r: Rexp) : Val = r match {
-  ...
-  case PLUS(r) => Stars(List(mkeps(r))) 
-  case OPTIONAL(r) => Stars(Nil)
-  case NTIMES(r, n) => Stars(List.fill(n)(mkeps(r)))
-}
-
-def inj(r: Rexp, c: Char, v: Val) : Val = (r, v) match {
-  ...
-  case (RANGE(_), Empty) => Chr(c)
-  case (PLUS(r), Sequ(v1, Stars(vs))) => Stars(inj(r, c, v1)::vs)
-  case (OPTIONAL(r), v) => Stars(inj(r, c, v)::Nil)
-  case (NTIMES(r, n), Sequ(v1, Stars(vs))) => Stars(inj(r, c, v1)::vs)
-}
-\end{lstlisting}
-\end{textblock}
-
-
-\begin{textblock}{5}(3,13.5)
-\bl{$r^? \dn r^{\{0..1\}}$}
-\end{textblock}
-
-\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
-
 
 
 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Binary file slides/slides09.pdf has changed

--- a/slides/slides09.tex	Thu Nov 27 18:18:36 2025 +0000
+++ b/slides/slides09.tex	Thu Dec 04 21:33:25 2025 +0000
@@ -46,10 +46,10 @@
   \begin{center}
   \begin{tabular}{ll}
     Email:  & christian.urban at kcl.ac.uk\\
-Office Hour: & Fridays 12 -- 14\\  
+Office Hour: & Fridays 11:30 -- 12:30\\  
   Location: & N7.07 (North Wing, Bush House)\\
   Slides \& Progs: & KEATS\\
-  Pollev: & \texttt{\alert{https://pollev.com/cfltutoratki576}}\\  
+  %%Pollev: & \texttt{\alert{https://pollev.com/cfltutoratki576}}\\  
   \end{tabular}
   \end{center}