--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/slides/slides03.tex	Wed Nov 23 13:32:01 2016 +0000
@@ -0,0 +1,141 @@
+\documentclass[dvipsnames,14pt,t,xelatex]{beamer}
+\usepackage{../slides}
+\usepackage{../graphics}
+\usepackage{../langs}
+%\usepackage{../data}
+
+\hfuzz=220pt 
+
+%\setmonofont[Scale=.88]{Consolas}
+%\newfontfamily{\consolas}{Consolas}
+
+\lstset{language=Scala,
+        style=mystyle,
+        numbersep=0pt,
+        numbers=none,
+        xleftmargin=0mm}
+
+\newcommand{\bl}[1]{\textcolor{blue}{#1}}     
+
+% beamer stuff 
+\renewcommand{\slidecaption}{PEP (Scala) 02, King's College London}
+
+
+\begin{document}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[t]
+\frametitle{%
+  \begin{tabular}{@ {}c@ {}}
+  \\[5mm]
+  \huge PEP Scala (2) 
+  \end{tabular}}
+
+  \normalsize
+  \begin{center}
+  \begin{tabular}{ll}
+  Email:  & christian.urban at kcl.ac.uk\\
+  Office: & S1.27 (1st floor Strand Building)\\
+  Slides \& Code: & KEATS
+  \end{tabular}
+  \end{center}
+
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
+
+\begin{frame}[t]
+\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
+
+
+\begin{itemize}
+\item \large {\bf You can avoid \textcolor{blue}{\texttt{null}}}:
+\end{itemize}
+
+
+\begin{textblock}{6}(1,5)
+  \begin{bubble}[10.5cm]\small
+      ``I call it my billion-dollar mistake. It was the invention of
+      the null reference in 1965. At that time, I was designing the
+      first comprehensive type system for references in an object
+      oriented language (ALGOL W). My goal was to ensure that all use
+      of references should be absolutely safe, with checking performed
+      automatically by the compiler. But I couldn't resist the
+      temptation to put in a null reference, simply because it was so
+      easy to implement. This has led to innumerable errors,
+      vulnerabilities, and system crashes, which have probably caused
+      a billion dollars of pain and damage in the last forty years.''
+      \hfill Sir Tony (Hoare)
+\end{bubble}
+\end{textblock}
+  
+\begin{textblock}{5}(11.8,1)
+\includegraphics[scale=0.20]{hoare.jpg}\\
+\end{textblock}
+  
+\end{frame}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{\huge\textbf{\texttt{return}}}
+
+\begin{center}\LARGE
+you should never use it
+\end{center}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Types}
+
+\begin{itemize}
+\item Base types\smallskip
+
+  \begin{tabular}{@{}l@{}}
+    \textcolor{codegreen}{\texttt{Int}},
+    \textcolor{codegreen}{\texttt{Long}},
+    \textcolor{codegreen}{\texttt{BigInt}},
+    \textcolor{codegreen}{\texttt{Float}},
+    \textcolor{codegreen}{\texttt{Double}}\\
+    \textcolor{codegreen}{\texttt{String}},
+    \textcolor{codegreen}{\texttt{Char}}\\
+    \textcolor{codegreen}{\texttt{Boolean}}
+  \end{tabular}
+
+\item Compound types \smallskip   
+
+  \begin{tabular}{@{}ll@{}}
+    \textcolor{codegreen}{\texttt{List[Int]}}     & lists of Int's \\
+    \textcolor{codegreen}{\texttt{Set[Double]}}   & sets of Double's \\
+    \textcolor{codegreen}{\texttt{(Int, String)}} & Int-String pair\\
+    \textcolor{codegreen}{\texttt{List[(BigInt, String)]}} &
+                                      lists of BigInt-String\\
+                                      & pairs\\
+    \textcolor{codegreen}{\texttt{List[List[Int]]}} & list of lists of Int's\\                                  
+  \end{tabular}
+
+\end{itemize}  
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{\begin{tabular}{c}\\[3cm]\alert{Questions?}\end{tabular}}
+
+\mbox{}
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+\end{document}
+
+
+\end{document}
+
+%%% Local Variables:  
+%%% mode: latex
+%%% TeX-master: t
+%%% End: 
+