595 \newcommand{\qq}{\mbox{\texttt{"}}}

   596 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   597 \mode<presentation>{

   598 \begin{frame}[c]

   599 \frametitle{\begin{tabular}{c}Grammars\end{tabular}}

   600 

   601 \begin{center}

   602 \bl{\begin{tabular}{lcl}

   603 $E$ & $\rightarrow$ &  $F + (F \cdot \qq*\qq \cdot F) + (F \cdot \qq\backslash\qq \cdot F)$\\

   604 $F$ & $\rightarrow$ & $T + (T \cdot \qq\texttt{+}\qq \cdot T) + (T \cdot \qq\texttt{-}\qq \cdot T)$\\

   605 $T$ & $\rightarrow$ & $num + (\qq\texttt{(}\qq \cdot E \cdot \qq\texttt{)}\qq)$\\

   606 \end{tabular}}

   607 \end{center}

   608 

   609 \bl{$E$}, \bl{$F$} and \bl{$T$} are non-terminals\\

   610 \bl{$E$} is start symbol\\

   611 \bl{$num$}, \bl{(}, \bl{)}, \bl{+} \ldots are terminals\bigskip\\

   612 

   613 

   614 \bl{\texttt{(2*3)+(3+4)}}

   615 

   616 \end{frame}}

   617 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   

   618 

   619 

   620 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   621 \mode<presentation>{

   622 \begin{frame}[c]

   623 

   624 \begin{center}

   625 \bl{\begin{tabular}{lcl}

   626 $E$ & $\rightarrow$ &  $F + (F \cdot \qq*\qq \cdot F) + (F \cdot \qq\backslash\qq \cdot F)$\\

   627 $F$ & $\rightarrow$ & $T + (T \cdot \qq\texttt{+}\qq \cdot T) + (T \cdot \qq\texttt{-}\qq \cdot T)$\\

   628 $T$ & $\rightarrow$ & $num + (\qq\texttt{(}\qq \cdot E \cdot \qq\texttt{)}\qq)$\\

   629 \end{tabular}}

   630 \end{center}

   631 

   632 \begin{center}

   633 \begin{tikzpicture}[level distance=8mm, blue]

   634   \node {E}

   635     child {node {F} 

   636      child {node {T} 

   637                  child {node {\qq(\qq\,E\,\qq)\qq}

   638                             child {node{F \qq*\qq{} F}

   639                                   child {node {T} child {node {2}}}

   640                                   child {node {T} child {node {3}}} 

   641                                }

   642                           }

   643               }

   644      child {node {\qq+\qq}}

   645      child {node {T}

   646        child {node {\qq(\qq\,E\,\qq)\qq} 

   647        child {node {F}

   648        child {node {T \qq+\qq{} T}

   649                     child {node {3}}

   650                     child {node {4}} 

   651                  }

   652                  }}

   653     }};

   654 \end{tikzpicture}

   655 \end{center}

   656 

   657 \begin{textblock}{5}(1, 5)

   658 \bl{\texttt{(2*3)+(3+4)}}

   659 \end{textblock}

   660 

   661 \end{frame}}

   662 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   

   663