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\frametitle{\texttt {while} loop}
\begin{columns}
\column{0.45\textwidth}
\texttt{{\bf while} \emph{condition}:}
\texttt{\qquad instruction1}
\texttt{\qquad instruction2}
\texttt{\qquad \dots}
\column{0.55\textwidth}
\begin{tikzpicture}
\tikzstyle{s} = [rectangle, rounded corners, text centered,
draw=black, fill=red!30]
\tikzstyle{p} = [rectangle, text centered, draw=black, fill=orange!30]
\tikzstyle{d} = [rectangle, text centered, draw=black, fill=green!30]
\node(start) [s] {Start};
\node(cond) [d, below of=start] {\texttt{\emph{condition}}?};
\node(inst1) [p, right of=cond, xshift=2.7cm] {\texttt{instruction1}};
\node(inst2) [p, below of=inst1] {\texttt{instruction2}};
\node(dots) [p, below of=inst2] {\texttt{\dots}};
\node(end) [s, below of=other, yshift=-0.5cm] {End};
\draw[->] (start) -- (cond);
\draw[->] (cond) -- node[anchor=south] {\texttt{True}} (inst1);
\draw[->] (inst1) -- (inst2);
\draw[->] (inst2) -- (dots);
\draw[->] (cond) -- node[anchor=east] {\texttt{False}} (end);
\draw[->] (dots) -| ($(cond.south)+(0.4,0)$);
\end{tikzpicture}
\end{columns}
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