\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{shapes.geometric,arrows}
\usepackage{pgfplots}

\title{TikZ Examples}
\date{}

\begin{document}
\maketitle
\begin{center}
\begin{tikzpicture}
\tikzstyle{process}=[draw,rectangle, rounded corners, fill=yellow!20, minimum width=3cm, minimum height=1cm]
\tikzstyle{decision}=[draw, diamond, fill=red!20, minimum width=4cm, aspect=2]
\tikzstyle{a}=[thick,->,>=stealth]

\node[process] (waking) at (0,0) {Wake up};

\node[decision] (day) at (0,-3) {Is it a weekday?};

\node[process] (up) at (0,-6) {Get out of bed};
\node[process] (sleep) at (5,-3) {Go back to sleep};

\draw[a] (waking) -- (day);
\draw[a] (day) -- node[anchor=east] {Yes} (up);
\draw[a] (day) --node[anchor=south] {No}  (sleep);
\draw[a] (sleep) |- (waking);

\end{tikzpicture}
\end{center}

\medskip

\begin{minipage}[c]{0.5\textwidth}
\begin{center}
\begin{tikzpicture}[scale=0.75]
    \begin{axis}[
        xlabel=$x$,
    	ylabel=$y$
        ]
        \addplot {x^2};
    \end{axis}
\end{tikzpicture}
\end{center}
\end{minipage}
\begin{minipage}[c]{0.5\textwidth}
\begin{center}
\begin{tikzpicture}[scale=0.75]
\pgfplotstableread[row sep=\\,col sep=&]{
    Person & Cats & Dogs \\
    Mira & 10 & 7 \\
    Jasleen & 5 & 0 \\
    Nick & 3 & 2 \\
    }\mydata
    \begin{axis}[
            ybar,
            symbolic x coords={Mira, Jasleen, Nick},
            xtick=data,
            %bar width = 1 cm,
            x = 1.5 cm,
            enlarge x limits=0.5,
            ymin = 0,
        ]
        \addplot table[x=Person,y=Cats]{\mydata};
        \addplot table[x=Person,y=Dogs]{\mydata};
        \legend{Cats,Dogs}
    \end{axis}



  \end{tikzpicture}
\end{center}
\end{minipage}
\newpage

\begin{verbatim}
\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{shapes.geometric,arrows}
\usepackage{pgfplots}

\title{TikZ Examples}
\date{}

\begin{document}
\maketitle
\begin{center}
\begin{tikzpicture}
\tikzstyle{process}=[draw,rectangle, rounded corners, fill=yellow!20,
	minimum width=3cm, minimum height=1cm]
\tikzstyle{decision}=[draw, diamond, fill=red!20, minimum width=4cm, aspect=2]
\tikzstyle{a}=[thick,->,>=stealth]

\node[process] (waking) at (0,0) {Wake up};

\node[decision] (day) at (0,-3) {Is it a weekday?};

\node[process] (up) at (0,-6) {Get out of bed};
\node[process] (sleep) at (5,-3) {Go back to sleep};

\draw[a] (waking) -- (day);
\draw[a] (day) -- node[anchor=east] {Yes} (up);
\draw[a] (day) --node[anchor=south] {No}  (sleep);
\draw[a] (sleep) |- (waking);

\end{tikzpicture}
\end{center}

\begin{center}
\begin{tikzpicture}
    \begin{axis}[
        xlabel=$x$,
    	ylabel=$y$
        ]
        \addplot {x^2};
    \end{axis}
\end{tikzpicture}
\end{center}

\begin{center}
\begin{tikzpicture}[font=\small,scale=0.75]
\pgfplotstableread[row sep=\\,col sep=&]{
    Person & Cats & Dogs \\
    Mira & 10 & 7 \\
    Jasleen & 5 & 0 \\
    Nick & 3 & 2 \\
    }\mydata
    \begin{axis}[
            ybar,
            symbolic x coords={Mira, Jasleen, Nick},
            xtick=data,
            bar width = 1 cm,
            x = 1.5 cm,
            enlarge x limits=0.5,
        ]
        \addplot table[x=Person,y=Cats]{\mydata};
    \end{axis}



  \end{tikzpicture}
\end{center}

\begin{center}
\begin{tikzpicture}[scale=0.75]
\pgfplotstableread[row sep=\\,col sep=&]{
    Person & Cats & Dogs \\
    Mira & 10 & 7 \\
    Jasleen & 5 & 0 \\
    Nick & 3 & 2 \\
    }\mydata
    \begin{axis}[
            ybar,
            symbolic x coords={Mira, Jasleen, Nick},
            xtick=data,
            %bar width = 1 cm,
            x = 1.5 cm,
            enlarge x limits=0.5,
            ymin = 0,
        ]
        \addplot table[x=Person,y=Cats]{\mydata};
        \addplot table[x=Person,y=Dogs]{\mydata};
        \legend{Cats,Dogs}
    \end{axis}
  \end{tikzpicture}
\end{center}
\end{document}
\end{verbatim}
\end{document}