I have a diagram that I want to include in my latex document.
However, the diagram is not rendered properly. I am using Texmaker 4.1.1 with MiKTeX 2.9 on a Windows 7 32-bit machine.

\documentclass[letterpaper, 10pt, conference]{ieeeconf}
\usepackage{times}
\usepackage{amsmath}
\usepackage{url}
\usepackage{cite}
\usepackage[dvips]{graphicx}
\usepackage{subfigure}
\usepackage{float}
\restylefloat{figure}
\usepackage{flafter}
\usepackage[section]{placeins}
\usepackage{pseudocode}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric, arrows}
\begin{document}
\tikzset{
box/.style = {draw, rectangle, minimum height = 2.5em, minimum width = 2.5em},
circl/.style = {draw, circle, minimum size = 8mm,label={[font=\small, inner sep=1pt]200:$+$}},
input/.style = {coordinate},
output/.style = {coordinate},
to/.style = {->,>=stealth', shorten >=1pt, semithick, font=\small}
}
\thispagestyle{empty}
\pagestyle{empty}
\section{How To Use}
\begin{figure}[H]
\centering
\begin{tikzpicture}[auto, node distance=2cm]
\node (in1) [input] {};
\node (cs) [box, right of=in1] {$C$};
\node (crc1) [circl, right of=cs]{};
\node (gs) [box, right of=crc1] {$G$};
\node (hs) [box, right of=gs] {$H$};
\node (ctl) [box, below of=hs] {Limiter};
\node (crc2) [circl, right of=hs]{};
\node (ze) [input, above of=crc2] {};
\node (ke) [box, right of=crc2] {$K$};
\node (fs) [output, right of=ke] {};
\draw [to] (in1) -- node {$f$}(cs);
\draw [to] (cs) -- (crc1);
\draw [to] (crc1) --(gs);
\draw [to] (gs) -- (hs);
\draw [to] (hs) -- node {$I_{max}$}(ctl);
\draw [to] (ctl) --node {$\theta$}(hs);
\draw [to] (hs) -- node {$z$}(crc2);
\draw [to] (ze) -- node {$C$}(crc2);
\draw [to] (crc2) --(ke);
\draw [to] (ke) -- node {$f(s)$}(fs);
\end{tikzpicture}
\caption{The above figure is control diagram}
\label{fig:force-control-scheme}
\end{figure}
\end{document}
10pt, not10 pt(also, that may be the default, so it could be omitted). Are you compiling with pdfLaTeX? – Werner Aug 27 '14 at 16:13pdflatexto compile. If this is the case, don't use optiondvipsfor thegraphicxpackage. Also,tikzloadsgraphicxon its own, so you don't need to load it yourself. – Paul Gessler Aug 27 '14 at 18:02\usepackage[dvips]{graphicx}but I am using\DeclareGraphicsExtensions{.eps}also. Please suggest a way. – ravi Aug 27 '14 at 19:04