Center hrule in the middle of the page

Question

I would like to center a horizontal line on my page and I would like the width of this line to be half \textwidth. Here is what I tried but it doesn't work :

\documentclass[10pt,a4paper]{article}
\begin{document}

Hello everyone ! 

\begin{center}
\hrule width 0.5\textwidth
\end{center}

\end{document}

Thank you for your help !

Answer 1

You can replace

\hrule width 0.5\textwidth

with

\rule{0.5\textwidth}{.4pt}

Also, if you don't need the center environment for anything else, you can replace

\begin{center}
\rule{0.5\textwidth}{.4pt}
\end{center}

with simply

\noindent\hfil\rule{0.5\textwidth}{.4pt}\hfil

MWE

\documentclass[10pt,a4paper]{article}
\begin{document}

Hello everyone !

\begin{center}
\rule{0.5\textwidth}{.4pt}
\end{center}

\noindent\hfil\rule{0.5\textwidth}{.4pt}\hfil

\end{document} 

Output

Answer 2

I tried using \rule in the accepted answer, but I ended up going with \hrule like the original question asked too:

\newcommand{\SectionBreak}{%
    %\vskip 0.5ex

    \nointerlineskip
    \moveright 0.125\textwidth \vbox{\hrule width0.75\textwidth}
    \nointerlineskip
    %\vskip 0.5ex
    \makeatletter
        %\@afterindenfalse%
    \makeatother

}