[Tex/LaTex] Change the bullet of each \item

beameritemize

Sorry, may be the title is not clear. In fact, I need to make a list of advantages and disadvantages and I want to note the advantages as + and disadvantages as -. How can I change the full circle of item to + or – sign?

 \documentclass[compress,red]{beamer}
 \usepackage{etex}
 \mode<presentation>
 \usetheme{Warsaw}
   \usepackage[applemac]{inputenc}%les accents pour mac
   \usepackage{subfigure}
  \usepackage{amsmath}
  \usepackage{epsfig} 
     \usepackage{graphicx}
   \usepackage[all,knot]{xy}
    \xyoption{arc}
   \usepackage{setspace}
     \begin{document}
      \section{section1 }
     \frame[shrink]{\frametitle{Titre de la fenetre}
     \begin{itemize}

         \item point1
        \item point2
       \item point3
        \item point4
        \item point5
       \end{itemize}

        }

Best Answer

Just an addition to @Sigur's answer. You can define macros, say \pro and \con,

\newcommand\pro{\item[$+$]}
\newcommand\con{\item[$-$]}

to save some repetitive typing, and make the source code more readable.

MWE

\documentclass{beamer}
\usetheme{Warsaw}
\begin{document}

\newcommand\pro{\item[$+$]}
\newcommand\con{\item[$-$]}

\frame{
    \begin{itemize}
        \pro advantage
        \con disadvantage
        \item neutral
    \end{itemize}
}

\end{document}

Output

enter image description here