Change the bullet of each \item

Question

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}

        }

Answer 1

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

Answer 2

As Sigur commented, you can use the optional argument to \item to specify the bullet:

\item[+] Some positive point
\item[$-$] Some negative point %use $-$ instead of - for a real minus sign.
\item Some neutral point

In my opinion the minus sign isn't great for this (not very clear), but you can use almost anything for your bullet, including colour commands (e.g. \item[\textcolor{red}{-}]). The comprehensive LaTeX symbols list may help you to find something good, such as \oplus and \ominus (circled versions, normally used as binary operators) from the mathabx package.

EDIT: code updated thanks to comment from Przemysław Scherwentke, but I can't easily updated the image from here.

Answer 3

You can use

\usepackage{paralist}

with

\begin{compactitem}[-]
\item
\end{compactitem}

and any optional argument at [] to to specify the bullet.

\begin{enumerate}[(i)][8] or \begin{compactitem}[$\circ$] or

have a look at paralist

Additional pro: save space with compactitem