How to let enumeration start at (0) automatically?

Question

As we know the enumeration usually begin at (1), then followed by (2), (3),...

My question: How to start at (0)? I know \item[(0)] will work, but how do I do this automatically? That is, make it as a default option.

Answer 1

I really don't know why one should want it. However, here's a solution with the enumitem package.

\documentclass{article}
\usepackage{enumitem}
\setlist[enumerate,1]{start=0} % only outer nesting level
\begin{document}
\begin{enumerate}
\item zero
\item one
  \begin{enumerate}
  \item a
  \item b
  \end{enumerate}
\item two
\end{enumerate}
\end{document}