make LaTeX draw a \hline between each line in tabular without using \hline? [closed]

Answer 1

\catcode`@=11
\let \savecr \@tabularcr
\def\@tabularcr{\savecr\hline}
\catcode`@=12

\begin{tabular}{ccc}
1 & 2 & 3\\ 
4 & 5 & 6\\
\end{tabular}