# Why my table does not have four-sided edges?

I need my table to have all edges.

\begin{tabular}{l|p{90mm}}
\hline
number & result \\
\hline
\hline
0 & only \\
\hline
\hline
1 & wrong
\\
\hline
\end{tabular}


How can I achieve that?

The | indicates where vertical lines should be placed, so if you not only want a line between your two columns, but also in front and afterwards, use {|l|p{90mm}|} instead of {l|p{90mm}}