# Tabular with horizontal and vertical double line, avoid ugly corner

I am using tabular to make simple table, I want to have double line on the sides. The problem is that the double-lines do not meet elegantly at the bottom-right corner:

How can I make the double lines meet in a better what (e.g. forming an double ell shape)?

Other environments and packages are welcomed but tabular is preferred.

Minimal code:

\documentclass[]{article}
\usepackage{array}
\begin{document}
\begin{tabular}{c|c||}
1 & 2 \\
3 & 4 \\
\hline\hline
\end{tabular}
\end{document}

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Vertical rules in tabular material are always ugly and distracting. Have a look at booktabs. This package gives you some useful macros and some hints on nice looking tables. –  Johannes_B Dec 18 '13 at 9:21

As mentioned in the comment by Johannes, vertical rules should be avoided. You should use the package booktabs to create nice tables.

However David Carlisle created the package hhline which supports such requests.

\documentclass[]{article}
\usepackage{array,hhline}
\begin{document}
\begin{tabular}{c|c||}
1 & 2 \\
3 & 4 \\
\hhline{=:=:b|}
\end{tabular}
\end{document}


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Thanks! :) :P :/ . Do you know why the lines are rendered with some irregularities (as if they were superimposed)? –  alfC Dec 18 '13 at 9:56
@alfC: Normally this is related to your viewer. Heiko Oberdiek explained this issue related to another package: tex.stackexchange.com/questions/124539/… –  Marco Daniel Dec 18 '13 at 9:58