Ulrike Fischer wrote:
It is a very bad idea to make numbers active and to define them in
this way.
By way of demonstration that one can make digits active yet
still have access to the functionality that François needs,
I append the following :
** Phil.
--------
\documentclass {minimal}
\usepackage {longtable}
\usepackage {fontspec}
\setmainfont {Linux Libertine O}
\def \makedigitsactive
{
\makedigitactive 0
\makedigitactive 1
\makedigitactive 3
\makedigitactive 4
\makedigitactive 5
\makedigitactive 6
\makedigitactive 7
\makedigitactive 8
\makedigitactive 9
}
\def \makedigitactive #1%
{
\catcode `#1 = \active
\uccode `\~ = `#1
\uppercase {\def ~}{\ifmmode \string #1\else $#1$\fi}
}
\begin {document}
\begin {longtable}{ccccc}
\hline %
\multicolumn {2}{|c||}{1\textsuperscript {st} step} &
\multicolumn {1}{c}{} & \multicolumn {2}{||c|}{2\textsuperscript {nd}
step}\\\hline \hline
\rule {0pt}{15pt}1 & & 1 & $1\times 35 + 5 =$ & 40\\
7 & $7\times 5 + 0 =$ & 35 & & 35\\
5 & & 5 & & \\
0 & & & &
\end {longtable}
\def \zero {0}
\def \one {1}
\def \five {5}
\makedigitsactive
\begin {longtable}{ccccc}
\hline %
\multicolumn {2}{|c||}{1\textsuperscript {st} step} &
\multicolumn {\one}{c}{} & \multicolumn {2}{||c|}{2\textsuperscript {nd}
step}\\\hline \hline
\rule {\zero pt}{\one \five pt}1 & & 1 & $1\times 35 + 5 =$ & 40\\
7 & $7\times 5 + 0 =$ & 35 & & 35\\
5 & & 5 & & \\
0 & & & &
\end {longtable}
\end {document}
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