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Add documentation for UNCHANGED_ and ZERO_ #588

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Add documentation for UNCHANGED_ and ZERO_ #588

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8 changes: 8 additions & 0 deletions doc/manual/prepro.tex
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Expand Up @@ -108,6 +108,14 @@ \section{The preprocessor variables}
#endif
#enddo
\end{verbatim}
\item[UNCHANGED\_] Takes the value 1 if all active expressions were unchanged in the
previous module, and 0 otherwise. `UNCHANGED\_exprname' is 1 if the
expression ``exprname'' was unchanged in the previous module, and
0 otherwise.
\item[ZERO\_] Takes the value 1 if all active expressions were zero in the
previous module, and 0 otherwise. `ZERO\_exprname' is 1 if the
expression ``exprname'' was zero in the previous module, and
0 otherwise.
\end{description}

\noindent If \FORM\ cannot find a preprocessor variable, because it has
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