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Possible Problem

This, however, does not always work:

[ BinDigit ] BinDigit
$\begin{program} ~~~~~~~~{\vem void}~readOneOrTwoDigits()~\{ \\ ~~~~~~~~~~~~~~~~{... ...t$$\vert$~ch~$==$~'1')~nextCh();~{\vem else}~error(); \\ ~~~~~~~~\}\end{program}$
{ BinDigit } BinDigit
Number | Number "." Number

Q: Can you find equivalent expressions, that do not have the problem?

Christoph Zenger
3/23/2000