All,
I have a file that is filled with exercises that was written in a brand of
lamstex that I need to convert to latex. Exercises begin like this:
\ex If $f(x)=x^2$, blah ...
That is, I can count on each exercise beginning with the \ex macro.
Now there are at times instructions for groups of exercises. They look like
this:
\begin{instructions}
Blah, blah, blah, ...
\end{instructions}
As I begin reading in lines from the file, I just print them until I hit a
line that has an opening "\ex" in it. At that point I want to accumulate
lines in one long string until I hit either "\begin{instructions}" or
another "\ex".
$line.=<IN> #unless the current line coming in from IN is the start
#of a new \ex or a \begin{instructions}
The difficulty is now I've read one line too many. I'd like to "put this
last line back" for the next round of reading while I process the
accumulated exercise lines.
Is there a standard way of handling this difficulty?
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