Does the cr/lf count as non alphabetic character e.g if we
have this :
" \p
ar"
\endinput
what should we print .Also are the rules kept for the
\endinput - Is there really an non alphabetic char after or
just end of file?

> Does the cr/lf count as non alphabetic character e.g if
we
> have this :
> " \p
> ar"
> \endinput
> what should we print .

here \p - is the command sequence, and ar = are just letters
so you cannot treat this as the \par command

>Also are the rules kept for the
> \endinput - Is there really an non alphabetic char after
or
> just end of file?
\endinput - is the end of YOUR input anything that follows
should be ignored