I want to print out the value of \textwidth in the =? placeholder as follows
\newcommand*{\MARKER}% {\noindent\strut\vrule \hrulefill~half textwidth =? cm~\hrulefill\vrule \hrulefill~half textwidth =? cm~\hrulefill\vrule \marginpar{\strut\vrule\hrulefill~marginpar~\hrulefill\vrule}}
Please help me.
Thank you in advance.
regards,
Hayashi