Re: counter in ConTeXt

[Aditya Mahajan <adityam@umich.edu>]

On Thu, 14 Dec 2006, Michael wrote:

>
> How do I use counter in ConTeXt?
>
> Specifically, I use this to define '\startproblem\stopproblem'.
>
> \defineenumeration[problem][location=top,text=Problem,%
>        between=\blank,before=\blank,after=\page]
>
> I want to say \totalnumberofproblems, in the beginning of the exam, like
> \totalnumberofpages.  How do I do that?

You need to have a two pass mechanism for this. Save the number of 
problems in the tui/tuo file in the first run and read the 
corresponding values from the file in the second run. Here is a simple 
example

\defineenumeration[problem][location=top,text=Problem,%
          between=\blank,before=\blank]

\def\nofproblems{0}

\definetwopasslist  {problems}

\def\checkproblems
   {\gettwopassdata{problems}
   \iftwopassdatafound
     \xdef \nofproblems {\twopassdata}
   \fi
   \global\let\checkproblems\relax}

\starttext

\checkproblems

This paper has \nofproblems\ Problems.

\dorecurse{10}
{\startproblem test \stopproblem}

\savetwopassdata  {problems}  {\nofproblems} {\getnumber[problem]}

\stoptext



HTH,
Aditya