[NTG-context] ! Extra \else error

Bart C. Wise bntgcontext at wiseguysweb.com
Thu Dec 11 16:05:38 CET 2008


On Thursday 11 December 2008 07:29:15 am Zhichu Chen wrote:
> Hi Bart,
>
> On Thu, Dec 11, 2008 at 10:21 PM, Bart C. Wise
>
> <bntgcontext at wiseguysweb.com> wrote:
> > If I change the loop to be the following, I still get the same error:
> >
> > \def\myloop#1{%
> >  \tempcnta=\the\startcnt%
> >  \loop
> >    \advance \tempcnta by 1
> >    \if\tempcnta=#1\else \repeat\fi
> > }
> >
> > Bart
>
> No, you should define like:
>
> \def\myloop#1{%
>  \tempcnta=\the\startcnt%
>  \loop
>    \advance \tempcnta by 1
>    \if\tempcnta<#1\repeat
> }
>
> No \else before \repeat in this case and no \fi outside the loop.
>
> Taking a look at the definition, you could find the following
> code (something like that, I can't remember clearly):
>
> \def\loop#1\repeat{\def\body{#1}\iterate}
> \def\iterate{something to do with \body}
>
> You can see there should not be an extra \else in the \body, and
> you don't need the \fi to enclose it.
>
> I don't know whether I've made my point clear.

Chen,

Thanks.  That makes sense now.  However, when I take your code and run it, it 
only goes through 1 iteration of the loop and exits.  I'm puzzled.

Bart


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