[OS X TeX] Conditional Typesetting Inside Lists

[Themis Matsoukas]

On Feb 26, 2008, at 10:41 AM, Maurino Bautista wrote:

>  I would like to define a variable whose values are either exam or  
> key.
> [...]
>

I use the \commentsoff{},  \commentson{} commands that are built-in in  
the memoir class (see p. 207 of the memoir manual, meman.pdf). I  
believe that these commands are also available through packages, if  
you don't want to use memoir. Here is a minimal example. Set the  
boolean ShowKey to true or false to show/hide the solution.

Themis

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\documentclass[11pt,article]{memoir}
\usepackage{ifthen}
\begin{document}
\newcomment{MyKey}

%-----setup boolean ShowKey----
\newboolean{ShowKey}
\setboolean{ShowKey}{true}   %<-- true: shows key; false: hides key
\ifthenelse{\boolean{ShowKey}}
{\commentsoff{MyKey}}
{\commentson{MyKey}}

%----E X A M P L E-----
% problem statement here
\textbf{Problem:} $1+1=?$

% solution here - printed only if ShowKey is true
\begin{MyKey}
\textbf{Solution:} $1+1=2$
\end{MyKey}

\end{document}