General ⇒ \setboolean in \if statement

[ziggo1879]

Hey Guys,

I try to set a boolean in a if-statement but Latex seems to ignore my input.

Code: Select all

\documentclass[a4paper,11pt]{article}

\usepackage{ifthen}

%booleandeclaration
\newboolean{istest}
\setboolean{istest}{false}

%Set boolean in if
\newcommand{\activate}[1]{
\ifnum#1>0{\setboolean{istest}{true}}\fi }

%test boolean of true or false
\newcommand{\test}{\ifthenelse{\boolean{istest}}{TRUE}{FALSE}}%

\activate{17}
\begin{document}
\test
\end{document}

I thought the \activate{17} statement would set the boolean "istest" to true, but it dosen't, \test returns FALSE.

Any idea why the \setboolean statement not works correctly in the \ifnum statement?

Ziggo

[sommerfee]

\newcommand{\activate}[1]{
\ifnum#1>0{\setboolean{istest}{true}}\fi }

This keeps the effect of \setboolean local to the group (opened right before \setboolean with { ), but since you close the group right after \setboolean this code has actually no effect.

So change it to

Code: Select all

\newcommand{\activate}[1]{%
  \ifnum#1>0 \setboolean{istest}{true}\fi}

and it should work as expected.

[ziggo1879]

and it should work as expected.

Now it works fine :-).