LateX - If condition-CodePudding

I have some problem with the if condition in LateX. Is anyone can tell me why it never print "OK" ?

\def \scaleGraphX{0,20,30,40,50,60,70,80,100}

\foreach \x [count=\xi] in \scaleGraphX{
    \if \x = 0
        {OK} 
    \else 
        {PAS OK}
    \fi
}

Normally I should find at least 1 "OK"

CodePudding user response：

You can use \ifnum for numerical if tests:

\documentclass{article}

\usepackage{pgffor}

\begin{document}

\def\scaleGraphX{0,20,30,40,50,60,70,80,100}

\foreach \x [count=\xi] in \scaleGraphX{
    \ifnum\x=0
        {OK} 
    \else 
        {PAS OK}
    \fi
}



\end{document}