# Multiplying command argument by factor

I am trying to use calc to perform a basic multiplication of arguments of a user-defined command, like this:

\def\Verdana#1{
\normalfont
\fontsize{#1}{#1 * \real{1.2}}
\VerdanaFont
\selectfont}


But it is not working properly. Not sure if the length is being rounded to integer, of if the calc multiplication just can't operate on command parameters.

EDIT 1: I tried to change 1.2 to 12, but the output is the same. Thus, not really a rounding issue. Looks more like calc not liking to multiply parameter values.

EDIT 2: Temporary solution:

 \def\Palatino#1{
\newlength{\tmpLength}
\setlength{\tmpLength}{#1 * \real{1.2}}
\normalfont\fontsize{#1}{\tmpLength}\PalatinoFont\selectfont}


Keeping no answer, in case someone can explain why the length is needed.

• Please provide a full MWE. What I hacked together, I can't see the problem you are having. So, obviously, my MWE doesn't look like yours. – Steven B. Segletes Aug 30 '17 at 14:12

It's not really clear what you want to achieve, but you can do

\documentclass{article}
\usepackage{fontspec,xfp}
\usepackage{lipsum}

\newfontfamily{\PalatinoFont}{TeX Gyre Pagella}

\newcommand{\Palatino}[1]{%
\normalfont
\fontsize{#1}{\fpeval{1.2*(#1)}}%
\PalatinoFont
}

\begin{document}

\Palatino{15}\lipsum[2]

\Palatino{5}\lipsum[3]

\end{document}