[pstricks] including PostScript code in pstricks

[Germi Camps]

I have to draw a serie of arcs, but first I have to calculate the center 
point, the radius and the beginning and ending angle depending on a 
parameter
I do not have any problem when calculating the center, because it is 
delimited by ( ). but for the other arguments, delimited by { }, 
pstricks doesn't accepts PostScript code... how can I do it?

\def\rad{3}
\def\radb{5}

\psarc(!\rad\space 1 \rad\space add div 10 mul 0){! \radb\space 2 div 1 
add}{0}{360}

! \radb\space 2 div 1 add -->> this doesn't work inside { }

thanks

-- 
Germinal Camps Barjau
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www.gratisweb.com/germicamps