[Ribes]

HI!
I wrote this code to define a different diffusivity for the air in the porous media and not porous media:
#include "udf.h"
DEFINE_DIFFUSIVITY(diffusion_coefficient,c,t,i)
if (C_POR(c,t)==1)
Diff=2.31*e5*101325/C_P(c,t)*pow(C_T(c,t)/273.15,1.81)
else
Diff=2.31*e5*101325/C_P(c,t)*pow(C_T(c,t)/273.15,1.81)*pow(C_POR(c,t),2.24)
return Diff

when I compile it gives parse error on line 3....is it because of the C_POR macro? I founded this notation in the forums..thanks for any help