undeclared variable
 

hi.
I want to interpret a udf in fluent, but i encounter this error:
"line 12: P_CELL: undeclared variable"
here is part of my file:

#include "udf.h"
DEFINE_DPM_LAW(condenshumidlaw,p,coupled)
{
#define R 8314.34;
#define Mo2 31.999;
#define Mn2 28.013;
#define Mh2o 18.015;
#define Dim 3e-5;
#define noo_wv 0.64;
cell_t c;
c=P_CELL(p);
Thread *t;
t=P_CELL_THREAD(p);
real m_cel=C_R(c,t)*C_VOLUME(c,t);
real t_cel=C_T(c,t);


is there any one who can help me.
so thanks!

declare variable first, then use, its not VC++.
#include "udf.h"
#define R 8314.34;
#define Mo2 31.999;
#define Mn2 28.013;
#define Mh2o 18.015;
#define Dim 3e-5;
#define noo_wv 0.64;
DEFINE_DPM_LAW(condenshumidlaw,p,coupled)
{

cell_t c;
Thread *t;
real m_cel,t_cel;
c=P_CELL(p);
t=P_CELL_THREAD(p);
m_cel=C_R(c,t)*C_VOLUME(c,t);
t_cel=C_T(c,t);

Hi dear gear boy.
I changed my udf according to your suggestion.
but again i encountered this error:
"P_CELL: undeclared variable"

Many macros can be identified in interpreting mode. Maybe you should use compile mode, you should first install VC++

hi dear
did you find a solution? I have a same problem.

This macro can be accessed only by complied UDF.