CFD Online Discussion Forums - How to remove "invalid type conversion: double -> pointer to char" Error?

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How to remove "invalid type conversion: double -> pointer to char" Error?

I have written a UDF to define the Specific Heat of the PCM in the melting range by the following equation

Cp= (1934+(131*(temp-300.35))+(245000*((exp(-(temp-301.35)*temp))/(1.77245))));

The UDF is as follows

#include "udf.h"
DEFINE_SPECIFIC_HEAT(cp_pcm,c,t,temp,Tref, h, yi)
{
real cp;
real temp=C_T(c,t);
if (temp<=300.35)
cp=1934;
else if (temp>=302.35)
cp=2196;
else
cp=(1934+(131*(temp-300.35))+(245000*((exp(-(temp-301.35)*temp))/(1.77245))));
return cp;
}

When i interpret it, It shows the following Error in Line - 5.
"invalid type conversion: double -> pointer to char"

Please Suggest me something how to remove this Error????

Thanks.

where did you get macro DEFINE_SPECIFIC_HEAT(cp_pcm,c,t,temp,Tref, h, yi) ?

should be DEFINE_SPECIFIC_HEAT (name,T,Tref,h,yi)
and

Code:

#include "udf.h"

DEFINE_SPECIFIC_HEAT (name,temp,Tref,h,yi)

{

real cp;

if (temp <= 300.35)

cp=1934;

else if (temp >= 302.35)

cp=2196;

else 

cp=(1934+(131*(temp-300.35))+(245000*((exp(-(temp-301.35)*temp))/(1.77245))));

return cp;

}

best regards