Variables made parameters in Cactus

1. Remove the declaration of the variable

2. In the param.ccl from ~/Cactus/arrangements/CactusShrimp/Shrimp/ declare the variables you want to make as Cactus parameters

i.e.

PRIVATE:
( !!Access level)

INT endday "The last day of the simulation or the number of days"
(!!The parameter type and name)

{
1:365::"range for the endday"
(!! The range or the allowed values)

} 80
(!!default value)

3. In the parameter file specify the value of the variable (~/Cactus/exe/shrimp.par):

i.e. - add this line:
Shrimp::endday=12

4. In the main file ( inside the code) :

- include the following library:
#include "cctk_Parameters.h"

- in the subroutines where the variable is used, add:
DECLARE_CCTK_PARAMETERS
(that would be after the implicit none)