# SCIP

Solving Constraint Integer Programs

In some cases, it is necessary to keep track of changes in a parameter. If this is the case, the user can define a method by the PARAMCHGD callback and use this method as the paramchgd parameter of the SCIPaddXyzParam() method, also giving a pointer to the data, which is needed in this method, as paramdata. If this method is not NULL, it is called every time the value of the parameter is changed.