# C++ Parameter Examples

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### C++ Parameter Examples

In the C++ interface, parameters are grouped by datatype into three enums: GRB_DoubleParam, GRB_IntParam, and GRB_StringParam. You refer to a specific parameter by appending the parameter name to the enum name. For example, the Threads parameter is GRB_IntParam_Threads.

To modify a parameter, you use GRBModel::set. Recall that you can also set parameters on an environment, but changes to the environment won't affect models that have already been created using that environment. It is generally simpler to set parameters on the model itself.

To set the TimeLimit parameter for a model, you'd do:

  GRBModel *m = ...;
m->set(GRB_DoubleParam_TimeLimit, 100.0);


You can also set the value of a parameter using strings for the parameter name and desired value. For example:

  GRBModel *m = ...;
m->set("TimeLimit", "100.0");


Use GRBModel::get to query the current value of a parameter:

  currentlimit = m.get(GRB_DoubleParam_TimeLimit);