mip1_c++.cpp
/* Copyright 2016, Gurobi Optimization, Inc. */
/* This example formulates and solves the following simple MIP model:
maximize x + y + 2 z
subject to x + 2 y + 3 z <= 4
x + y >= 1
x, y, z binary
*/
#include "gurobi_c++.h"
using namespace std;
int
main(int argc,
char *argv[])
{
try {
GRBEnv env = GRBEnv();
GRBModel model = GRBModel(env);
// Create variables
GRBVar x = model.addVar(0.0, 1.0, 0.0, GRB_BINARY, "x");
GRBVar y = model.addVar(0.0, 1.0, 0.0, GRB_BINARY, "y");
GRBVar z = model.addVar(0.0, 1.0, 0.0, GRB_BINARY, "z");
// Set objective: maximize x + y + 2 z
model.setObjective(x + y + 2 * z, GRB_MAXIMIZE);
// Add constraint: x + 2 y + 3 z <= 4
model.addConstr(x + 2 * y + 3 * z <= 4, "c0");
// Add constraint: x + y >= 1
model.addConstr(x + y >= 1, "c1");
// Optimize model
model.optimize();
cout << x.get(GRB_StringAttr_VarName) << " "
<< x.get(GRB_DoubleAttr_X) << endl;
cout << y.get(GRB_StringAttr_VarName) << " "
<< y.get(GRB_DoubleAttr_X) << endl;
cout << z.get(GRB_StringAttr_VarName) << " "
<< z.get(GRB_DoubleAttr_X) << endl;
cout << "Obj: " << model.get(GRB_DoubleAttr_ObjVal) << endl;
} catch(GRBException e) {
cout << "Error code = " << e.getErrorCode() << endl;
cout << e.getMessage() << endl;
} catch(...) {
cout << "Exception during optimization" << endl;
}
return 0;
}
