Example: ilomipex2.cpp

This example derives from ilolpex2.cpp, an LP explained in the manual Getting Started with ILOG CPLEX. That LP example differs from this MIP example in these ways:

This example solves only MIPs, so it calls only IloCplex::solve(), and its command line does not require the user to indicate an optimizer.
This example doesn't generate or print a basis.

Like other applications based on the ILOG CPLEX Concert Technology Library, this one uses IloEnv env to initialize the Concert Technology environment and IloModel model(env) to create a problem object. Before it ends, it calls env.end to free the environment.

#include <ilcplex/ilocplex.h>
ILOSTLBEGIN

static void usage (const char *progname);

int
main (int argc, char **argv)
{
   IloEnv env;
   try {
      IloModel model(env);
      IloCplex cplex(env);

      if ( argc != 2 ) {
         usage (argv[0]);
         throw(-1);
      }

      IloObjective   obj;
      IloNumVarArray var(env);
      IloRangeArray  rng(env);
      cplex.importModel(model, argv[1], obj, var, rng);

      cplex.extract(model);
      cplex.solve();

      env.out() << "Solution status = " << cplex.getStatus() << endl;
      env.out() << "Solution value  = " << cplex.getObjValue() << endl;

      IloNumArray vals(env);
      cplex.getValues(vals, var);
      env.out() << "Values        = " << vals << endl;
   }
   catch (IloException& e) {
      cerr << "Concert exception caught: " << e << endl;
   }
   catch (...) {
      cerr << "Unknown exception caught" << endl;
   }

   env.end();
   return 0;
}  // END main


static void usage (const char *progname)
{
   cerr << "Usage: " << progname << " filename" << endl;
   cerr << "   where filename is a file with extension " << endl;
   cerr << "      MPS, SAV, or LP (lower case is allowed)" << endl;
   cerr << " Exiting..." << endl;
} // END usage