Chess - Composing constraints and solving

/********************************************************
  Xpress-BCL C++ Example Problems
  ===============================

  file xbchess.cxx
  ````````````````
  Small LP-problem.

  (c) 2008 Fair Isaac Corporation
      author: S.Heipcke, Jan. 2000, rev. Mar. 2011
********************************************************/

#include <iostream>
#include "xprb_cpp.h"

using namespace std;
using namespace ::dashoptimization;

/***********************************************************************/

int main(int argc, char **argv)
{
 XPRBvar xs;               /* Number of small chess sets to make */
 XPRBvar xl;               /* Number of large chess sets to make */
 XPRBprob p("Chess");      /* Initialize a new problem in BCL */

/****VARIABLES****/
 xs = p.newVar("xs");
 xl = p.newVar("xl");
 
/****OBJECTIVE****/
 p.setObj(p.newCtr("OBJ", 5*xs + 20*xl)); /* Define & set the obj. function */ 

/****CONSTRAINTS****/
                           /* Define the constraint 3*xs + 2*xl <= 400 */
 p.newCtr("mc_time", 3*xs + 2*xl <= 400);

                           /* Define the constraint xs + 3*xl <= 200 */
 p.newCtr("wood", xs + 3*xl <= 200);
  
/****SOLVING****/
 p.lpOptimize("");         /* Solve the LP-problem */

 return 0;
}