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Chess - Composing constraints and solving

Description
A tiny LP problem concerning the manufacture of chess boards. The example composes constraints term by term and then solves the problem.

 xbchessjava.zip [download all files]

Source Files
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 xbchess.java [download]

xbchess.java

/********************************************************
Xpress-BCL Java Example Problems
================================

file xbchess.java

Small LP-problem.

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

import com.dashoptimization.*;

public class xbchess {
public static void main(String[] args) {
XPRBvar xs;                /* Number of small chess sets to make */
XPRBvar xl;                /* Number of large chess sets to make */

try (XPRBprob p = new XPRBprob("Chess")) { /* Initialize BCL and create a new problem */

/****VARIABLES****/
xs = p.newVar("xs");
xl = p.newVar("xl");

/****OBJECTIVE****/
p.setObj(xs.mul(5).add(xl.mul(20)));
/* Define & set the obj. function 5*xs + 20*xl */

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

/* Define the constraint xs + 3*xl <= 200 */
p.newCtr("wood", xs.add(xl.mul(3)).lEql(200) );

/****SOLVING****/
p.setSense(XPRB.MAXIM);
p.lpOptimize("");          /* Solve the LP-problem */
}
}
}

`