/* nag_ip_mps_read (h02buc) Example Program.
 *
 * Copyright 1998 Numerical Algorithms Group.
 *
 * Mark 5, 1998.
 *
 * Mark 6 revised, 2000.
 * Mark 8 revised, 2004.
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <nage04.h>
#include <nagh02.h>

static int ex1(void);
static int ex2(void);

int main(void)
{
  Integer exit_status_ex1=0;
  Integer exit_status_ex2=0;

  Vprintf("nag_ip_mps_read (h02buc) Example Program Results.\n");
  exit_status_ex1 = ex1();
  exit_status_ex2 = ex2();

  return exit_status_ex1 == 0 && exit_status_ex2 == 0 ? 0 : 1;
}

static int ex1(void)
{
  Nag_Boolean *intvar;
  Integer exit_status=0, m, n;
  NagError fail;
  double *a, *bl, *bu, *c, objf, *x;

  INIT_FAIL(fail);
  Vprintf("\nExample 1: default options used.\n");

  /* Read MPSX data */
  /* nag_ip_mps_read (h02buc).
   * Read MPSX data for IP, LP or QP problem from a file
   */
  nag_ip_mps_read(0, Nag_TRUE, &n, &m, &a, &bl, &bu, &intvar, &c, &x,
                  H02_DEFAULT, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_ip_mps_read (h02buc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Solve IP problem defined by data as an LP problem */
  /* nag_opt_lp (e04mfc).
   * Linear programming
   */
  nag_opt_lp(n, m, a, n, bl, bu, c, x, &objf, E04_DEFAULT, NAGCOMM_NULL, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_opt_lp (e04mfc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Free memory allocated by nag_ip_mps_read (h02buc) */
  /* nag_ip_mps_free (h02bvc).
   * Free memory allocated by nag_ip_mps_read (h02buc)
   */
  nag_ip_mps_free(&a, &bl, &bu, &intvar, &c, &x);
 END:
  return exit_status;
}

static int ex2(void)
{
  Nag_Boolean *intvar;
  Integer exit_status=0, m, n;
  NagError fail;
  Nag_H02_Opt options;
  double *a, *bl, *bu, *c, objf, *x;

  INIT_FAIL(fail);

  Vprintf("\nExample 2: use of options structure.\n");

  /* Initialise options structure and read option settings. */
  /* nag_ip_init (h02xxc).
   * Initialize option structure to null values
   */
  nag_ip_init(&options);
  /* nag_ip_read (h02xyc).
   * Read optional parameter values from a file
   */
  nag_ip_read("h02buc", "stdin", &options, (Nag_Boolean)Nag_TRUE, "stdout",
              &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_ip_read (h02xyc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Read MPSX data */
  /* nag_ip_mps_read (h02buc), see above. */
  nag_ip_mps_read(0, Nag_TRUE, &n, &m, &a, &bl, &bu, &intvar, &c, &x,
                  &options, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_ip_mps_read (h02buc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Solve IP problem defined by data */
  options.list = Nag_TRUE;
  /* nag_ip_bb (h02bbc).
   * Solves integer programming problems using a branch and
   * bound method
   */
  nag_ip_bb(n, m, a, n, bl, bu, intvar, c, (double*)0, 0, NULLFN,
            x, &objf, &options, NAGCOMM_NULL, &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_ip_bb (h02bbc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }

  /* Free memory allocated by nag_ip_mps_read (h02buc) */
  /* nag_ip_mps_free (h02bvc), see above. */
  nag_ip_mps_free(&a, &bl, &bu, &intvar, &c, &x);

  /* Free options memory */
  /* nag_ip_free (h02xzc).
   * Free NAG allocated memory from option structures
   */
  nag_ip_free(&options, "all", &fail);
  if (fail.code != NE_NOERROR)
    {
      Vprintf("Error from nag_ip_free (h02xzc).\n%s\n", fail.message);
      exit_status = 1;
      goto END;
    }
 END:
  return exit_status;
}