/* nag_multid_quad_adapt_1(d01wcc) Example Program
 *
 * Copyright 1998 Numerical Algorithms Group.
 *
 * Mark 5, 1998.
 * Mark 7 revised, 2001.
 *
 */

#include <nag.h>
#include <stdio.h>
#include <nag_stdlib.h>
#include <math.h>
#include <nagd01.h>

#ifdef __cplusplus
extern "C" {
#endif
static double f(Integer n, double z[], Nag_User *comm);
#ifdef __cplusplus
}
#endif

#define NDIM 4
#define MAXPTS 1000*NDIM

int main(void)
{

  Integer ndim = NDIM;
  Integer maxpts = MAXPTS;
  double a[4], b[4];
  Integer k;
  static NagError fail;
  double finval;
  Integer minpts;
  double acc, eps;
  Nag_User comm;

  Vprintf("d01wcc Example Program Results\n");
  for (k=0; k < 4; ++k)
    {
      a[k] = 0.0;
      b[k] = 1.0;
    }
  eps = 0.0001;
  minpts = 0;

  d01wcc(ndim, f, a, b, &minpts, maxpts, eps, &finval, &acc, &comm, &fail);

  if (fail.code != NE_NOERROR)
    Vprintf("%s\n",fail.message);
  if (fail.code == NE_NOERROR || fail.code == NE_QUAD_MAX_INTEGRAND_EVAL)
    {
      Vprintf("Requested accuracy =%12.2e\n", eps);
      Vprintf("Estimated value    =%12.4f\n", finval);
      Vprintf("Estimated accuracy =%12.2e\n", acc);
      return EXIT_SUCCESS;
    }
  else
    return EXIT_FAILURE;
}


static double f(Integer n, double z[], Nag_User *comm)
{

  double tmp_pwr;
  tmp_pwr = z[1]+1.0+z[3];
  return z[0]*4.0*z[2]*z[2]*exp(z[0]*2.0*z[2])/(tmp_pwr*tmp_pwr);
}