/* D01PA_P0W_F C++ Header Example Program.
 *
 * Copyright 2019 Numerical Algorithms Group.
 * Mark 27, 2019.
 */

#include <nag.h>
#include <nagad.h>
#include <stdio.h>
#include <math.h>
#include <iostream>
using namespace std;

extern "C"
{
  static void NAG_CALL functn(void* &ad_handle,
                              const Integer& ndim,
                              const double x[],
                              double& ret,
                              Integer iuser[],
                              double ruser[]);
}

int main(void)
{
  // Scalars
  int     exit_status = 0;
  Integer mxord = 5, ndim = 3, sdvert = 8, ldvert = 4;

  cout << "D01PA_P0W_F C++ Header Example Program Results\n\n";

  // Allocate memory
  double  *finvls = 0, *vert = 0, *vert_in = 0;
  finvls = new double [mxord];
  vert   = new double [ldvert*sdvert];

  for (int i=0;i<ndim*ldvert;i++) {
    vert[i] = 0.0;
  }
  for (int i=1;i<ndim*ldvert;i=i+ldvert+1) {
    vert[i] = 1.0;
  }

  void    *ad_handle = 0;

  cout << "\n Maxord   Estimated      Estimated         Integrand\n";
  cout << "           value         accuracy        evaluations\n";
  cout.setf(ios::scientific,ios::floatfield);
  cout.precision(4);
  Integer minord = 0, nevals = 1;
  for (Integer maxord = 1; maxord<=mxord; maxord++) {
      
    // Call the passive routine
    double  esterr, ruser[1];
    Integer iuser[1];
    Integer ifail = 0;
    d01pa_p0w_f_(ad_handle,ndim,vert,ldvert,sdvert,functn,minord,
                  maxord,finvls,esterr,iuser,ruser,ifail);
    double finv_r = finvls[maxord-1];
    cout.width(5); cout << maxord;
    cout.width(15); cout << finv_r;
    cout.width(15); cout << esterr;
    cout.width(12); cout << nevals << endl;
      
    nevals = (nevals*(maxord+ndim+1))/maxord;
  }

  cout.setf(ios::right);
  cout.precision(4);
  cout << "\n Solution, I = ";
  double ans_value = finvls[mxord-1];
  cout.width(12); cout << ans_value << endl;

  delete [] finvls;
  delete [] vert;
  return exit_status;
}
static void NAG_CALL functn(void* &ad_handle,
                            const Integer& ndim,
                            const double x[],
                            double& ret,
                            Integer iuser[],
                            double ruser[])
{
  double tmp1;
  tmp1 = x[0] + x[1] + x[2];
  ret = exp(tmp1)*cos(tmp1);
  return;
}