/* G01FC_T1W_F C++ Header Example Program.
 *
 * Copyright 2021 Numerical Algorithms Group.
 * Mark 27.2, 2021.
 */

#include <dco.hpp>
#include <iostream>
#include <nag.h>
#include <nagad.h>
#include <stdio.h>
#include <string>
using namespace std;

int main(void)
{
  int exit_status = 0;

  cout << "G01FC_T1W_F C++ Header Example Program Results\n\n";
  // Skip heading in data file
  string mystr;
  getline(cin, mystr);

  // Read number of x values
  Integer n;
  cin >> n;

  // Create AD configuration data object
  Integer ifail     = 0;
  void *  ad_handle = 0;
  nag::ad::x10aa(ad_handle, ifail);

  cout << " Deviates and derivatives\n\n";
  cout << "       p           df          x        dx/dp       dx/ddf\n";
  cout.setf(ios::scientific, ios::floatfield);
  cout.setf(ios::right);
  cout.precision(4);

  // Loop over x values
  for (Integer i = 0; i < n; ++i)
    {
      // Read next x and df
      double pr, dfr;
      cin >> pr >> dfr;

      nagad_t1w_w_rtype x, df, p;
      p  = pr;
      df = dfr;

      double inc         = 1.0;
      dco::derivative(p) = inc;
      // Call NAG AD Routine
      ifail = 0;
      nag::ad::g01fc(ad_handle, p, df, x, ifail);
      double dpdx;
      dpdx = dco::derivative(x);

      p                   = pr;
      df                  = dfr;
      dco::derivative(df) = inc;
      // Call NAG AD Routine
      ifail = 0;
      nag::ad::g01fc(ad_handle, p, df, x, ifail);
      double dpdf;
      dpdf = dco::derivative(x);

      cout.width(12);
      cout << dco::value(p);
      cout.width(12);
      cout << dco::value(df);
      cout.width(12);
      cout << dco::value(x);
      cout.width(12);
      cout << dpdx;
      cout.width(12);
      cout << dpdf << endl;
    }

  // Remove computational data object
  ifail = 0;
  nag::ad::x10ab(ad_handle, ifail);

  return exit_status;
}