/* D01GA_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;

int main(void)
{
  // Scalars
  int     exit_status = 0;
  Integer n = 21;
  double  a = 1.0;

  cout << "D01GA_P0W_F C++ Header Example Program Results\n\n";

  // Allocate memory
  double  *x = 0, *y = 0;

  x = new double [n];
  y = new double [n];

  // Initialize variables
  for (int i = 0; i < n; i++) {
    double xr = (1.0*i)/(1.0*(n-1));
    double tmp;
    x[i] = xr;
    tmp = a*x[i];
    y[i] = 4.0/(1.0 + tmp*tmp);
  }

  // Call the passive routine
  Integer ifail = 0;
  void    *ad_handle = 0;
  double  ans, er;
  d01ga_p0w_f_(ad_handle,x,y,n,ans,er,ifail);

  cout.setf(ios::scientific,ios::floatfield);
  cout.setf(ios::right);
  cout.precision(4);
  cout << "\n Solution, ans = ";
  cout.width(12); cout << ans << endl;

  delete [] x;
  delete [] y;
  return exit_status;
}