/* C05AY_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 <nagx07.h>
#include <iostream>
#include <string>
using namespace std;

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

int main (void)
{
  int               exit_status = 0;

  cout << "C05AY_P0W_F C++ Header Example Program Results\n\n";

  // Skip first line of data file
  string            mystr;
  getline (cin, mystr);

  // Read problem parameters
  double            a, b, eps, eta, ruser[1];
  cin >> a;
  cin >> b;
  cin >> eps;
  cin >> eta;
  cin >> ruser[0];

  // Call P0W routine
  double            x;
  Integer           iuser[1];
  iuser[0] = 0;
    
  Integer           ifail = 0;
  void              *ad_handle=0;
  c05ay_p0w_f_(ad_handle,a,b,eps,eta,f,x,iuser,ruser,ifail);

  cout.setf(ios::scientific,ios::floatfield);
  cout.precision(5);

  cout << " Solution, x = " << x << endl;
  return exit_status;
}

static void (NAG_CALL f)(void* &ad_handle,
                         const double &x,
                         double &z,
                         Integer iuser[],
                         double ruser[])
{
  z = exp(-x) - x*ruser[0];
  return;
}