// greske.h

#ifndef _greske_h_
#define _greske_h_
#include <iostream.h>

class GIndeks {
  int ind;
public:
  GIndeks (int i) { ind = i; }
  friend ostream &operator<< (ostream &d, const GIndeks &g)
    { return d << "*** Nedozvoljeni indeks: " << g.ind; }
};

class GOpseg {
  int min, max;
public:
  GOpseg (int mi, int ma) { min = mi; max = ma; }
  friend ostream &operator<< (ostream &d, const GOpseg &g)
    { return d << "*** Nedozvoljeni opseg: " << g.min << " - " << g.max; }
};

#endif


// niz.h

#ifndef _niz_h_
#define _niz_h_
#include "greske.h"

class Niz {
  double *a;
  int min, max, duz;
  void kopiraj (const Niz &n);
  void brisi () { delete a; a = 0; }
public:
  Niz (int mi=1, int ma=10);
  ~Niz () { brisi (); }
  Niz & operator= (const Niz &n) {
    if (&n != this) { brisi (); kopiraj (n); }
    return *this;
  }
  double & operator[] (int i) const {
    if (i<min || i>max) throw GIndeks (i);
    return a[i-min];
  }
  int operator+ () const { return duz; }
  int minInd () const { return min; }
  int maxInd () const { return max; }
};

#endif


// niz.cpp

#include "niz.h"

Niz::Niz (int mi, int ma) {
  if ((max=ma)<(min=mi)) throw GOpseg (mi, ma);
  a = new double [duz=max-min+1];
  for (int i=0; i<duz; a[i++]=0);
}

void Niz::kopiraj (const Niz &n) {
  a = new double [duz=n.duz];
  min = n.min; max = n.max;
  for (int i=0; i<duz; i++) a[i] = n.a[i];
}


// funkcija.h

#ifndef _funkcija_h_
#define _funkcija_h_

class Funkcija {
public:
  virtual double operator() (double x) const =0;
  virtual ~Funkcija () {}
protected:
  virtual void pisi (ostream &d) const =0;
  friend ostream & operator<< (ostream &d, const Funkcija &f)
    { f.pisi (d); return d;}
};

#endif


// polinom.h

#ifndef _polinom_h_
#define _polinom_h_
#include "niz.h"
#include "funkcija.h"

class Polinom: public Funkcija {
  Niz p;
public:
  Polinom (int n=3): p(0,n) {}
  double operator() (double x) const;
  double & operator[] (int i) { return p[i]; }
  int operator+ () const { return p.maxInd (); }
private:
  void pisi (ostream &d) const;
};

#endif


// polinom.cpp

#include "polinom.h"

double Polinom::operator() (double x) const {
  double s = 0;
  for (int i=p.maxInd(); i>=0; (s*=x)+=p[i--]);
  return s;
}

void Polinom::pisi (ostream &d) const {
  d << "p[";
  for (int i=p.maxInd(); i>=0; i--)
    { d << p[i]; if (i > 0) d << ','; }
  d << ']';
}


// glavni.cpp

#include "polinom.h"
#include <iostream.h>

int main () {
  int n; cout << "Red polinoma? "; cin >> n;
  Polinom p(n);
  try {
    while (1) {
      cout << "Indeks i vrednost koeficijenta? ";
      int i; double a; cin >> i >> a;
      p[i] = a;
    }
  } catch (GIndeks) {}
  cout << "Polinom= " << p << endl;
  double xmin, xmax, dx; cout << "xmin, xmax, dx? "; cin >> xmin >> xmax >> dx;
  cout << endl;
  for (double x=xmin; x<=xmax; x+=dx)
    cout << x << ' ' << p(x) << endl;
  return 0;
}