#include <iostream>
#include <cstdlib>

using namespace std;

class Razlomak {
public:
  explicit Razlomak(int a = 0, int b = 1)
    :_brojilac(a), _imenilac(b)
  {

  }
  int vratiBrojilac() const {
    return _brojilac;
  }
  int vratiImenilac() const {
    return _imenilac;
  }
  void postaviBrojilac(int x) {
    _brojilac = x;
  }
  void postaviImenilac(int x) {
    _imenilac = x;
  }
  void pisi(ostream& izlaz) const {
    izlaz << _brojilac << "/" << _imenilac;
  }
  void citaj(istream& ulaz) {
    char c;
    ulaz >> _brojilac >> c >> _imenilac;
    if (c != '/')
      throw "Neispravan format razlomka";
  }
  Razlomak operator+(const Razlomak& b) const {
    return Razlomak(vratiBrojilac() * b.vratiImenilac() + vratiImenilac() * b.vratiBrojilac(), 
		    vratiImenilac() * b.vratiImenilac()
		    );
  }
  Razlomak operator*(const Razlomak& b) const {
    return Razlomak(vratiBrojilac() * b.vratiBrojilac(), 
		    vratiImenilac() * b.vratiImenilac()
		    );
  }
  Razlomak operator~() const {
    return Razlomak(_imenilac, _brojilac);
  }
  Razlomak operator++() {
    _brojilac += _imenilac;
    return *this;
  }
  Razlomak operator++(int) {
    Razlomak tmp(_brojilac, _imenilac);
    _brojilac += _imenilac;
    return tmp;
  }
  operator double() const {
    return (double)_brojilac/_imenilac;
  }
private:
  int _brojilac;
  int _imenilac;
};

ostream& operator<< (ostream& izlaz, const Razlomak& r) {
  r.pisi(izlaz);
  return izlaz;
}

istream& operator>> (istream& ulaz, Razlomak& r) {
  r.citaj(ulaz);
  return ulaz;
}

int main() {
  Razlomak r, p;

  //r.postaviBrojilac(1);
  //r.postaviImenilac(2);

  cout << "Unesi razlomake r i p: ";
  try {
    cin >> r >> p;
  }
  catch (const char *s) {
    cerr << s << endl;
    exit(EXIT_FAILURE);
  }
  catch (...) {
    cerr << "Nepoznat tip izuzetka" << endl;
    exit(EXIT_FAILURE);
  }
  
  cout << "r = " << r << endl;
  cout << "p = " << p << endl;
  cout << "r + p = " << r + p << endl;
  cout << "r * p = " << r * p << endl;
  cout << "~r = " << ~r << endl;

  cout << "r = " << r << endl;
  cout << "++r = " << ++r << endl;
  cout << "r = " << r << endl;

  cout << "r = " << r << endl;
  cout << "r++ = " << r++ << endl;
  cout << "r = " << r << endl;

  cout << "(double)r = " << (double)r << endl;

  cout << "r + 1 = " << r + 1 << endl;
  
  return 0;
}