#include <iostream>
#include <cstdlib>

using namespace std;

class Razlomak{
public:
  explicit Razlomak(int x = 0, int y = 1)
    :_brojilac(x), _imenilac(y)
  {

  }
  int vratiBrojilac() const {
    return this->_brojilac;
  }
  int vratiImenilac() const {
    return this->_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 "Format razlomka nije dobar";
  }
  Razlomak operator+(const Razlomak &b) const {
    Razlomak tmp;
    tmp.postaviImenilac(vratiImenilac() * b.vratiImenilac());
    tmp.postaviBrojilac(vratiBrojilac() * b.vratiImenilac() + vratiImenilac() * b.vratiBrojilac());
    return tmp;
  }
  Razlomak operator*(const Razlomak &b) const {
    return Razlomak(_brojilac * b._brojilac, _imenilac * b._imenilac);
  }
  Razlomak operator~() const {
    return Razlomak(_imenilac, _brojilac);
  }
  Razlomak operator++() {
    _brojilac += _imenilac;
    return *this;
  }
  Razlomak operator++(int) {
    Razlomak tmp = *this;
    _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;

  cout << "Unesi razlomak r i p: ";

  try {
    cin >> r >> p;
  }
  catch (const char *s) {
    cerr << s << endl;
    exit(EXIT_FAILURE);
  }
  catch (...) {
    cerr << "Nepoznat izuzetak" << endl;
    exit(EXIT_FAILURE);
  }
 
  cout << "r = " << r << endl;
  cout << "p = " << 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 = " << (double)r << endl;

  cout << "r + 2 = " << r + 2 << endl;

  return 0;
}