/* MYSTREAM.CPP -eli cPiste tietovirtaan ja sielt„ takaisin */
#include <iostream.h>

class cPiste {
  int x,y;
public:
  cPiste(int ix=0, int iy=0) { x = ix; y = iy; }
  friend ostream &operator<< (ostream &os, const cPiste &p);
  friend istream &operator>> (istream &is, cPiste &p);
};

ostream &operator<< (ostream &os, const cPiste &p)     // Inserter
{
  os << '(' << p.x << ',' << p.y << ')';
  return os;
}

int skip(istream &is, char s)
{
  char c;
  is >> c;
  if ( c != s ) { is.putback(c); return 0; }
  return 1;
}

istream &operator>> (istream &is, cPiste &p)           // Extractor
{
  int sulku = skip(is,'(');
  is >> p.x;  skip(is,',');
  is >> p.y;
  if ( sulku ) skip(is,')');
  return is;
}

istream &hopute(istream &is)                           // IO-manipulaattori
{
  cout << "Anna uusi cPiste muodossa (x,y) tai x,y tai x y >";
  return is;
}

int main(void)
{
  cPiste p(3,7);
  do {
    cout << "cPiste on: " << p << endl;
    cin >> hopute >> p;
  } while ( !cin.eof() && !cin.fail() );
  return 0;
}