#include <iostream.h>

class cLuku {
  int a;
public:
  virtual int low()  { return 0;  }
  virtual int high() { return 10; }
  cLuku(int ia=0) { set(ia); }
  int set(int n);
  int get(void) const;
  int lisaa(int i=1) { return set(get()+i); }
};


int cLuku::set(int n)
// esim n = -65, [0,59]  => a = 55; yli = -2
{
  int ero = high()-low()+1;      //  60
  int arvo = n - low();        //  -65
  int jj = arvo%ero;         //  55
  if ( jj < 0 ) jj += ero;   // riippuu ohj. kielest„ voiko tulla <0
  a = jj + low();              // Nyt jj=55  a=55
  return (arvo-jj)/ero;      // -65-55=-120 => -2

}

int cLuku::get(void) const
{
  return a;
}

template <int YLA>
class cLyla : public cLuku {
public:
  int high() { return YLA-1; }
};

class cKello {
  cLyla<60> m;
  cLyla<24> h;
public:
  cKello(int ih=0, int im=0) { set(ih,im); }
  int set(int ih, int im) { return h.set(ih+m.set(im)); }
  int lisaa(int i) { return h.lisaa(m.lisaa(i)); }
  friend ostream &operator<<(ostream &os, const cKello &k) {
    os << k.h.get() << ":" << k.m.get(); return os; }
};

int main(void)
{
  cLuku luku(59);
  int yli = luku.set(-65);
  cout << "a= " << luku.get() << " yli " << yli << endl;
  cKello k(7,15);
  cout << k << " + 240 min = ";
  k.lisaa(240);
  cout << k << endl;
  return 0;
}