#include <iostream.h>

class cLuku {
  int a;
  int low;
  int high;
public:
  cLuku(int ia,int il,int ih) { low=il; high=ih; 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;
}


class cKello {
  cLuku h,m;
public:
  cKello(int ih=0, int im=0) : h(0,0,23),m(0,0,59) { 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(0,0,59);
  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;
}