Forum Debian Users Gang

#include <iostream.h>

class kwadrat{
  private:
   int a;

  public:
  kwadrat()
   {a=1}

  kwadrat (kwadrat & x)
  {
    a = x.a;
  }

  kwadrat (int a0)
  {
    a=a0;
  }

  void operator-=(kwadrat & kw)
  {
    this->a-=kw.a;
  }

  kwadrat & operator=(kwadrat & kw)
  {
    a=kw.a;
    return *this;
  }

  kwadrat operator-(kwadrat & kwa)
  {
   return kwadrat(a-kwa.a);
  }

   ~kwadrat() {}

    friend ostream& operator<<(ostream & os, kwadrat & xx);

};


ostream & operator<<(ostream & os, kwadrat & xx)
 {
   os << xx.a << endl;
   return os;
 }

int main(void)
{
 kwadrat cos cos1(10), cos2(7);
 cout << "pocz cos1=" << cos1;
 cout << "pocz cos2=" << cos2;
 cout <<" cos = cos1 - cos2" << endl;
 cos = cos1 - cos2;
 cout << "cos=" << cos;
 cout << "cos=" << cos1;
 cout << "cos=" << cos2;
 return 0;
}