Code:
class Stanje
{
      public:
             Stanje() {}
             virtual ~Stanje() {}
             virtual void Izvjestaj() = 0;
             }
             
class Normal:public Stanje
{
      public:
             Normal() { Izvjestaj(); }
             virtual ~Normal() {}
             virtual void  Izvjestaj() { cout<<"Izvjestavam normalno stanje..." << endl;}
             }
             
class Error:public Stanje
{
      public:
             Error() { Izvjestaj(); }
             virtual ~Error() {}
             virtual void Izvjestaj() {cout<<"Izvjestaj los!" << endl;}
             }
             
class Alarm:public Stanje
{
      public:
             Alarm() { Izvjestaj(),Upozorenje(); }
             virtual ~Alarm() {}
             virtual void Upozorenje() { cout<<"UPOZORENJE!" << endl;}
             virtual void Izvjestaj() { cout<<"Generalni alarm los!" << endl;}
             virtual void Poziv() = 0;
             }
             
class VatreniAlarm:public Alarm
{
      public:
             VatreniAlarm() { Izvjestaj(); }
             virtual ~VatreniAlarm() {}
             virtual void Poziv() { cout<<"Poziv za vatrogasce." << endl;}
             virtual void Izvjestaj() {cout<<"Izvjestaj,pozar!" << endl;}
             }
             
int main()
{
    int input,okay = 1;
    Stanje * pStanje;
    
    while(1)
    {
            cout<<"(0)Izlaz (1)Normal (2)Pozar: ";
            cin>>input;
            okay = input;
            
            switch(input)
            {
                         case 0:
                              break;
                         case 1:
                              pStanje = new Normal;
                              delete pStanje;
                              break;
                         case 2:
                              pStanje = new VatreniAlarm;
                              delete pStanje;
                              break;
                         default:
                                 pStanje = new Error;
                                 delete pStanje;
                                 okay = 0;
                                 break;
                                 }
                                 }
                                 
char a;
cin>>a;
return 0;
}