Kod jednostavne igrice

Code:
#include <cstdlib>
#include <iostream>
#include <winbgim.h>
#include <ctime>


using namespace std;

class objekt
{
  private:
  int x;  
  char kretanje;
  public:
     objekt()
     {
        x=290;
     }
     void pomak(char);
     void crtaj();
  };
   void objekt::pomak(char tipka)
    {
        kretanje=tipka;
        if(kretanje==75)
        {
          setcolor(WHITE);
          rectangle(x,432,x+60,438);
          setcolor(BLACK);
          x=x-5;    
         }
        if(kretanje==77)
        {
          setcolor(WHITE);
          rectangle(x,432,x+60,438);
          setcolor(BLACK);
          x=x+5;
          }
    }
     void objekt::crtaj() 
     {
      rectangle(x,432,x+60,438);
     }             
   class bomba
   {
    private:
         int x,y;
    public:
     bomba()
     {        
       x=(static_cast<float>(rand())/RAND_MAX)*620;
       y=-((static_cast<float>(rand())/RAND_MAX)*480);
     }
     void crtanje();
     void brisanje();
 };
void bomba::crtanje()
 {
     rectangle(x,y,(x+20),(y+5));
 }    
 void bomba::brisanje()
 {
      setcolor(WHITE);
      rectangle(x,y,(x+20),(y+5));
      setcolor(BLACK);
      y=y+5;  
      if(y>490)
      {
               y=-((static_cast<float>(rand())/RAND_MAX)*480);
               x=(static_cast<float>(rand())/RAND_MAX)*620;
      }
  }
  int main()
  {
      int gdriver=9;
      int gmode=2;
      initgraph(&gdriver,&gmode,"");
      setbkcolor(WHITE);
      setcolor(BLACK);
      cleardevice();
      
      char odgovor='d';
      srand(time(NULL));
      bomba bomba1,bomba2,bomba3;
      objekt brod;
      brod.crtaj();
      
      do
      {
           bomba1.brisanje();
           bomba2.brisanje();
           bomba3.brisanje();
           bomba1.crtanje();
           bomba2.crtanje();
           bomba3.crtanje();
           
           delay(100);
           
       if(kbhit())
       {
                  odgovor=getch();
                  
                  brod.pomak(odgovor);
       }               
        brod.crtaj();
       }
       while(odgovor!='k');
  return 0;
}