class Screen
   {
         private:
                 char* pixels;
                 int height;//rows
                 int width;//columns
         public: 
                friend ostream& operator<<(ostream & out, const Screen & TV);
                Screen(int=10, int=10);
                Screen(const Screen&);
                ~Screen(void);
                void setH(int );
                int getH(void)const;
                void setW(int);
                int getW() const;
                void setPoint(const Point&,char);
                void resetPoint(const Point&);
                void clear(void);
                void draw(void)const;
   };

// implementation of screen class

   Screen::Screen(int r,int c)
   {
         int size;
         height=r;
         width=c;
         size=r*c;
         pixels=new char[size];
         for(int i=0;i<r;i++)
            {
              for(int j=0;j<c;j++)
                 {
                  *(pixels+(i*c)+j)='.';
                  }
            }
   }             
      
      
   Screen::~Screen(){delete []pixels;}
   
   void Screen::setPoint(const Point & object, char c)
   {
        int i=object.getX();
        int j=object.getY();        
        *(pixels+(i*width)+j)=c;
   }          
                 
      
   
   void Screen::resetPoint(const Point& object)
   {
        int x_del,y_del;
        x_del=object.getX();
        y_del=object.getY();
        *(pixels+(x_del*width)+y_del)='.';
   }   
   
   void Screen::clear()
   { int i,j;
         for(i=0;i<height;i++){
             for(j=0;j<width;j++)
                 *(pixels+(i*width)+j)='.';}
   }
    
    void Screen::setH(int row)
    {
         height=row;
    }
    
    int Screen::getH()const{ return height;}
    
    void Screen::setW(int col)
    {
         width=col;
    }
    
    int Screen::getW() const{ return width;}
    
         
    void Screen::draw()const
   {
        for( int i=0;i<height;i++)
            for( int j=0;j<width;j++)
                { cout<<*(pixels+(i*width)+j);
                 cout<<endl;}
                 
   } 
        
    ostream& operator<<(ostream & out, const Screen & TV)
    { 
             for(int i=0;i<TV.height;i++)
                 {for(int j=0;j<TV.width;j++)
                    out<<*(TV.pixels+(i*TV.width)+j);
                    out<<endl;}
    }
  

for the moment my main is:
int main()
{
    Screen ecran(20,30);
    cout<<"\n\nPrinting a blank Screen"<<endl;
    cout<<ecran<<endl;
    return 0;
}