int main()
{
  HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
  SetConsoleTextAttribute(hOut, FOREGROUND_BLUE | BACKGROUND_RED);

  std::cout << "Hello world";
  system("pause");
}

   char buffer[80*4];
   FillMemory(buffer, 80*4, 'A');
   HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
     
   COORD coord;
   coord.X = 0;
   coord.Y = 0;
     
   for(int i = 0; i<80*4; i++)
   {
    buffer[i] = 'B';
    SetConsoleCursorPosition(out,coord);
    WriteConsoleA(out, buffer, 80*4,0,0);
    Sleep(10);
   }
   system("pause");