C / C++ / MFC

void myfunc(char *first, ...)

int average( int first, ... )
{
   int count = 0, sum = 0, i = first;
   va_list marker;

   va_start( marker, first );     /* Initialize variable arguments. */
   while( i != -1 )
   {
      sum += i;
      count++;
      i = va_arg( marker, int);
   }
   va_end( marker );              /* Reset variable arguments.      */
   return( sum ? (sum / count) : 0 );
}

printf( "Average is: %d\n", average( 2, 3, 4, -1 ) );

CFont m_Font;
CIpAddressCtrl m_IpAddress;

m_Font.CreateFont(...);
m_IpAddress.SetFont(&m_Font);