#define C(X,Y) X##Y

int C(A,1Xxyz)     = 10;
int C(B,1X1X1Xxyz) = 20;	
int C(C,0Xxyz)     = 30; // macro expansion is NOT OK
int C(CC,0Xxyz)     = 30; // OK
int C(D,0xxyz)     = 40; // macro expansion is NOT OK
int C(E,0x0x0xxyz) = 50;

void main()
{
  if( A1Xxyz == 10 )
       printf( "OK\n" );
  else
       printf( "NOK\n" );

  if( B1X1X1Xxyz == 20 )
       printf( "OK\n" );
  else
       printf( "NOK\n" );

  if( C0Xxyz == 30 )
       printf( "OK\n" );
  else
       printf( "NOK\n" );

  if( D0xxyz == 40 )
       printf( "OK\n" );
  else
       printf( "NOK\n" );
       
  if( E0x0x0xxyz == 50 )
       printf( "OK\n" );
  else
       printf( "NOK\n" );
}