typedef struct{  short v, h;} S;S a;f (S pnt){  S mpnt, mtp;  (&pnt)->v -= 1;  mpnt = pnt;  mtp = a;  if (mtp.v != mpnt.v)    {      S tpnt;      tpnt = mtp;      mtp = mpnt;      mpnt = tpnt;    }}