ld
                of the machine (see LAPACK Library Routine DLAMCH);
          = 3:  if on entry, either C = 0.0 and the root -B/A
                overflows or A, B and C are non-zero and the largest
                real root in magnitude cannot be computed without
                overflow; in this case Z1RE contains BIG and Z1IM
                contains zero;
          = 4:  if the roots cannot be computed without overflow; in
                this case Z1RE, Z1IM, Z2RE and Z2IM are unassigned.

</PRE>
<A