C02AKF Example Program Results Roots of cubic equation Error estimates (machine-dependent) z = 1.0000E+00 +0.0000E+00*i 1.0E-15 z = -2.0000E+00 +3.0000E+00*i 1.0E-15 z = -2.0000E+00 -3.0000E+00*i 1.0E-15