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The documentation for the current release is also available on this site.
NAG Library Manual, Mark 28.7
Interfaces:  FL   CL   CPP   AD 
NAG FL Interface Introduction
Example description
 C02ANF Example Program Results

  Roots of quartic equation           Error estimates
                                    (machine-dependent)

  z =   3.0000E+00 -2.0000E+00*i          1.8E-15
  z =   1.0000E+00 -2.0000E+00*i          1.8E-15
  z =  -2.0000E+00 +1.0000E+00*i          1.8E-15
  z =  -2.0000E+00 +3.0000E+00*i          1.8E-15