question: public static double abs ( Z z ) { double are , aim , rho ; are = Math . abs ( z . re ) ; aim = Math . abs ( z . im ) ; if ( are + aim == 0 ) return 0 ; if ( are >= aim ) { rho = aim / are ; return are * Math . sqrt ( 1 + rho * rho ) ; } else { rho = are / aim ; return aim * Math . sqrt ( 1 + rho * rho ) ; } }
target:  Computes the absolute value of a Z.