////   This file contains the C++ code from Program A.5 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C++"//   by Bruno R. Preiss.////   Copyright (c) 1998 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm0A_05.cpp//double Complex::Real () const    { return real; }double Complex::Imag () const    { return imag; }double Complex::R () const    { return std::sqrt (real * real + imag * imag); }double Complex::Theta () const    { return atan2 (imag, real); }void Complex::Put (ostream& s) const    { s << real << "+" << imag << "i"; }