#include <cmath>
#include <iostream>

class complex {
public:
  complex(double re, double im) : re_{re}, im_{im} {}

  double get_real() const { return re_; }
  complex& set_real(double re) { re_ = re; return *this; }

  double get_imaginary() const { return im_; }
  complex& set_imaginary(double im) { im_ = im; return *this; }

  double abs() const { return std::sqrt(re_ * re_ + im_ * im_); }

private:
  double re_;
  double im_;
};

int main() {
  complex c{0., 0.};
  c.set_real(42.).set_imaginary(42.);
  std::cout << "|"
	    << c.get_real()
	    << " + "
	    << c.get_imaginary()
	    << "i| = "
	    << c.abs()
	    << std::endl;
}