Some Hints for Assignment 1

  There are two functions needed for you check whether a real number is
  equal to a complex number.  The basic idea is that a complex number
  z = a+bi is equal to a real number x if and only if a == x and b == 0.
  If
   cmplx z;
   double x;

   You want to be able to execute the bool operators x == z and z == x.
   You need separate functions for these.

   The first of these is a friend function whose declaration is:
      friend bool operator==(double,const cmplx&);

   The second is amember function whose declaration is:
      bool operator==(const cmplx&) const;


The definitions of the functions are in the file cmplx.cxx, or cmplx.cpp if
you prefer.  I'm giving these away.  They are:

   bool cmplx::operator==(double x) const
    {
     return rpart == x && ipart == 0;
    }

   bool operator==(double x,const cmplx&w) // friend
    {
     return w == x;
    }

   Notice that the friend function actually calls the member function.