//--------------------------------------------
//  CLASSES : data structures. (2) 
//--------------------------------------------
#include  <iostream.h> 
//--------------------------------------------
// no need of destructors: 
//        members are all public
// use of overloading:     
//        + is for float and complex numbers
//--------------------------------------------
class complex
{public : 
   float re; float im;
   complex(float r, float i) : re(r), im(i) { }; // constructor
};

complex operator + (complex a1, complex a2)
{return complex(a1.re + a2.re, a1.im + a2.im);};

//--------------------------------------------
void main()
{ complex a (1.0, 4.0);  
  complex b (3.0, 7.5);
  complex c = a + b;
cout << "\n c = " << c.re << " + " << c.im << " i\n";
//------ defining a pointer to a class -------
complex *   cp = &c;
cout << "\n p.re = " << cp->re << "\n\n";
}
//--------------------------------------------
// input:   output:
//
//           c is: 4 + 11.5 i
//            
//           p.re = 4  
//
//--------------------------------------------