#include <iostream>
using namespace std;
class Complex
 {public:
   Complex(){real=0;imag=0;}
   Complex(double r,double i){real=r;imag=i;}
   Complex complex_add(Complex &c2);
   void display();
  private:
   double real;
   double imag;
 };
Complex Complex::complex_add(Complex &c2)
{return Complex(real+c2.real,imag+c2.imag);}
   
void Complex::display()
{cout<<"("<<real<<","<<imag<<"i)"<<endl;}

int main()
{Complex c1(3,4),c2(5,-10),c3;
 c3=c1.complex_add(c2);
 cout<<"c1="; c1.display();
 cout<<"c2="; c2.display();
 cout<<"c1+c2="; c3.display();
 return 0;
}