3.cpp

#include <iostream> 
using namespace std;
class Complex 
  {public:   
  Complex()
   {real=0;imag=0;}    
  Complex(double r,double i)
  {real=r;imag=i;}   
  Complex operator+(Complex &c2);   
  Complex operator+(int &i); 
   friend Complex operator+(int&,Complex &); 
      void display();  
 private:  
	  double real;  
	  double imag;  
 };
Complex Complex::operator+(Complex &c)
 {return Complex(real+c.real,imag+c.imag);} 
  Complex Complex::operator+(int &i) 
  {return Complex(real+i,imag);}  
void Complex::display()
 {cout<<"("<<real<<","<<imag<<"i)"<<endl;} 
  Complex operator+(int &i,Complex &c)
   {return Complex(i+c.real,c.imag);} 
  int main()
	 {Complex c1(3,4),c2(5,-10),c3;
		  int i=5;  
	 c3=c1+c2; cout<<"c1+c2=";  c3.display(); 
     c3=i+c1;  cout<<"i+c1=";   c3.display(); 
	 return 0; 
	 }