4-3

#include <iostream.h>class Complex{public:Complex(){ real=0; imag=0;}Complex(double r,double i){ real=r; imag=i;}    Complex operator +(Complex &);Complex operator +(int &);friend Complex operator +(int &,Complex &);void display(){ cout<<"("<<real<<"+"<<imag<<"i)"<<endl;}private:double real;double imag;};Complex Complex::operator +(Complex &c2){ return Complex(real+c2.real,imag+c2.imag);}Complex Complex::operator +(int &i){ return Complex(real+i,imag);}Complex operator +(int &i,Complex &c3){ return Complex(i+c3.real,c3.imag);}int main(){ int i=2; Complex c1(2,4),c2(1,2),c3,c4,c5; c3=c1+c2; cout<<"c3=c1+c2="; c3.display(); c4=c1+i; cout<<"c4=c1+i="; c4.display(); c5=i+c2; cout<<"c5=i+c2="; c5.display(); return 0;}