#include 
     
       #include 
      
       using namespace std;class Complex{    public:        Complex(double real0,double imaginary0);        Complex(double real0);        Complex(Complex &a);        void add(Complex b);        void show();        double mod();    private:        double real;        double imaginary;         };Complex::Complex(double real0,double imaginary0){  real=real0;imaginary=imaginary0;}Complex::Complex(double real0):real(real0){}Complex::Complex(Complex &a){ real=a.real;imaginary=a.imaginary;}void Complex::add(Complex b){    real=real+b.real;    imaginary=imaginary+b.imaginary;}void Complex::show(){    cout<
       
        <<"+"<
        
         <<"i"<