#include<iostream>

#include<math.h>

using namespace std;

class Complex{

public:

    Complex(double real0=,double imaginary0=);

    Complex(Complex &p);

    void add(Complex a);

    void show();

    double mod();

private:

    double real;

    double imaginary;

};

Complex::Complex(double real0,double imaginary0)

{

    real=real0;

    imaginary=imaginary0;

}

Complex::Complex(Complex &p)

{

    real=p.real;

    imaginary=p.imaginary;

}

void Complex::add(Complex b)

{

    real=real+b.real;

    imaginary=b.imaginary;

}

void Complex::show()

{

    cout<<real<<"+"<<imaginary<<"i"<<endl;

}

double Complex::mod()

{

    double x;

    x=sqrt(real*real+imaginary*imaginary);

    return x;

}

int main()

{Complex c1(,);

 Complex c2(4.5);

 Complex c3(c1);

 c3.show();

 cout<<c1.mod()<<endl;

 return ;

}