#include<iostream>

#include<cmath>

using namespace std;

class complex

{

public:

    complex(double shi0 = , double xu0 = )

    {

        shi = shi0;

        xu = xu0;

    }

    complex(complex &p);

    void add(complex &t);

    void show();

    double mod();

private:

    double shi;

    double xu;

};

complex::complex(complex &p)

{

    shi = p.shi;

    xu = p.xu;

}

void complex::add(complex &t)

{

    shi = shi + t.shi;

    xu = xu + t.xu;

}

void complex::show()

{

    cout << shi << '+' << xu << 'i' << endl;

}

double complex::mod()

{

    return sqrt((shi*shi) + (xu*xu));

}

int main()

{

    complex c1(, );

    complex c2 = 4.5;

    complex c3(c1);

    c1.add(c2);

    c1.show();

    cout << c1.mod();

    return ;

}