#include<iostream>

#include<cmath>

using namespace std;

class complex{

    public:

        complex(double a,double b=);

        complex(complex &p);

        void show();

        void madd(complex q);

        double mod();

    private:

        double real;

        double imag;

};

complex::complex(double a,double b)

{

    real=a;

    imag=b;

}

complex::complex(complex &p)

{

    real.p.real;

    imag=p.imag;

}

void complex::show()

{

    if(real!=)

    {

        if(imag!=)

            cout<<real<<'+'<<imag<<'i'<<endl;

        else

            cout<<real<<endl;

    }

    else

    {

        if(imag!=)

            cout<<imag<<'i'<<endl;

        else

            cout<<<<endl;

    }

}

void complex::madd(complex q)

{

    real+=q.real;

    imag+=q.imag;

}

double complex::mod()

{

    double x,y;

    x=real*real+imag*imag;

    y=sqrt(x);

    return y;

}

int main()

{

    complex c1(,);

    complex c2(4.5);

    complex c3(c1);

    c1.show();

    c2.show();

    c3.show();

    cout<<c3.mod()<<endl;

    c1.madd(c2);

    c1.show();

    return ;

}