#include<iostream>
#include<cmath>
using namespace std;
class Complex{
    public:
    Complex(double newrl=0,double newim=0) ;//默认值不能丢。 
    Complex(Complex &c2);
    void add(Complex c2);
    void show();
    double qumo();
    private:
        double imaginary,real;
}; 
Complex::Complex(double newrl,double newim){
    real=newrl;
    imaginary=newim; 
}
Complex::Complex(Complex &c2){
    real=c2.real;
    imaginary=c2.imaginary;//复制函数。 
}
void Complex::add(Complex c)
{
    real+=c.real;
    imaginary+=c.imaginary;//另一种形式的加法。 
}
double Complex::qumo(){
    double mo;
    mo=sqrt(real*real+imaginary*imaginary);
    return mo;
}//取模的实现。 
void Complex::show(){
    cout<<real<<"+"<<imaginary<<"i"<<endl;    
}
int main(){ 
    Complex c1(3,5);
    Complex c2(4.5);
    Complex c3(c1);
    c1.add(c2);
    c1.show();
    c3.show(); 
    cout<<c1.qumo()<<endl;
    return 0;
}