实验Complex

#include<iostream>
#include<cmath>
using namespace std;
class Complex
{
    public:
        Complex (double xx=,double yy=):x(xx),y(yy){}
        Complex (Complex &c):x(c.x),y(c.y){}
        void show()
        {
            cout<<x<<"+"<<y<<"i"<<endl;
        }
        void add(Complex &c)
        {
             x=x+c.x;
            y=y+c.y;
        }
        double mod()
        {
            double m=sqrt(x*x+y*y);
            return m;
        }

    private:
        double x,y;
 } ;
 int main ()
 {
     Complex c1(,);
     cout<<"c1=";
     c1.show();
     cout<<"|c1|="<<c1.mod()<<endl;
     Complex c2(4.5);
     cout<<"c2=";
     c2.show();
     Complex c3(c1);
     cout<<"c3=";
     c3.show();
     c1.add(c2);
     cout<<"|c2|=";
     c1.show();
    return ;
 }