课堂小练习 设计、定义并实现Complex类

定义一个负数类Complex使得下面的代码能够工作。（课本P145）

#include<iostream>
#include<cmath>
using namespace std;
class Complex{
    public:
        Complex(double n_real,double n_imaginary);
        Complex(Complex &c1);
        void add(Complex &c2);
        double mod();
        void show();
    private:
        double real,imaginary;
};
Complex::Complex(double n_real=,double n_imaginary=):real(n_real),imaginary(n_imaginary){
}
Complex::Complex(Complex &c1){
    real=c1.real;
    imaginary=c1.imaginary;
}
void Complex::add(Complex &c2){
    real+=c2.real;
    imaginary+=c2.imaginary;
}
double Complex::mod(){
    return sqrt(real*real+imaginary*imaginary);
}
void Complex::show(){
    if(imaginary>)
       cout<<real<<"+"<<imaginary<<"i"<<endl;
    else
       cout<<real<<imaginary<<"i"<<endl;
}
int main(){
    Complex c1(,);
    cout<<"c1=";
    c1.show();
    Complex c2(4.5);
    cout<<"c2=";
    c2.show();
    Complex c3(c1);
    cout<<"c3=";
    c3.show();
    c1.add(c2);
    cout<<"c1+c2=";
    c1.show();
    cout<<"|c1|=";
    cout<<c1.mod()<<endl;
    return ;
}

运行结果如下