定义一个复数类Complex

#include<iostream>
#include<math.h>
using namespace std;
class Complex{
public:
    Complex(double real0=,double imaginary0=);
    Complex(Complex &p);
    void add(Complex a);
    void show();
    double mod();
private:
    double real;
    double imaginary;
};
Complex::Complex(double real0,double imaginary0)
{
    real=real0;
    imaginary=imaginary0;
}
Complex::Complex(Complex &p)
{
    real=p.real;
    imaginary=p.imaginary;
}
void Complex::add(Complex b)
{
    real=real+b.real;
    imaginary=b.imaginary;
}
void Complex::show()
{
    cout<<real<<"+"<<imaginary<<"i"<<endl;
}
double Complex::mod()
{
    double x;
    x=sqrt(real*real+imaginary*imaginary);
    return x;
}
int main()
{Complex c1(,);
 Complex c2(4.5);
 Complex c3(c1);
 c3.show();
 cout<<c1.mod()<<endl;
 return ;
}

Complex

刚开始没定义初始值，结果怎么都出不来，请同学帮我看了一下，问题就解决了。反思了一下自己，基本知识还是没掌握牢固。还是要打好基础，一步一步来。