complex类

#include <iostream> 
#include <cmath>
using namespace std;
class Complex{
    public:
        Complex(double real0,double imaginary0);
        Complex(double real0);
        Complex(Complex &a);
        void add(Complex b);
        void show();
        double mod();
    private:
        double real;
        double imaginary; 
        
};
Complex::Complex(double real0,double imaginary0)
{  real=real0;imaginary=imaginary0;}
Complex::Complex(double real0):real(real0){
}
Complex::Complex(Complex &a)
{ real=a.real;imaginary=a.imaginary;}
void Complex::add(Complex b){
    real=real+b.real;
    imaginary=imaginary+b.imaginary;
}
void Complex::show()
{
    cout<<real<<"+"<<imaginary<<"i"<<endl;
}
double Complex::mod()
{
    double m;
    m=sqrt(real*real+imaginary*imaginary);
    return m;
}
int main()
{
    Complex c1(3,5);
    Complex c2(4.5);
    Complex c3(c1);
    c1.add(c2);
    c1.show();
    cout<<c1.mod();
    return 0;
}