//定义一个复数类Complex,使得下面的代码能够工作。

//Complex c1(3,5)//用复数3+5i初始化c1

//complex c2=4.5//用实数4.5初始化c1

//complex c3(c1)//用c1初始化c3

//c1.add(c2)//将c1和c2相加，结果保存在c1中

//c1.show()//将c1输出（在屏幕上显示7.5+5i)

//cout<<c1.mod()//c1.mod()c1进行取模运算

#include <iostream>

#include <cmath>

using namespace std;

class Complex

{

public:

    Complex(double a=,double b=);

    Complex(Complex &p);

    void show();

    void add(Complex c1);

    double mod();

private:

    double real;

    double imaginary;

};

Complex::Complex(double a,double b)

{

    real=a;

    imaginary=b;

}

Complex::Complex(Complex &p)

{real=p.real;

    imaginary=p.imaginary;

}

void Complex::add(Complex c1)

{real=real+c1.real;

    imaginary=imaginary+c1.imaginary;

}

void Complex::show()

{cout<<real<<"+"<<imaginary<<"i"<<endl;}

double Complex::mod()

{

   return (real*real+imaginary*imaginary);

}

int main(int argc, const char * argv[]) {

    Complex c1(,);

    cout<<"c1=";

    c1.show();

    cout<<"|c1|="<<c1.mod()<<endl;

    Complex c2(4.5);

    cout<<"c2=";

    c2.show();

    cout<<"c1+c2=";

    c1.add(c2);

    c2.show();

    return ;