程序代码：

#include<iostream>
using namespace std;

class Complex
{
private:
     double real;
     double image;
public:
     Complex();            //无参构造函数
     Complex(double r );      //转换构造函数
     Complex(double r, double i);//有两个形参的构造函数
     friend Complex operator+(Complex&a, Complex&b);  //对"+"运算符进行重载
     friend ostream& operator<<(ostream&output, Complex&c);  //对"<<"运算符进行重载
     friend istream& operator>>(istream&input, Complex&c);   //对">>"运算符进行重载
};
Complex::Complex()
{
    real=0;
    image=0;
}
Complex::Complex(double r)
{
    real=r;
    image=0;
}
Complex::Complex(double r,double i)
{
    real=r;
    image=i;
}
Complex operator+(Complex&a,Complex&b)
{
    return Complex(a.real+b.real,a.image+b.image);
}
ostream & operator<<(ostream output,Complex& c)
{
    output<<c.real<<','<<c.image<<'i'<<endl;
    return output;
}
istream & operator>>(istream input,Complex& c)
{
    input>>c.real>>','>>c.image;
    return input;
}
int main()
{
    Complex c1;
    Complex c2;
    Complex c3;
    cin>>c1;
    cin>>c2;
    c3=c1+c2;
    cout<<c3;
}