#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;
}

先上我以前写过的类似的问题

#include<iostream>
using namespace std;

class Complex
{
public:
    Complex();
    Complex(int r,int i);

    void put();
    Complex operator+(Complex &t);
    friend ostream& operator<<(ostream& output,Complex c);
    friend istream& operator>>(istream& input,Complex& c);

private:
    int real;
    int imag;
};

Complex::Complex()
{
    real=0;
    imag=0;
}

Complex::Complex(int r,int i)
{
    real=r;
    imag=i;
}

Complex Complex::operator+(Complex &t)
{
    Complex temp(*this);

    temp.real+=t.real;
    temp.imag+=t.imag;

    return temp;
}

void Complex::put()
{
    cout<<real<<"+"<<imag<<"i"<<endl;
}

ostream& operator<<(ostream& output,Complex c)
{
    output<<"("<<c.real<<"+"<<c.imag<<"i)"<<endl;

    return output;
}

istream& operator>>(istream& input,Complex& c)
{
    input>>c.real>>c.imag;

    return input;
}

int main()
{
    Complex c1,c2;
    cin>>c1>>c2;

    cout<<"c1="<<c1<<endl;
    cout<<"c2="<<c2<<endl;

    return 0;
}

再说楼主的错误：

重载函数写的时候要写成&output和&input

而不是没有&那样子

另外output的时候，c的前面可以不用&


另外，目测还有其他错误，容我再看看

感觉上好像楼主写的+重载不是那么回事儿，

可以参考一下我写的

我就不具体说 了

不好意思，水了。。。一个是&那个问题，还有个重载>>时的错误，就这两个地方报了17个错误，当时就吓尿了。。。