重载流插入/流提取运算符

#include <iostream>
using namespace std;

//重载流插入/流提取运算符

class Complex
{
public:
    friend ostream& operator <<(ostream&, Complex&);
    friend istream& operator >> (istream&, Complex&);


private:
    double real;
    double imag;
};

ostream& operator <<(ostream& output, Complex &c)
{
    output << "(" << c.real;
    if (c.imag >= 0)//判断输入
        output << "+";
     output<< 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;
}