重载流提取运算符

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
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<<"+"<<c.imag<<"i)";
    return output;
}

istream& operator >>(istream&input,Complex&c)
{
    cout<<"input real part and imaginary part of complex number:";
    input>>c.real>>c.imag;
    return input;
}
int main(int argc, char** argv) {
    Complex c1,c2;
    cin>>c1>>c2;
    cout<<"c1="<<c1<<endl;
    cout<<"c2="<<c2<<endl;
    return 0;
}