流操作运算符（二）

output管一个复数的输出，return之后再输出其它的复数
input同理

#include <iostream>
using namespace std;class Complex {public:friend ostream & operator << (ostream &,Complex);friend istream & operator >> (istream &,Complex &);private:double real,imag;
};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<<c2;return 0;
}