c++重载输入输出运算符

1 最好打断点看看哦

2例子

 #include <iostream>

 using namespace std;

 class Complex2

 {

 public:

     Complex2(float x = , float y = )

         :_x(x), _y(y){

     }

     void dis()

     {

         cout << "(" << _x << "," << _y << ")" << endl;

     }

     friend  ostream & operator<<(ostream  &os, const Complex2 &c);

     friend  istream & operator>>(istream  &is, Complex2 &c);

 private:

     float _x;

     float _y;

 };

 ostream &operator<<(ostream  &os, const Complex2 &c)

 {

     os << "(" << c._x << "," << c._y << ")";

     return os;

 }

 istream & operator>>(istream  &is, Complex2 &c)

 {

     is >> c._x >> c._y;

     return is;

 }

 int main()

 {

     Complex2 c(, );

     cout << c << endl;

     cin >> c;

     cout << c << endl;

     cin.get();

     return ;

 }