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 ;
 }