c++ 重载<<>>运算符

怎样重载<<  >>运算符？
最好能详细点，有代码的
谢谢各位了

答案：ostream& operator << (ostream& ,自定义的类 &)
istream& operator >> (ostream& ,自定义的类 &) 
    这样实现你自己定义的输入输出流
 
例子：（不是我写的，是以前看谭浩强书上的）
#include <iostream>
using namespace std;
class Complex
 {public:
   Complex(){real=0;imag=0;}
   Complex(double r,double i){real=r;imag=i;}
   Complex operator + (Complex &c2);
   friend ostream& operator << (ostream&,Complex&);
  private:
   double real;
   double imag;
 };
Complex Complex::operator + (Complex &c2)
 {return Complex(real+c2.real,imag+c2.imag);}
   
ostream& operator << (ostream& output,Complex& c)
{output<<"("<<c.real<<"+"<<c.imag<<"i)"<<endl;
 return output;
}
int  main()
{Complex c1(2,4),c2(6,10),c3;
 c3=c1+c2;
 cout<<c3;
 return 0;
}
 
应该是看的明白吧
#include <iostream>
using namespace std;
struct tuple {int a,b,c;};
ostream& operator<<(ostream& os, tuple& t)
{
 os << t.a << ' ' << t.b << ' ' << t.c;
 return os;
}
istream& operator>>(istream& is, tuple& t)
{
 is >> t.a >> t.b >> t.c;
 return is;
}
int main()
{
 tuple t;
 cin >> t;
 cout << t;
}

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