重载读入读写运算

//举例
struct Patient
{
	string name;
	int order;
	
	bool operator <( const Patient &a )const
	{
		return order < a.order;	
	} 
	
};

istream& operator >>( istream& is,Patient &patient )
{
	is>>patient.name>>patient.order;
    return is;
}

ostream& operator <<( ostream& os,const Patient &patient )
{
    os<<patient.name<<" "<<patient.order<<"\n";
    return os;
}