#include<iostream>

 using namespace std;

 class Test {

 public:

     Test(int a=, int b=)

     {

         this->a = a;

         this->b = b;

     }

     Test & add_menber(Test &t2)

     {

         this->a += t2.a;

         this->b += t2.b;

         return *this;

     }

     void printf(Test &t)

     {

         cout << "a="<<t.a << "b=" << t.b << endl;

     }

     ~Test()

     {

     }

 //private://全局函数如果不是友元函数不能访问私有属性

     int a;

     int b;

 };

 Test add(Test &t1, Test &t2)

 {

     Test temp;

     temp.a= t1.a + t2.a;

     temp.b = t1.b + t2.b;

     return  temp;

 }

 int main()

 {

     Test t1(, ), t2(, ), t3;

     t3 = add(t1, t2);

     cout << "t3.a="<<t3.a<<"t3.b="<<t3.b << endl;

     Test t4(, ),t5(,);

     t4.printf(t4.add_menber(t5));

     cout << "hello world!\n";

     return ;

 }