全局函数pk成员函数

#include <iostream>using namespace std;class Test{public:Test(int a = 0,int b = 0){this->a = a;this->b = b;}~Test(){cout<<"析构函数"<<endl;}Test addTest1(Test &obj){Test tmp(this->a+obj.a,this->b+obj.b);return tmp;}void print(){cout<<"a:"<<a<<"b:"<<b<<endl;}Test& addTest3(Test &obj){this->a = this->a + obj.a;this->b = this->b + obj.b;return *this;}protected:public:int a;int b;};//全局函数Test addTest2(Test &a,Test &b){Test tmp(a.a+b.a,a.b+b.b);return tmp;}void display1(){Test t1(1,2);Test t2(3,4);Test t3;t3 = addTest2(t1,t2);t3.print();}void display2(){Test t1(1,2);Test t2(3,4);Test t3 ;t3 = t1.addTest1(t2);t3.print();}void display3(){Test t1(1,2);Test t2(5,6) ;t2 = t2.addTest3(t1);t2.print();}int main(){display3();system("pause");return 0;}