第十二周—阅读程序（2）

#include <iostream>using namespace std;class Sample{private:    int x;public:    Sample() {}    Sample (int a){x=a;}    void disp(){cout<<"x="<<x<<endl;}    Sample operator+(const Sample &s);   //成员函数};Sample Sample:: operator+(const Sample &s)//运算符+的重载{    return Sample(x+s.x);}int main(){    Sample obj1(20);    Sample obj2(20);    Sample obj3;    obj3=obj1+obj2;    obj3.disp();    return 0;}

运行结果：