第十二周阅读程序（2）

问题及代码：

#include <iostream>using namespace std;class Sample{private:    int x;public:    Sample() {}   //1    Sample (int a){x=a;}  //2    void disp(){cout<<"x="<<x<<endl;}   //3    Sample operator+(Sample &s);    //4};Sample Sample:: operator+( Sample &s){    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：

运行过程：

//运行过程：22143