第八周上机项目 阅读程序

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#include <iostream>using namespace std;class Sample{private:    int x;public:    Sample () { }    Sample(int a){x=a;}    void disp(){cout<<"x="<<x<<endl;}    friend Sample operator+( Sample &s1, Sample &s2);};Sample operator+( Sample &s1, Sample &s2){    return Sample(s1.x+s2.x);}int main(){    Sample obj1(10);    Sample obj2(20);    Sample obj3;    obj3=obj1+obj2;    obj3.disp();    return 0;}