定义一个Sample类

#include<iostream>using namespace std;class Sample{ public:int n;Sample(int x):n(x){}Sample(){n=20;}friend int add(Sample s1,Sample s2);};int add(Sample s1,Sample s2){ return s1.n+s2.n;};int main(){ Sample sam1,sam2;cout<<add(sam1,sam2)<<endl;}

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