类与对象编程题2（C++程序设计第3周）

#include <iostream>
using namespace std;
class Sample{
public:
int v;
Sample(int n):v(n) { }
// 在此处补充你的代码
};
int main() {
Sample a(5);
Sample b = a;
cout << b.v;
return 0;
}

10

#include <iostream>
using namespace std;

class Sample
{
public:
int v;
Sample(int n):v(n) {}
Sample(Sample& a)
{
v = 2 * a.v;
}
};
int main()
{
Sample a(5);
Sample b = a;
cout << b.v;
return 0;
}