C++ Object-Oriented Programming 006: Strange Class Copy---- (Beijing University Mooc)

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Original title

#include <iostream>
using namespace std;
class Sample {
    
    
public:
	int v;
// 在此处补充你的代码
};
void PrintAndDouble(Sample o)
{
    
    
	cout << o.v;
	cout << endl;
}
int main()
{
    
    
	Sample a(5);
	Sample b = a;
	PrintAndDouble(b);
	Sample c = 20;
	PrintAndDouble(c);
	Sample d;
	d = a;
	cout << d.v;
	return 0;
}

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Code

    Sample(const Sample & a)
    {
    
    
        v = (a.v+2);
    }
    Sample(int a)
    {
    
    
        v = a;
    }
    Sample()
    {
    
    
        v = 22;
    }