第二周测验 002:奇怪的类复制

<dl class="problem&#45;params" style="color&#58;rgb&#40;35&#44;31&#44;23&#41;&#59;font&#45;family&#58;&#39;Lucida Grande&#39;&#44; Verdana&#44; &#39;Bitstream Vera Sans&#39;&#44; Arial&#44; sans&#45;serif&#59;font&#45;size&#58;14px&#59;"> <dt> 总时间限制:  </dt> <dd style="margin&#45;left&#58;0px&#59;"> 1000ms </dd> <dt> 内存限制:  </dt> <dd style="margin&#45;left&#58;0px&#59;"> 65536kB </dd> </dl> <dl class="problem&#45;content" style="color&#58;rgb&#40;35&#44;31&#44;23&#41;&#59;font&#45;family&#58;&#39;Lucida Grande&#39;&#44; Verdana&#44; &#39;Bitstream Vera Sans&#39;&#44; Arial&#44; sans&#45;serif&#59;font&#45;size&#58;14px&#59;"> <dt style="font&#45;size&#58;16px&#59;line&#45;height&#58;56px&#59;"> 描述 </dt> <dd style="margin&#45;left&#58;0px&#59;">

程序填空，使其输出9 22 5

</dd> <dd style="margin&#45;left&#58;0px&#59;">

#include <iostream>
using namespace std;
class Sample {
public:
	int v;

</dd> </dl>

// 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;
}

输入无输出9
22
5样例输入

None

样例输出

9
22

完整代码：
#include <iostream>
using namespace std;
class Sample
{
public:
    int v;
    Sample(int n=0)
    {
        v=n;
    }
    Sample(const Sample &x)
    {
        v=x.v+2;
    }
};
void PrintAndDouble(Sample a)
{
    cout << a.v;
    cout << endl;
}
int main()
{
    Sample a(5);
    Sample b = a;
    PrintAndDouble(b);

    Sample c = 20;
    PrintAndDouble(c);

    Sample d;
    d = a;
    PrintAndDouble(d);
    return 0;
}