大一第二学期第6周【程序阅读（3）】

#include <iostream>
using namespace std;
class B
{
public:
    B()
    {
        cout<<"default constructor"<<endl;
    }
    ~B()
    {
        cout<<"destructed"<<endl;
    }
    B(int i):data(i)
    {
        cout<<"constructed: " << data <<endl;
    }
private:
    int data;
};
B Play(B b)
{
    return b ;
}
int main()
{
    B temp = Play(5);
    return 0;
}