分析一下这段程序的输出（Autodesk)class B{public:B（){cout$amp;<amp;<quot;$default constructor"&l

class B

{

public:

B()

{

cout$amp;}

~B()

{

cout$amp;}

B(int i):data(i) //B(int) works as a converter (int ->

instance of B)

{

cout$amp;}

private:

int data;

};

B Play(B b)

{

return b ;

}