有如下程序： #include using namespace std; class Amount ｛ int amount; public: Amount(int n=0): amount(n)｛ ｝ int getAmount()const｛ retu

题目：有如下程序： #include using namespace std; class Amount ｛ int amount; public: Amount(int n=0): amount(n)｛ ｝ int getAmount()const｛ return amount; ｝ Amount &operator +=(Amount a) ｛ amount+=a.amount; return ( ); ｝ ｝; int main() ｛ Amount x(3),y(7); x+=y; cout<

A. *this

B. this

C. &amount

D. amount

答案：评论后可见此内容