有如下类声明: class Base{ protected: int amount; public: Base(int n=0):amount(n){} in
有如下类声明: class Base{ protected: int amount; public: Base(int n=0):amount(n){} int getAmountconst{retum amount;} }; class Derived:public Base{ protected: int value; public: Derived(int m,int n):value(m),Base(n){} int getDataconst{return value+amount;} }: 已知x是一个Derived对象,则下列表达式中正确的是()。
A.x.value+X.getAmount
B.x.getData一x.getAmount
C.x.getData一x.amount
D.x.value+X.amount