有如下程序: #include <iostream.h> using namespace std; class Base { public: Base(){ cout<<"BB"; f(); } voidf(){cout <<"Bf"; } }; class Derived: public Base { public: Derived (){cout<<"DD";} void f(){cout<<"Df";} }; int main(){Derived d; return 0;} 执行上面的程序将输出
A.BBBfDD
B.BBDfDDDf
C.DD
D.DDBBBf