问题
单项选择题
有如下程序：#include＜iostream＞using namespace std;class Base{pubfic:Base(){cout＜＜"BB";f();}void f(){cout＜＜"Bf":}};class Derived:public Base{public:Derived(){cout＜＜"DD";)voidf(){cout＜＜"Df":}};intmain(){Derived d;retum 0;} 执行上面的程序将输出
A．BBBfDD
B．BBDfDDDf
C．DD
D．DDBBBf
答案
参考答案：A