c++答案求解

Question

#include <iostream>using namespace std;class CBase{public:CBase(int a):a(a){}protected:void print(){cout<<"a="<<a<<endl;}private:int a;};class CDerive : public CBase{public:void print(){CBase::print();cout<<"b="<<b<<endl;}private:int b;}; void main(){CDerive d;d.print();CBase b;b.print();}错误地方

Answer 1

protected的函数不能被对象直接调用吧