题目内容

有如下程序：#include using namespace std;class Base{private:void fun1() const { cout<<"fun1"; }protected:void fun2() const { cout<<"fun2"; }public:void fun3() const { cout<<"fun3"; }};class Derived: protected Base{public:void fun4() const { cout<<"fun4"; }};int main(){Derived obj;obj.fun1() ; //①obj.fun2() ; //②obj.fun3(); //③obj.fun4() ; //④return 0;}其中有语法错误的语句是()。

A. ② ③ ④
B. ① ② ③ ④
C. ① ② ③
D. ① ④

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有如下程序：#include using namespace std;class A{public:A(){cout<<"A";}~A(){cout<<"~A";}};class B:public A{A*p;public:B(){ cout<<"B";p=new A(); }~B(){ cout<<"~B";delete p; }};int main(){B obj;return 0;}执行这个程序的输出结果是( )。

ABA～B～A～A
BAA～A～B～A
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有如下程序：#include using namespace std;class Base{public:void fun(){cout<<"Base::fun"<

A. Base::fun();
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有如下程序：#include using namespace std;class BASE{public:~BASE(){cout<<"BASE";}};class DERIVED:public BASE{public:~DERIVED(){cout<<"DERIVED";}};int main(){DERIVED x;return 0;}执行后的输出结果是()。

A. DERIVEDBASE
BASE
C. DERIVED
D. BASEDERIVED

有如下程序：#include using namespace std;class A{public:A(){cout<<"A";}};class B{public:B(){cout<<"B";}};class C:public A{B b;public:C(){cout<<"C";}};int main(){C obj; return 0;}执行后的输出结果是()。

ABC
B. CBA
C. BAC
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